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2011 Chevrolet Tahoe Hybrid – No Power Steering With C0460 and C056E-4B
CUSTOMER CONCERN Power-steering assist is unavailable, the Service Power Steering message is displayed, and DTCs C0460-00 and C056E-4B are stored. CAUSE Resistance and harness testing confirmed an internal failure of the power-steering assist motor. CORRECTION Remove and replace the failed power-steering assist motor.
2011 GMC Yukon Denali Hybrid – Service Suspension Message With U0132
CUSTOMER CONCERN The Service Suspension message is displayed after collision repairs, communication with the Electronic Suspension Control Module is unavailable, and DTC U0132-00 is stored in multiple modules. CAUSE Power, ground, network resistance and connector checks passed, confirming an internal failure of the Electronic Suspension Control Module. CORRECTION Remove and replace the failed Electronic Suspension Control Module, program and configure the replacement module,
2010 Chevrolet Silverado 1500 Hybrid – Repeat Valve-Cover Oil Leak
CUSTOMER CONCERN A valve-cover oil leak returns, the oil dipstick is pushed out of its tube, and moisture is present in the fresh-air tube. CAUSE Inspection confirmed a failed crankcase-ventilation condition was allowing pressure and moisture buildup at the valve cover. CORRECTION Remove and replace the valve cover and install the updated vented oil-fill cap.
2013 Chevrolet Volt – Service High Voltage Charging System With P0AA6
CUSTOMER CONCERN The Driver Information Center displays Service High Voltage Charging System, and DTCs P0AA6, P1F0E and P1FFF are stored. CAUSE The confirmed repair identified outdated hybrid-control-module calibration after the high-voltage isolation and coolant checks did not reveal a hardware fault. CORRECTION Program and configure the Hybrid Powertrain Control Module 2 and companion hybrid-control module with the updated calibration.
2014 Chevrolet Volt – No Crank No Start With P0AFA
CUSTOMER CONCERN The vehicle will not crank or start after dying in traffic. DTC P0AFA and related Hybrid Powertrain Control Module codes are stored. CAUSE Inspection confirmed the 12-volt battery was leaking acid and had failed, while the high-voltage battery retained normal voltage and state of charge. CORRECTION Remove and replace the failed 12-volt battery, then perform the Clear Secured High Voltage DTCs procedure.
2011 Chevrolet Volt – Check Engine Light With P1E00 and P0C4A
CUSTOMER CONCERN The check-engine light remains on after collision repairs, and DTCs P1E00 and P0C4A are stored. CAUSE Cooling-system diagnosis confirmed the hybrid/EV battery-pack coolant pump had failed. CORRECTION Remove and replace the failed hybrid/EV battery-pack coolant pump.
2011 Chevrolet Volt – Service High Voltage Charging System With P1FFD and P1FFF
CUSTOMER CONCERN The Driver Information Center displays Service High Voltage Charging System, and DTCs P1FFD and P1FFF are stored. CAUSE Software review confirmed the Hybrid Powertrain Control Module 2 calibration was outdated for this condition. CORRECTION Program and configure the Hybrid Powertrain Control Module 2 with the updated calibration.
2009 GMC Yukon Hybrid – No Start With P0BBD After Contaminated Fuel
CUSTOMER CONCERN The engine will not start and the Service Hybrid System message is displayed after repeated restart attempts. Battery Energy Control Module DTC P0BBD is stored. CAUSE Inspection confirmed water-contaminated fuel had entered the fuel system, and repeated attempts to start the gasoline engine discharged the high-voltage battery. CORRECTION Remove the contaminated fuel, clean or replace the affected fuel-system components, perform the required engine-oil and ind
2011 Chevrolet Silverado 1500 Hybrid – Oil Pressure Gauge at 0 PSI With P0523
CUSTOMER CONCERN The engine oil-pressure gauge reads 0 PSI, and the Engine Control Module stores DTC P0523. CAUSE Circuit checks found 5 volts on the gray reference wire, ground on the black wire and 0 volts on the tan/white signal wire, confirming a failed engine oil-pressure sensor. CORRECTION Remove and replace the failed engine oil-pressure sensor.
2011 Chevrolet Silverado 1500 Hybrid – Airbag Light With B0085 and B0086
CUSTOMER CONCERN The airbag warning light stays on, and the Sensing and Diagnostic Module stores DTCs B0085 and B0086. CAUSE Inspection confirmed the purple/white and white wires for the left-front Side Impact Sensor were broken in the driver-door jamb. CORRECTION Repair the broken left-front Side Impact Sensor circuits in the driver-door jamb.
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