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 DIAGNOSISDIAGRAMSELECTRICAL DIAGRAMSPOWERTRAIN MANAGEMENTINFORMATION BUS
2012 Chevrolet Express 2500 V8-4.8L
Information Bus
2012 Chevrolet Express 2500 V8-4.8LSECTION Information Bus
Data Communication Schematics
Low Speed GMLAN
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
High Speed GMLAN (Gas)
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
Master Electrical Schematic Icons
Master Electrical Schematic Icons
G302 (2 of 2)
High Speed GMLAN (Gas)
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
High Speed GMLAN (Diesel)
Low Speed GMLAN
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
High Speed GMLAN (Diesel)
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Powertrain Expansion Bus (LGH)
High Speed GMLAN (Gas)
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Powertrain Expansion Bus (LGH)
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Accessory Wakeup
High Speed GMLAN (Diesel)
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Master Electrical Schematic Icons
Accessory Wakeup
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Communications Enable
Powertrain Expansion Bus (LGH)
Ignition Switch and IGN SW (DLIS)/PK3 Fuse
Communications Enable
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Accessory Wakeup
RENDER: 1.0x
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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.