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 MANUALSCHEVROLET2008EXPRESS 2500 V8-6.6L DSL TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDIAGRAMSDIAGNOSTIC AIDSGENERAL ELECTRICAL DIAGNOSTIC PROCEDURESCHECKING AFTERMARKET ACCESSORIES
2008 Chevrolet Express 2500 V8-6.6L DSL Turbo
Checking Aftermarket Accessories
2008 Chevrolet Express 2500 V8-6.6L DSL TurboSECTION Checking Aftermarket Accessories
Checking Aftermarket Accessories
Do not connect aftermarket accessories into the following circuits:
Caution: Refer to Restraint System Service Precautions.
* SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
Notice: Refer to OBD II Symbol Description Notice.
* OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.
Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems.
Possible causes of vehicle problems related to aftermarket accessories include:
* Power feeds connected to points other than the battery
* Antenna location
* Transceiver wiring located too close to vehicle electronic modules or wiring
* Poor shielding or poor connectors on antenna feed line
* Check for recent service bulletins detailing installation guidelines for aftermarket accessories.
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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.