Diagnostic Aids

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.

Battery temperatures can be affected by vehicle load, outside temperature and customer driving conditions. Test drive the vehicle, and attempt to simulate the Freeze Frame/Failure Record conditions this DTC set under.
Inspect for the following:
- Air inlet and outlet for blockage.
- Loose or poor connections at the drive motor generator battery control module temperature sensor module wiring harness (X3) connector.
- Damage to the drive motor generator battery control module temperature sensor module wiring harness.
- Damage to the fan or blades.
Test the resistance across each temperature sensor 5 volt reference and low reference circuits. Refer to Temperature Versus Resistance .
If the hybrid batteries are at or above the temperature values for setting these DTCs, allow the hybrid batteries to cool down by letting the vehicle stand at room temperature, this could take 4 to 8 hours.
Use the special function test on the scan tool to test the drive motor generator battery vent fan operation.
Inspect the ground circuit for the drive motor generator battery vent fan relay.
Inspect the drive motor generator battery vent fan relay connections.