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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.
  1. Inspect for DTCs P0A40, P0A45, P0A46, P0A78, P0A79, P0A3F, P0C05, P0C08, P0C0B, P0C0E, P0C4E, P0C4F, P0C52, P0C53, P0C57, P0C58, P0C61, P0C62, P0C5C, P0C5D, P1B03, P1B04 or P1B0D.
    • If any of the above DTCs are set, diagnose and repair them prior to performing this diagnostic.
  2. Ignition ON, engine OFF. Observe the HPCM 300V Circuit parameter. The hybrid battery voltage should be greater than 192V.
    • If the hybrid battery voltage is less than 192V perform the Jump Assist procedure and attempt to successfully charge the hybrid battery. Re-test for this DTC after the Jump Assist procedure is complete. Refer to Jump Assist .
  3. Turn the ignition OFF and wait 2 minutes.
  4. Turn the ignition ON without cranking the engine. Monitor DTC Status. DTC P0C17 and P0C18 should have passed last test.
    • If DTC P0C4E or P0C4F sets, proceed to that diagnostic procedure.
    • If DTC P0C17 and P0C18 have passed, clear DTC Information. No further diagnosis is necessary.
    • If DTC P0C17 or P0C18 resets, program the PIM with the latest software version and recheck for DTCs. If the DTC resets after programming or if the PIM already contains the latest software version, replace the drive motor generator assembly.
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