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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 536 (ANTILOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C1291DIAGNOSTIC AIDS
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Diagnostic Aids
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Diagnostic Aids
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
- Diagnose any wheel speed sensor DTCs before continuing with the diagnosis of the DTC.
- A deceleration cycle consists of the following sequence:
- The vehicle speed is greater than 24 km/h (15 mph).
- The vehicle decelerates more than 8 km/h/second (5 mph/second) for 2 seconds.
- The vehicle speed decelerates to less than 16 km/h (10 mph).
- Verify proper stop lamp switch operation using the data list of the scan tool. As the brake is applied, the data list displays the stop lamp switch on within 2.54 cm (1 in) of travel.
- Possible causes of this DTC are the following conditions:
- An open stop lamp switch
- The stop lamp switch is misadjusted
- An open fuse
- Circuit has a wiring problem, terminal corrosion, or poor connections
- Erratic wheel speeds
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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.