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 107 (HYBRID ENERGY STORAGE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P1AE5CIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C
Circuit/System Testing
2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Verify if DTC P2534 is set.
- If DTC P2534 is set, diagnose this DTC first.
- Ignition OFF. Remove the drive motor generator control module (DMCM) assembly sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement .
- Disconnect drive motor generator power inverter module assembly (PIM) connector X1.
- Ignition ON, verify that the contactor system request command parameter indicates 100 percent using a scan tool.
- If the display is less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the drive motor generator battery control module.
- Connect a 3A fused jumper wire between the control circuit X1 terminal 4 and ground. Verify that the Contactor System Request Command parameter indicates 0 percent.
- If the display is greater than the specified range, test the control circuit for a open or short to voltage. If the circuit tests normal, replace the drive motor generator battery control module.
- If the specified range is displayed, replace the PIM.
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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.