ENGINE PERFORMANCE – Chevrolet Express 2500 LT 2014 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

4.8L VIN A

4.8L VIN A, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Express 2500 LT 2014

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (1 of 5) for Chevrolet Express 2500 LT 2014:

• (5.3l)
• (cutaway: in chassis harness, 87 cm from ebcm connector breakout) (passenger/cargo: in chassis harness, 44 cm from ebcm connector breakout)
• (in engine harness, 16 cm from underhood fuse block x1 breakout) j123
• (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 1 sensor 2
• (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 2 sensor 2
• (in instrument panel harness, 5 cm from x200 breakout towards instrument panel cluster) j231
• (or pnk)
• 5.3l
• 5v ref 1
• 5v ref 2
• A/c refrigerant pressure sensor
• Acc ser data
• Accelerator pedal position (app) sensor (under left side of dash)
• Anti-lock brakes system
• App sens 1 sig
• App sens 2 sig
• Batt pos volt
• Brake pedal position (bpp) sensor (top of brake pedal assembly)
• Brk sens sig
• Brk sens sply
• Brk sw fuse 13 10a
• Comp sens sig
• Computer data lines system
• Cutaway
• Ecm batt fuse 19 10a
• Ecm ign/ glow plug mdl ign fuse 30 15a
• Ect sens sig
• Engine control module (ecm)
• Except 5.3l
• Exterior lights system
• Fuel level sens
• Fuel pump & sender assembly (on fuel tank)
• Fuel tank pressure (ftp) sensor (on fuel tank)
• G103 (on right rear of engine)
• Gmlan data+
• Gmlan data-
• Ho2s hi sig
• Ho2s lo sig
• Hot at all times
• Hot w/ run/ crnk relay 15 energized
• Iat sens sig
• Ign volt
• J101
• J301
• Low ref
• Maf sens sig
• Mass air flow (maf)/intake air temperature (iat) sensor (attached to air intake duct)
• Park/neutral sig
• Pnk
• Press sens sig
• Pwrtrn rly ctrl
• Relay ctrl
• Start rly ctrl
• Starting/ charging system
• Stop lamp switch (behind left side of dash, above brake pedal)
• Tan
• Tcc brake sig
• Transmissions system
• Underhood fuse block (on left side of engine compt)
• Vss
• X100
• X101
• X103
• X128
• X221

4.8L VIN A, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Express 2500 LT 2014

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (2 of 5) for Chevrolet Express 2500 LT 2014:

• (on left rear of engine) g102
• (on right rear of engine) g103
• (or pnk)
• 4.8l
• 5.3l
• Air conditioning system
• Clutch rly ctrl
• Cnstr vent sol fuse 56 10a
• Computer data lines system
• Driver information center display
• Ecm pwr/trn fuse 78 10a
• Engine control module (ecm)
• Engine coolant radiator temperature sensors
• Evap sol ctrl
• Evaporative emission (evap) canister vent solenoid (near front of fuel tank)
• Even ign/ inj fuse 79 20a
• Flex fuel fuse 15a
• Fuel pump relay 38 (4.8l)
• G400 (on inner left rear frame rail)
• Gas fuel pump fuse 24 30a
• Gmlan ser data
• Gnd
• Ho2s hi sig
• Ho2s lo ctrl
• Hot at all times
• Ic 1 ctrl
• Ic 2 ctrl
• Ic 3 ctrl
• Ic 4 ctrl
• Ic 5 ctrl
• Ic 6 ctrl
• Ic 7 ctrl
• Ic 8 ctrl
• Instrument cluster
• J101
• J102
• Lo spd
• Logic
• Low engine oil pressure ind
• Low ref
• Maf/ cnstr vent fuse 64 15a
• Malfunction indicator lamp
• Mil ctrl
• O2 snsr 1 (pre)/cls fuse 77 10a
• O2 snsr 2 (post) fuse 62 10a
• Odd ign/inj fuse 65 20a
• Pnk
• Pwr/trn relay 49
• Tan
• Tos sig
• Transmissions system
• Underhood fuse block (on left side of engine compt)
• X100
• X101
• X127
• X150

4.8L VIN A, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Express 2500 LT 2014

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (3 of 5) for Chevrolet Express 2500 LT 2014:

• (at rear of vehicle, attached to left rear frame rail) (5.3l) fuel pump flow control module
• (at top left of engine)
• (in odd ignition/coil module jumper harness, on top left side of engine)
• 5v ref
• Body control module (behind lower right side of dash)
• Brake lo ref
• Brake sens sig
• Computer data lines system
• Fcsm batt fuse 36 20a
• Fscm ign fuse 6 10a
• G102 (on left rear of engine)
• G300 (on left frame rail, near ebcm)
• Gmlan data +
• Gmlan data -
• Gnd
• Hot at all times
• Hot w/ run/ crnk relay 15 energized
• Ign volt
• Ignition coil/module 1
• Ignition coil/module 3
• Ignition coil/module 5
• Ignition coil/module 7
• J102
• J182
• J184 (in odd ignition/coil module jumper harness, on top left side of engine)
• J187
• J315
• Low ref
• Nca
• Pnk
• Pnk d
• Pump ctrl
• Red c
• Relay ctrl
• Sens sig
• Serial data
• Spark plug
• Tan
• Underhood fuse block (on left side of engine compt)
• X126

4.8L VIN A, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Express 2500 LT 2014

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (4 of 5) for Chevrolet Express 2500 LT 2014:

• (at top right of engine)
• (in even ignition/coil module jumper harness, on top right side of engine)
• (in even ignition/coil module jumper harness, on top right side of engine) j183
• (on left side of intake manifold)
• (on right side of intake manifold)
• C10
• Engine oil pressure (eop) sensor (on top rear of engine)
• Fuel composition sensor
• Fuel injector 1
• Fuel injector 2
• Fuel injector 3
• Fuel injector 4
• Fuel injector 5
• Fuel injector 6
• Fuel injector 7
• Fuel injector 8
• Fuel rail pressure (fpr) sensor
• G102 (on left rear of engine)
• G103 (on right rear of engine)
• Ignition coil/module 2
• Ignition coil/module 4
• Ignition coil/module 6
• Ignition coil/module 8
• J101
• J102
• J185
• J188
• Nca
• Pnk
• Pnk d
• Red c
• Spark plug
• Tan
• X101
• X127

4.8L VIN A, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Express 2500 LT 2014

List of elements for 4.8L VIN A, Engine Performance Wiring Diagram (5 of 5) for Chevrolet Express 2500 LT 2014:

• (on top of engine, near throttle body) evaporative emission (evap) canister purge solenoid valve
• 5v ref 1
• 5v ref 2
• Camshaft position (cmp) sensor (front of engine)
• Cen field sig
• Ckp sens sig
• Cmp sens sig
• Crankshaft position (ckp) sensor (on lower right rear of engine, near starter motor)
• Ect sens sig
• Engine control module (ecm)
• Engine coolant temperature (ect) sensor (at left front of engine)
• Gen on sig
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (in exhaust pipe, in front of catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (in exhaust pipe, in front of catalytic converter)
• Ho2s hi sig
• Ho2s lo ctrl
• Ho2s lo sig
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• Knock sensor (ks) 1
• Knock sensor (ks) 2
• Ks 1 sig
• Ks 2 sig
• Low ref
• Manifold absolute pressure (map) sensor (at top rear of engine, on intake manifold)
• Map sens sig
• Pnk
• Pnk d
• Pre sens sig
• Sol ctrl
• Starting/ charging system
• Starting/charging system
• Tac mtr ctrl 1
• Tac mtr ctrl 2
• Tan
• Tan a
• Throttle body
• Tp sens 1 sig
• Tp sens 2 sig
• X177

6.0L VIN B

6.0L VIN B, Engine Performance Wiring Diagram (1 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN B, Engine Performance Wiring Diagram (1 of 7) for Chevrolet Express 2500 LT 2014:

• (at left front of engine)
• (cutaway: in chassis harness, 87 cm from ebcm connector breakout) (passenger/cargo: in chassis harness, 44 cm from ebcm connector breakout)
• (in engine harness, 16 cm from underhood fuse block x1 breakout) j123
• (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 1 sensor 2
• (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 2 sensor 2
• (in instrument panel harness, 5 cm from x200 breakout towards instrument panel cluster)
• (on inner left rear frame rail)
• (or 6049)
• 5v ref 1
• 5v ref 2
• 6.0l vin b
• 6.0l vin g 6.0l vin b
• A/c refrigerant pressure sensor
• Acc ser data
• Accelerator pedal position (app) sensor (under left side of dash)
• Anti-lock brakes system
• App sens 1 sig
• App sens 2 sig
• Batt pos volt
• Brake pedal position (bpp) sensor (top of brake pedal assembly)
• Brk sens sig
• Brk sens sply
• Brk sw fuse 10a
• Cng fuel vehicle
• Computer data lines system
• Cutaway
• Ecm batt fuse 10a
• Ecm ign/ glow plug mdl ign fuse 15a
• Ect sens sig
• Engine control module (ecm) (left side of engine compt)
• Engine coolant radiator temperature sensor
• Exterior lights system
• Fuel level sens
• Fuel pump & sender assembly (on fuel tank)
• Fuel tank pressure (ftp) sensor (on fuel tank)
• G103 (on right rear of engine)
• G400
• Gmlan data+
• Gmlan data-
• Ho2s hi sig
• Ho2s lo sig
• Hot at all times
• Hot w/ run/ crank relay 15 energized
• Iat sens sig
• Ign volt
• J101
• J231
• J301
• J402
• Low ref
• Lpg fuel vehicle w/ 3 tank
• Lpg fuel vehicle w/ 4 tank
• Maf sens sig
• Mass air flow (maf)/intake air temperature (iat) sensor (attached to air intake duct)
• Park/neutral sig
• Pnk
• Press sens sig
• Pwrtrn rly ctrl
• Relay ctrl
• Start rly ctrl
• Starting/ charging system
• Stop lamp switch (behind left side of dash, above brake pedal)
• Tan
• Tan c
• Tcc brake sig
• Transmissions system
• Underhood fuse block (on left side of engine compt)
• Vss
• X100
• X101
• X103
• X128
• X150
• X221
• X350

6.0L VIN B, Engine Performance Wiring Diagram (2 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN B, Engine Performance Wiring Diagram (2 of 7) for Chevrolet Express 2500 LT 2014:

• (on right rear of engine) g103
• (on right side of intake manifold)
• (or red) pnk
• Clutch rly ctrl
• Cnstr vent sol fuse 10a
• Computer data lines system
• Ecm pwr/trn fuse 10a
• Engine control module (ecm) (left side of engine compt)
• Engine controls ignition relay
• Evap sol ctrl
• Evaporative emission vent solenoid (near front of fuel tank)
• Even ign/ inj fuse 20a
• Flex fuel fuse 15a
• Fuel injector 2
• Fuel injector 4
• Gnd
• Ho2s hi sig
• Ho2s lo ctrl
• Hot at all times
• Ic 1 ctrl
• Ic 2 ctrl
• Ic 3 ctrl
• Ic 4 ctrl
• Ic 5 ctrl
• Ic 6 ctrl
• Ic 7 ctrl
• Ic 8 ctrl
• Instrument panel cluster (ipc)
• J101
• Logic
• Low engine oil pressure ind
• Low ref
• Maf/ cnstr vent fuse 15a
• Malfunction indicator lamp (mil)
• Mil
• Mil ctrl
• O2 snsr 1 (pre)/ cls fuse 10a
• O2 snsr 2 (post) fuse 10a
• Odd ign/inj fuse 20a
• Pnk
• Pnk (or red)
• Tos sig
• Transmissions system air conditioning system
• Underhood fuse block (on left side of engine compt)
• W/ 3 tank
• W/ 4 tank
• X100
• X101
• X127
• X162
• X164

6.0L VIN B, Engine Performance Wiring Diagram (3 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN B, Engine Performance Wiring Diagram (3 of 7) for Chevrolet Express 2500 LT 2014:

• (at top left of engine)
• (forward of left rear spring on frame) cng control module
• (in odd ignition/coil module jumper harness, on top left side of engine)
• (left rear of axle between frame rails)
• (not used)
• (on left side of intake manifold)
• (or red) pnk
• 12v
• 5 volt ref
• Alternative fuel tank pressure sensor
• C10
• Cng cutt-off solenoid valve 2
• Cng cutt-off solenoid valve 3
• Cng sol vlv ctrl
• Fuel composition sensor
• Fuel injector 3
• Fuel injector 7
• G102 (on left rear of engine)
• G103 (on right rear of engine)
• G350 (rear of transmission case)
• G400 (on inner left rear frame rail)
• Gnd
• Ignition coil 1
• Ignition coil 3
• Ignition coil 5
• Ignition coil 7
• J101
• J102
• J182
• J184 (in odd ignition/coil module jumper harness, on top left side of engine)
• Low ref
• Nca
• Pnk
• Pnk d
• Pressure sig
• Red
• Red c
• Sensing
• Spark plug
• W/ 3 tank
• W/ 4 tank
• X101
• X126
• X163
• X167
• X350

6.0L VIN B, Engine Performance Wiring Diagram (4 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN B, Engine Performance Wiring Diagram (4 of 7) for Chevrolet Express 2500 LT 2014:

• (at top right of engine)
• (front of cng control module near ebcm) cng high pressure regulator solenoid valve
• (inboard side of left frame rail near ebcm) cng cutt-off solenoid valve 1
• (left rear of axle between frame rails) cng cutt-off solenoid valve 4
• Fuel pump relay
• G102 (on left rear of engine)
• G400 (on inner left rear frame rail)
• Gas fuel pump fuse 30a
• Hot at all times
• Ignition coil 2
• Ignition coil 4
• Ignition coil 6
• Ignition coil 8
• J102
• J183
• J185
• J188 (in even ignition/coil module jumper harness, on top right side of engine)
• J362
• Mega fuse 125a
• Natural gas
• Nca
• Pnk
• Pnk d
• Rear lpg cut-off solenoid valve
• Red
• Red c
• Regular gas
• Regular gas w/ 3 tank
• Regular gas w/ 4 tank
• Secondary fuel pump
• Secondary lpg pump assembly
• Spark plug
• Underhood fuse block (on left side of engine compt)
• X127

6.0L VIN B, Engine Performance Wiring Diagram (5 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN B, Engine Performance Wiring Diagram (5 of 7) for Chevrolet Express 2500 LT 2014:

• (in lpg tank control box) (regular gas w/ 4 tank) fuel pump relay
• (in lpg tank control box) (regular gas w/ 4 tank) lpg tank scavenge pump relay
• (in lpg tank control box) (regular gas w/ 4 tank) secondary fuel pump relay
• 12 volt ref
• Batt pos volt
• C (not used)
• Front lpg cut-off solenoid valve
• Fuel gauge sig
• Fuse holder (regular gas w/ 3 tank)
• Fuse holder (regular gas w/ 4 tank)
• G110 (lower left front of engine)
• G400 (on inner left rear frame rail)
• Gnd
• J361
• J362
• J364
• J365 red
• J366
• J367 red
• J368
• Lpcm fuse 20a
• Lpcm fuse 30a
• Lpg control module (regular gas w/ 4 tank) (on tank control box)
• Lpg pressure & temperature sensor
• Lpg purge sole- noid valve
• Lpg tank scavenge pump
• Pnk
• Primary fuel pump
• Primary lpg pump assembly
• Primary sig
• Pump sig
• Red
• Red j363
• Rly sig
• Secondary sig
• Strt lmp
• W/ 3 tank
• W/ 4 tank
• Wait to start indicator
• X350

6.0L VIN B, Engine Performance Wiring Diagram (6 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN B, Engine Performance Wiring Diagram (6 of 7) for Chevrolet Express 2500 LT 2014:

• (in lpg fuel tank harness, 152.5 mm from x180)
• (next to brake booster taped to harness) (regular gas w/ 3 tank) wait to start indicator relay
• (on fuel tank) (regular gas w/ 3 tank) lpg bypass solenoid valve
• (on left front of engine compt)
• (on left side of intake manifold)
• (on right side of intake manifold)
• (regular gas w/ 3 tank) lpg bypass solenoid valve relay
• (regular gas w/ 3 tank) wait to start indicator
• 5 volt ref
• Batt pos vlt
• Engine oil pressure (eop) sensor (on top rear of engine)
• Evaporative emission system leak detection pump
• Fuel cutoff solenoid valve
• Fuel injector 1
• Fuel injector 5
• Fuel injector 6
• Fuel injector 8
• Fuel injector control module
• Fuel pump
• Fuel temp sig
• G100
• G100 (on left front of engine compt)
• G110 (lower left front of engine)
• G400 (on inner left rear frame rail)
• J167
• J168
• J169
• J170
• J171
• J172
• J176
• J179
• J368
• J430
• J431
• J432
• Pmp sig
• Pnk
• Pnk (or red)
• Press sig
• Primary fuel level sensor (6.0l vin b) (front of primary fuel tank)
• Red
• Rely volt
• Resistor
• Rly sig
• Secondary fuel level sensor (6.0l vin b) (front of secondary fuel tank)
• Sol rly sig
• Tan
• Temp sens
• W/ 3 tank
• W/ 4 tank
• X161
• X165
• X166
• X168
• X180
• X350

6.0L VIN B, Engine Performance Wiring Diagram (7 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN B, Engine Performance Wiring Diagram (7 of 7) for Chevrolet Express 2500 LT 2014:

• (on top of engine, near throttle body) evaporative emission purge solenoid
• 5v ref 1
• 5v ref 2
• Camshaft position (cmp) actuator solenoid valve
• Camshaft position (cmp) sensor (front of engine)
• Cen field sig
• Ckp sens sig
• Cmp sens sig
• Crankshaft position (ckp) sensor (on lower right rear of engine, near starter motor)
• Ect sens sig
• Engine control module (ecm) (left side of engine compt)
• Engine coolant temperature (ect) sensor (at left front of engine)
• Gen on sig
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (in exhaust pipe, in front of catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (in exhaust pipe, in front of catalytic converter)
• Ho2s hi sig
• Ho2s lo ctrl
• Ho2s lo sig
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• Intake sol
• Knock sensor (ks) 1
• Knock sensor (ks) 2
• Ks 1 sig
• Ks 2 sig
• Low ref
• Manifold absolute pressure (map) sensor (at top rear of engine, on intake manifold)
• Map sens sig
• Pnk
• Pnk d
• Pre sens sig
• Sol ctrl
• Starting/ charging system
• Starting/charging system
• Tac mtr ctrl 1
• Tac mtr ctrl 2
• Tan
• Tan a
• Throttle body
• Tp sens 1 sig
• Tp sens 2 sig
• X177

6.0L VIN G

6.0L VIN G, Engine Performance Wiring Diagram (1 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN G, Engine Performance Wiring Diagram (1 of 7) for Chevrolet Express 2500 LT 2014:

• (at left front of engine)
• (cutaway: in chassis harness, 87 cm from ebcm connector breakout) (passenger/cargo: in chassis harness, 44 cm from ebcm connector breakout)
• (in engine harness, 16 cm from underhood fuse block x1 breakout) j123
• (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 1 sensor 2
• (in exhaust pipe, in back of catalytic converter) heated oxygen sensor (ho2s) bank 2 sensor 2
• (in instrument panel harness, 5 cm from x200 breakout towards instrument panel cluster)
• (on inner left rear frame rail)
• (or 6049)
• 5v ref 1
• 5v ref 2
• 6.0l vin b
• 6.0l vin g 6.0l vin b
• A/c refrigerant pressure sensor
• Acc ser data
• Accelerator pedal position (app) sensor (under left side of dash)
• Anti-lock brakes system
• App sens 1 sig
• App sens 2 sig
• Batt pos volt
• Brake pedal position (bpp) sensor (top of brake pedal assembly)
• Brk sens sig
• Brk sens sply
• Brk sw fuse 10a
• Cng fuel vehicle
• Computer data lines system
• Cutaway
• Ecm batt fuse 10a
• Ecm ign/ glow plug mdl ign fuse 15a
• Ect sens sig
• Engine control module (ecm) (left side of engine compt)
• Engine coolant radiator temperature sensor
• Exterior lights system
• Fuel level sens
• Fuel pump & sender assembly (on fuel tank)
• Fuel tank pressure (ftp) sensor (on fuel tank)
• G103 (on right rear of engine)
• G400
• Gmlan data+
• Gmlan data-
• Ho2s hi sig
• Ho2s lo sig
• Hot at all times
• Hot w/ run/ crank relay 15 energized
• Iat sens sig
• Ign volt
• J101
• J231
• J301
• J402
• Low ref
• Lpg fuel vehicle w/ 3 tank
• Lpg fuel vehicle w/ 4 tank
• Maf sens sig
• Mass air flow (maf)/intake air temperature (iat) sensor (attached to air intake duct)
• Park/neutral sig
• Pnk
• Press sens sig
• Pwrtrn rly ctrl
• Relay ctrl
• Start rly ctrl
• Starting/ charging system
• Stop lamp switch (behind left side of dash, above brake pedal)
• Tan
• Tan c
• Tcc brake sig
• Transmissions system
• Underhood fuse block (on left side of engine compt)
• Vss
• X100
• X101
• X103
• X128
• X150
• X221
• X350

6.0L VIN G, Engine Performance Wiring Diagram (2 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN G, Engine Performance Wiring Diagram (2 of 7) for Chevrolet Express 2500 LT 2014:

• (on right rear of engine) g103
• (on right side of intake manifold)
• (or red) pnk
• Clutch rly ctrl
• Cnstr vent sol fuse 10a
• Computer data lines system
• Ecm pwr/trn fuse 10a
• Engine control module (ecm) (left side of engine compt)
• Engine controls ignition relay
• Evap sol ctrl
• Evaporative emission vent solenoid (near front of fuel tank)
• Even ign/ inj fuse 20a
• Flex fuel fuse 15a
• Fuel injector 2
• Fuel injector 4
• Gnd
• Ho2s hi sig
• Ho2s lo ctrl
• Hot at all times
• Ic 1 ctrl
• Ic 2 ctrl
• Ic 3 ctrl
• Ic 4 ctrl
• Ic 5 ctrl
• Ic 6 ctrl
• Ic 7 ctrl
• Ic 8 ctrl
• Instrument panel cluster (ipc)
• J101
• Logic
• Low engine oil pressure ind
• Low ref
• Maf/ cnstr vent fuse 15a
• Malfunction indicator lamp (mil)
• Mil
• Mil ctrl
• O2 snsr 1 (pre)/ cls fuse 10a
• O2 snsr 2 (post) fuse 10a
• Odd ign/inj fuse 20a
• Pnk
• Pnk (or red)
• Tos sig
• Transmissions system air conditioning system
• Underhood fuse block (on left side of engine compt)
• W/ 3 tank
• W/ 4 tank
• X100
• X101
• X127
• X162
• X164

6.0L VIN G, Engine Performance Wiring Diagram (3 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN G, Engine Performance Wiring Diagram (3 of 7) for Chevrolet Express 2500 LT 2014:

• (at top left of engine)
• (forward of left rear spring on frame) cng control module
• (in odd ignition/coil module jumper harness, on top left side of engine)
• (left rear of axle between frame rails)
• (not used)
• (on left side of intake manifold)
• (or red) pnk
• 12v
• 5 volt ref
• Alternative fuel tank pressure sensor
• C10
• Cng cutt-off solenoid valve 2
• Cng cutt-off solenoid valve 3
• Cng sol vlv ctrl
• Fuel composition sensor
• Fuel injector 3
• Fuel injector 7
• G102 (on left rear of engine)
• G103 (on right rear of engine)
• G350 (rear of transmission case)
• G400 (on inner left rear frame rail)
• Gnd
• Ignition coil 1
• Ignition coil 3
• Ignition coil 5
• Ignition coil 7
• J101
• J102
• J182
• J184 (in odd ignition/coil module jumper harness, on top left side of engine)
• Low ref
• Nca
• Pnk
• Pnk d
• Pressure sig
• Red
• Red c
• Sensing
• Spark plug
• W/ 3 tank
• W/ 4 tank
• X101
• X126
• X163
• X167
• X350

6.0L VIN G, Engine Performance Wiring Diagram (4 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN G, Engine Performance Wiring Diagram (4 of 7) for Chevrolet Express 2500 LT 2014:

• (at top right of engine)
• (front of cng control module near ebcm) cng high pressure regulator solenoid valve
• (inboard side of left frame rail near ebcm) cng cutt-off solenoid valve 1
• (left rear of axle between frame rails) cng cutt-off solenoid valve 4
• Fuel pump relay
• G102 (on left rear of engine)
• G400 (on inner left rear frame rail)
• Gas fuel pump fuse 30a
• Hot at all times
• Ignition coil 2
• Ignition coil 4
• Ignition coil 6
• Ignition coil 8
• J102
• J183
• J185
• J188 (in even ignition/coil module jumper harness, on top right side of engine)
• J362
• Mega fuse 125a
• Natural gas
• Nca
• Pnk
• Pnk d
• Rear lpg cut-off solenoid valve
• Red
• Red c
• Regular gas
• Regular gas w/ 3 tank
• Regular gas w/ 4 tank
• Secondary fuel pump
• Secondary lpg pump assembly
• Spark plug
• Underhood fuse block (on left side of engine compt)
• X127

6.0L VIN G, Engine Performance Wiring Diagram (5 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN G, Engine Performance Wiring Diagram (5 of 7) for Chevrolet Express 2500 LT 2014:

• (in lpg tank control box) (regular gas w/ 4 tank) fuel pump relay
• (in lpg tank control box) (regular gas w/ 4 tank) lpg tank scavenge pump relay
• (in lpg tank control box) (regular gas w/ 4 tank) secondary fuel pump relay
• 12 volt ref
• Batt pos volt
• C (not used)
• Front lpg cut-off solenoid valve
• Fuel gauge sig
• Fuse holder (regular gas w/ 3 tank)
• Fuse holder (regular gas w/ 4 tank)
• G110 (lower left front of engine)
• G400 (on inner left rear frame rail)
• Gnd
• J361
• J362
• J364
• J365 red
• J366
• J367 red
• J368
• Lpcm fuse 20a
• Lpcm fuse 30a
• Lpg control module (regular gas w/ 4 tank) (on tank control box)
• Lpg pressure & temperature sensor
• Lpg purge sole- noid valve
• Lpg tank scavenge pump
• Pnk
• Primary fuel pump
• Primary lpg pump assembly
• Primary sig
• Pump sig
• Red
• Red j363
• Rly sig
• Secondary sig
• Strt lmp
• W/ 3 tank
• W/ 4 tank
• Wait to start indicator
• X350

6.0L VIN G, Engine Performance Wiring Diagram (6 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN G, Engine Performance Wiring Diagram (6 of 7) for Chevrolet Express 2500 LT 2014:

• (in lpg fuel tank harness, 152.5 mm from x180)
• (next to brake booster taped to harness) (regular gas w/ 3 tank) wait to start indicator relay
• (on fuel tank) (regular gas w/ 3 tank) lpg bypass solenoid valve
• (on left front of engine compt)
• (on left side of intake manifold)
• (on right side of intake manifold)
• (regular gas w/ 3 tank) lpg bypass solenoid valve relay
• (regular gas w/ 3 tank) wait to start indicator
• 5 volt ref
• Batt pos vlt
• Engine oil pressure (eop) sensor (on top rear of engine)
• Evaporative emission system leak detection pump
• Fuel cutoff solenoid valve
• Fuel injector 1
• Fuel injector 5
• Fuel injector 6
• Fuel injector 8
• Fuel injector control module
• Fuel pump
• Fuel temp sig
• G100
• G100 (on left front of engine compt)
• G110 (lower left front of engine)
• G400 (on inner left rear frame rail)
• J167
• J168
• J169
• J170
• J171
• J172
• J176
• J179
• J368
• J430
• J431
• J432
• Pmp sig
• Pnk
• Pnk (or red)
• Press sig
• Primary fuel level sensor (6.0l vin b) (front of primary fuel tank)
• Red
• Rely volt
• Resistor
• Rly sig
• Secondary fuel level sensor (6.0l vin b) (front of secondary fuel tank)
• Sol rly sig
• Tan
• Temp sens
• W/ 3 tank
• W/ 4 tank
• X161
• X165
• X166
• X168
• X180
• X350

6.0L VIN G, Engine Performance Wiring Diagram (7 of 7) for Chevrolet Express 2500 LT 2014

List of elements for 6.0L VIN G, Engine Performance Wiring Diagram (7 of 7) for Chevrolet Express 2500 LT 2014:

• (on top of engine, near throttle body) evaporative emission purge solenoid
• 5v ref 1
• 5v ref 2
• Camshaft position (cmp) actuator solenoid valve
• Camshaft position (cmp) sensor (front of engine)
• Cen field sig
• Ckp sens sig
• Cmp sens sig
• Crankshaft position (ckp) sensor (on lower right rear of engine, near starter motor)
• Ect sens sig
• Engine control module (ecm) (left side of engine compt)
• Engine coolant temperature (ect) sensor (at left front of engine)
• Gen on sig
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (in exhaust pipe, in front of catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (in exhaust pipe, in front of catalytic converter)
• Ho2s hi sig
• Ho2s lo ctrl
• Ho2s lo sig
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• Intake sol
• Knock sensor (ks) 1
• Knock sensor (ks) 2
• Ks 1 sig
• Ks 2 sig
• Low ref
• Manifold absolute pressure (map) sensor (at top rear of engine, on intake manifold)
• Map sens sig
• Pnk
• Pnk d
• Pre sens sig
• Sol ctrl
• Starting/ charging system
• Starting/charging system
• Tac mtr ctrl 1
• Tac mtr ctrl 2
• Tan
• Tan a
• Throttle body
• Tp sens 1 sig
• Tp sens 2 sig
• X177

6.6L VIN L

6.6L VIN L, Engine Performance Wiring Diagram (1 of 6) for Chevrolet Express 2500 LT 2014

List of elements for 6.6L VIN L, Engine Performance Wiring Diagram (1 of 6) for Chevrolet Express 2500 LT 2014:

• (16 cm from underhood fuse block x1 breakout)
• (5 cm from x200 breakout towards instrument panel cluster)
• (above reductant tank) reductant pressure sensor
• (above reductant tank) reductant purge solenoid valve
• (behind left side of dash, above brake pedal) stop lamp switch
• (cutaway) x101
• (cutaway) x115
• 5 volt ref
• A/c clutch rly ctrl
• Air conditioning system
• Air flow sens sig
• App sig 1
• App sig 2
• Cf ctrl rly spd sig
• Computer data lines system
• Cooling fan spd sig
• Cooling fans system
• Cooling fans system starting/charging system cooling fans system transmissions system
• Cruise/etc/tcc brk sig
• Def smart pump ctrl
• Def valve high ctrl
• Def valve low ctrl
• Duty cycle sig
• Egt sens 2 sig
• Egt sens 3 sig
• Egt sens 4 sig
• Engine control module (ecm)
• Engine indicator ctrl
• Exhaust temperature sensor 2
• Exhaust temperature sensor 3 (middle of diesel particulate filter)
• Exhaust temperature sensor 4
• Exterior lights system
• Fuel level sens
• Fuel pump rly ctrl
• Generator turn on sig
• Ign 1 volt
• Inj high ctrl
• Inj low ctrl
• J123
• J231
• Low ref
• Mass air flow (maf)/intake air temp (iat) sensor (attached to air intake duct)
• Nca
• Park/neutral sig
• Pnk
• Pressure sens sig
• Pressure sens sig 1
• Pump sply volt
• Replicated tos sig
• Rly coil ctrl
• Ser data +
• Ser data -
• Starter enable rly ctrl
• Starting/ charging system
• Starting/charging system
• Tan
• Temp sens sig
• Transmissions system
• Valve low ctrl
• Wait to start ind ctrl
• Wakeup serial data
• X100
• X101
• X174
• X221
• X395

6.6L VIN L, Engine Performance Wiring Diagram (2 of 6) for Chevrolet Express 2500 LT 2014

List of elements for 6.6L VIN L, Engine Performance Wiring Diagram (2 of 6) for Chevrolet Express 2500 LT 2014:

• (above reductant tank) reductant line heater
• (above reductant tank) reductant pump
• (cutaway)
• (near rear of catalytic converter) reductant injector
• (on fuel tank) fuel level sensor
• (right rear side of engine) exhaust aftertreatment fuel injector
• (top left rear side of engine)
• A/c refrigerant pressure sensor
• Accelerator pedal position (app) sensor (under left side of dash)
• B10
• C tan
• C10
• Computer data lines system
• Cutaway
• Driver information center display
• Exhaust pressure differential sensor (attached to upper frame, near diesel oxidizing converter)
• G400 (on inner left rear frame rail)
• Gnd
• Hi spd gmlan ser data +
• Hi spd gmlan ser data -
• Ign volt
• Ind ctrl
• Instrument cluster
• J402
• Logic
• Low engine oil pressure ind
• Malfunction indicator lamp
• Mil ctrl
• Nitrogen oxides sensor 1
• Nitrogen oxides sensor 2 (middle of diesel particulate filter)
• Pnk
• Reductant sensor module (above reductant tank)
• Reductant tank heater
• Sens 1 gnd
• Sens 1 sply volt
• Sens 2 gnd
• Sens 2 sply volt
• Ser data
• Tan
• Wait to start ind
• X100
• X101
• X107
• X115
• X395

6.6L VIN L, Engine Performance Wiring Diagram (3 of 6) for Chevrolet Express 2500 LT 2014

List of elements for 6.6L VIN L, Engine Performance Wiring Diagram (3 of 6) for Chevrolet Express 2500 LT 2014:

• (left center outer frame rail near, secondary battery) g305
• (left rear of engine) glow plug control module (gpcm)
• Auxiliary battery
• Battery
• Charge air cooler inlet temperature sensor (on intake manifold)
• Charge air cooler outlet temperature sensor (near coolant surge tank)
• Computer data lines system
• Fusible link 1
• Fusible link 4
• G104 (right side of engine)
• G109
• G109 (lower right front of engine)
• Glow plugs (1, 3, 5, 7: on right side of engine) (2, 4, 6, 8: on left side of engine)
• Gnd
• Hi spd gmlan ser data +
• Hi spd gmlan ser data -
• Htr ctrl
• Iah comm 1
• Iah comm 2
• Iah current feedback sig
• Iah current sig
• Iah dig sig
• Iah fdbk sig
• Iah heart beat sig
• Iah sw on/off sig
• Iah temp feedback sig
• Iah temp sig
• Iah volt feedback sig
• Iah volt sig
• Ign 1 volt
• Intake air heater (between intake manifold tube & air cooler outlet duct)
• J160
• J162
• Line htr ctrl
• Manifold absolute pressue (map) sensor (attached to intake manifold tube)
• Plug 1 ctrl
• Plug 2 ctrl
• Plug 3 ctrl
• Plug 4 ctrl
• Plug 5 ctrl
• Plug 6 ctrl
• Plug 7 ctrl
• Plug 8 ctrl
• Pnk
• Pnk a
• Power distribution system
• Pump htr ctrl
• Red
• Sens 1 gnd
• Sens 1 sply volt
• Sens 2 gnd
• Sens 2 sply volt
• Starter motor
• Tan
• Underhood junction block
• Wakeup ser data
• X107

6.6L VIN L, Engine Performance Wiring Diagram (4 of 6) for Chevrolet Express 2500 LT 2014

List of elements for 6.6L VIN L, Engine Performance Wiring Diagram (4 of 6) for Chevrolet Express 2500 LT 2014:

• (left side of fuel injection pump) fuel temperature sensor 1
• (on top right side of engine) fuel rail pressure (frp) sensor
• (rear of left fuel rail) fuel temperature sensor 2
• (top of brake pedal assembly) brake pedal position (bpp) sensor
• (top of engine, near thermostat housing) engine coolant temperature (ect) sensor
• 5 volt ref
• Act ctrl close
• Act ctrl open
• B tan
• Brk aply sens sig
• Cac temp sens rtn
• Cac temp sens sig
• Ckp sens sig
• Cmp sens sig
• Ctrl cyl 2
• Ctrl cyl 3
• Ctrl cyl 5
• Ctrl cyl 8
• Ect sens sig
• Egr valve sens sig
• Egrt sens 1 sply volt
• Egrt sens 2 sply volt
• Egrv mtr high sig
• Egrv mtr low sig
• Egt sens 1 sig
• Engine control module (ecm)
• Exhaust temperature sensor 1
• Fuel temp 1 sig
• Fuel temp sig
• G109 (lower right front of engine)
• Gnd
• Intake air flow valve
• J160
• Low ref
• Nca
• Oil pressure sens sig
• Pnk
• Pos sens sig
• Pos sens sig 1
• Pressure sens sig
• Pressure sw sig
• Sens sply volt
• Sply cyl 2
• Sply cyl 3
• Sply cyl 5
• Sply cyl 8
• Tan
• Temp 1 rtn
• Temp sens rtn
• Temp sens sig
• Water in fuel sens sig
• Water in fuel sensor
• X101
• X103
• X107
• X110
• X111
• X112
• X174
• X316

6.6L VIN L, Engine Performance Wiring Diagram (5 of 6) for Chevrolet Express 2500 LT 2014

List of elements for 6.6L VIN L, Engine Performance Wiring Diagram (5 of 6) for Chevrolet Express 2500 LT 2014:

• (behind lower right side of dash) body control module
• (left center inner frame rail) fuel pump
• (on inner left rear frame rail)
• B2 pnk
• B5 pnk
• Brake lo ref
• Brk sw fuse 13 10a
• C1 pnk
• Camshaft position (cmp) sensor (on front of engine)
• Crankshaft position (ckp) sensor (next to crankshaft pulley)
• Diesel fuel pump fuse 24 20a
• Ecm batt fuse 19 10a
• Ecm ign/glow plug mdl ign fuse 30 15a
• Ecm pwr/ trn fuse 45 30a
• Exhaust gas recirculation (egr) temperature sensor 2
• Exhaust gas recirculation (egr) valve (right side of engine above 1 cylinder)
• Fuel filter pressure switch (top left rear side of engine)
• Fuel htr fuse 71 15a
• Fuel injector 2 (on left side of engine)
• Fuel injector 3 (on right side of engine)
• Fuel injector 4 (on left side of engine)
• Fuel injector 5 (on right side of engine)
• Fuel injector 8 (on left side of engine)
• Fuel pump relay
• G102 (left front lower side of engine block)
• G109 (lower right front of engine)
• G111
• G4 pnk
• G400
• Hot at all times
• Hot w/ run/crnk relay 15 energized
• J102
• J161
• J316
• Maf/ cnstr fuse 64 15a
• Nca
• O2 snsr1 (pre)/sls fuse 77 10a
• Pnk
• Pwr/ trn relay
• Sig brake sens
• Tan
• Underhood fuse block (on left side of engine compt)
• X107
• X174
• X316

6.6L VIN L, Engine Performance Wiring Diagram (6 of 6) for Chevrolet Express 2500 LT 2014

List of elements for 6.6L VIN L, Engine Performance Wiring Diagram (6 of 6) for Chevrolet Express 2500 LT 2014:

• (front of left fuel rail) fuel pressure regulator 2
• (lower left front of engine)
• (lower right front of engine)
• (lower right front of engine) g109
• (not used)
• (on inner left rear frame rail)
• (on left side of oil pan) engine oil level switch
• (pins 33-40 not used)
• (pins 42-46 not used)
• (pins 48-65 not used)
• (top of fuel injection pump) fuel pressure regulator 1
• (top of fuel pump assembly) fuel heater
• 5 volt ref
• Anti-lock brakes system
• B pnk
• Dfi volt ctrl cyl 1
• Dfi volt ctrl cyl 4
• Dfi volt ctrl cyl 6
• Dfi volt ctrl cyl 7
• Dfi volt sply cyl 1
• Dfi volt sply cyl 4
• Dfi volt sply cyl 6
• Dfi volt sply cyl 7
• Engine control module (ecm)
• Engine oil pressure (eop) sensor (lower left side of engine)
• Exhaust gas recirculation (egr) temperature sensor 1
• Fuel injector 1 (on right side of engine)
• Fuel injector 6 (on left side of engine)
• Fuel injector 7 (on right side of engine)
• G103 (left rear of engine)
• G109
• G109 (lower right front of engine)
• G110
• G110 (lower left front of engine)
• G400
• Gnd
• J101
• J160
• J161
• J164
• J316
• Low ref
• Multi-function intake air sensor
• Nca
• Oil level sw sig
• Pnk
• Sens volt ref
• Sol high sig
• Sol low sig
• Sol sply volt
• Tan
• Turbocharger vane position control solenoid valve (at right side of turbocharger)
• Turbocharger vane position sensor (on top of turbocharger)
• Valve high ctrl
• Valve low ctrl
• Vehicle spd sig
• X110
• X316