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 MANUALSGMC2013YUKON 4WD V8-6.0L HYBRIDREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONP CODE CHARTSP1A4F
2013 GMC Yukon 4WD V8-6.0L Hybrid
P1A4F
2013 GMC Yukon 4WD V8-6.0L HybridSECTION P1A4F
DTC P1A4F, P1A50-P1A54, P1ADC, or P1ADD
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P1A4F
-
Drive Motor 1 Control Module Not Programmed
DTC P1A50
-
Drive Motor 1 Control Module Random Access Memory (RAM)
DTC P1A51
-
Drive Motor 1 Control Module Read Only Memory (ROM)
DTC P1A52
-
Drive Motor 2 Control Module Not Programmed
DTC P1A53
-
Drive Motor 2 Control Module Random Access Memory (RAM)
DTC P1A54
-
Drive Motor 2 Control Module Read Only Memory (ROM)
DTC P1ADC
-
Drive Motor 1 Control Module Long Term Memory Performance
DTC P1ADD
-
Drive Motor 2 Control Module Long Term Memory Performance
Circuit/System Description
The drive motor control modules are internal to the drive motor generator power inverter module assembly and are not serviced separately. This fault is handled inside the drive motor control modules and no external circuits are involved.
Conditions for Running the DTC
* The ignition is ON.
* Ignition voltage is 8-18 V.
Conditions for Setting the DTC
The control module has detected an internal malfunction.
Action Taken When the DTC Sets
* DTCs P1A4F, P1A50, P1A51, P1A52, P1A53, P1A54, P1ADC and P1ADD are Type A DTCs.
* The drive motor generator power inverter module commands the battery energy control module to open the high voltage contactor relays.
Conditions for Clearing the DTC
DTCs P1A4F, P1A50, P1A51, P1A52, P1A53, P1A54, P1ADC and P1ADD are Type A DTCs.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Verification
If the DTC is set, program the T6 drive motor generator power inverter module. If the DTC resets, replace the T6 drive motor generator power inverter module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Control Module References for Drive Motor Generator Power Inverter Module replacement, setup, and programming.
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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.