Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2012EXPRESS 2500 V8-4.8LREPAIR AND DIAGNOSISPOWER AND GROUND DISTRIBUTIONDIAGRAMSELECTRICAL DIAGRAMSPOWER MODING SCHEMATICS
2012 Chevrolet Express 2500 V8-4.8L
Power Moding Schematics
2012 Chevrolet Express 2500 V8-4.8LSECTION Power Moding Schematics
Power Moding Schematics
RUN/CRNK Relay
Master Electrical Component List
Power Mode Description and Operation
Control Module References
RAP and RUN Relays
Ignition Switch and IGN SW (DLIS)/PK3 Fuse
Electrical Center Identification Views
AIRBAG, BRK SW, ECM IGN/GLOW PLUG MDL IGN, FCSM IGN, IPC, STR/WHL/SNSR, TCM IGN, and TRANS Fuses
G102, G110 and G120
RAP and RUN Relays
Master Electrical Component List
Power Mode Description and Operation
Control Module References
RUN/CRNK Relay
AUX PWR OUTLET, BCM-1, BCM-2, BCM-3, BCM-4, BCM-5, BCM-6, BCM-7, FOH MDL, FRT BLWR, LTR/DLC, and TRLR WRG Fuses
Electrical Center Identification Views
AIRBAG/AOS, OSRVM HTR, and REAR DEFOG Fuses and PWR WINDOW(S) Circuit Breaker
HVAC1 and HVAC2 Fuses
AUX/TRLR BCK/UP, CMPS, READING LAMP(S), TAIL LAMP(S), AND UPFITTER AUX2 Fuses
Electrical Center Identification Views
G302 (2 of 2)
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.