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2012 GMC Yukon Denali Hybrid – No Crank With P0BBD
CUSTOMER CONCERN The vehicle has a no-crank, no-start condition with a Service Hybrid System message and DTC P0BBD after an earlier stall. CAUSE The BECM reported insufficient drive-motor battery voltage, and the confirmed repair identified the high-voltage battery assembly as failed. CORRECTION Remove and replace the drive-motor high-voltage battery assembly, clear DTC P0BBD, and verify starting and hybrid-system operation.
2012 GMC Yukon Denali Hybrid – No Power Steering With C056E-4B
CUSTOMER CONCERN Power-steering assist is unavailable and the PSCM stores DTC C056E-4B. CAUSE The confirmed repair identified an invalid Power Steering Control Module calibration rather than a failed steering motor or power circuit. CORRECTION Calibrate the Power Steering Control Module and perform the steering position and torque-sensor calibration, then clear C056E-4B and verify steering assist.
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