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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 492 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESSTOP LAMPS MALFUNCTIONCIRCUIT/SYSTEM TESTINGSTOP LAMP SWITCH MALFUNCTION
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Stop Lamp Switch Malfunction
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Stop Lamp Switch Malfunction
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the stop lamp switch.
- Verify that a test lamp illuminates between the 12-volt reference circuit terminal C and ground.
- If the test lamp does not illuminate, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition ON, verify the scan tool Stop Lamp Switch Status parameter reading is 1 Count.
- If greater than the specified value, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the BCM.
- Connect a 3A fused jumper wire between the signal circuit terminal D and the voltage reference circuit terminal C. Verify the scan tool Stop Lamp Switch Status parameter is 1023 Counts.
- If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- If all circuits test normal, test or replace the stop lamp switch.
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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.