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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 237 (FRAME AND UNDERBODY)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC CODE INDEX
2009 Chevrolet Tahoe Base, 4.8 C
Diagnostic Code Index
2009 Chevrolet Tahoe Base, 4.8 CSECTION Diagnostic Code Index
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2010 GMC Yukon XL, 2010 GMC Yukon, 2010 Chevrolet Tahoe, 2010 Chevrolet Suburban, and 2010 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 | B051A 0B: Left Side Assist Step Motor Control Circuit Current Above Threshold B051A 01: Left Side Assist Step Motor Control Circuit Short to Battery B051A 02: Left Side Assist Step Motor Control Circuit Short to Ground B051A 04: Left Side Assist Step Motor Control Circuit Open Circuit B051B 0B: Right Side Assist Step Motor Control Circuit Current Above Threshold B051B 01: Right Side Assist Step Motor Control Circuit Short to Battery B051B 02: Right Side Assist Step Motor Control Circuit Short to Ground B051B 04: Right Side Assist Step Motor Control Circuit Open Circuit B051C 01: 10 V Reference Circuit Short to Battery B051C 02: 10 V Reference Circuit Short to Ground B051C 2A: Left Side Assist Step Position Sensor Circuit Too Many Pulses B051C 22: Left Side Assist Step Position Sensor Circuit Low Time < Minimum B051C 29: Left Side Assist Step Position Sensor Circuit Too Few Pulses B051C 62: Left Side Assist Step Position Sensor Circuit Actuator Stuck Open B051C 63: Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed B051D 2A: Right Side Assist Step Position Sensor Circuit Too Many Pulses B051D 22: Right Side Assist Step Position Sensor Circuit Low Time < Minimum B051D 29: Right Side Assist Step Position Sensor Circuit Too Few Pulses B051D 62: Right Side Assist Step Position Sensor Circuit Actuator Stuck Open 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.