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 899 (FRAME AND UNDERBODY)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC CODE INDEX
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Diagnostic Code Index
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Diagnostic Code Index
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC B051A, B051B, B051C, or B051D | DTC B051A 0B Left Side Assist Step Motor Control Circuit Current Above Threshold DTC B051A 01 Left Side Assist Step Motor Control Circuit Short to Battery DTC B051A 02 Left Side Assist Step Motor Control Circuit Short to Ground DTC B051A 04 Left Side Assist Step Motor Control Circuit Open Circuit DTC B051B 0B Right Side Assist Step Motor Control Circuit Current Above Threshold DTC B051B 01 Right Side Assist Step Motor Control Circuit Short to Battery DTC B051B 02 Right Side Assist Step Motor Control Circuit Short to Ground DTC B051B 04 Right Side Assist Step Motor Control Circuit Open Circuit DTC B051C 01 10 V Reference Circuit Short to Battery DTC B051C 02 10 V Reference Circuit Short to Ground DTC B051C 2A Left Side Assist Step Position Sensor Circuit Too Many Pulses DTC B051C 22 Left Side Assist Step Position Sensor Circuit Low Time < Minimum DTC B051C 29 Left Side Assist Step Position Sensor Circuit Too Few Pulses DTC B051C 62 Left Side Assist Step Position Sensor Circuit Actuator Stuck Open DTC B051C 63 Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed DTC B051D 2A Right Side Assist Step Position Sensor Circuit Too Many Pulses DTC B051D 22 Right Side Assist Step Position Sensor Circuit Low Time < Minimum DTC B051D 29 Right Side Assist Step Position Sensor Circuit Too Few Pulses DTC B051D 62 Right Side Assist Step Position Sensor Circuit Actuator Stuck Open DTC B051D 63 Right Side Assist Step Position Sensor Circuit Actuator Stuck Closed |
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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.