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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (Hybrid Energy Storage System) >> Diagnostic Information and Procedures >> DTC P0ABB, P0ABC, or P0ABD >> Circuit/System Testing >> P0ABC

Circuit/System Testing: P0ABC

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. Verify if DTCs P0C77 or P1A20 are set.
    • If DTCs P0C77 or P1A20 are set, diagnose them first.
  2. Ignition ON, observe the BECM hybrid battery pack calculated voltage parameter using a scan tool.
    • If the voltage is below 194 volts, replace the drive motor generator battery.
  3. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
  4. Remove the drive motor generator battery case upper cover, front cover and right side cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
  5. Connect the 12 volt battery.
  6. Ignition ON, engine OFF, connect a DMM between HV+ and HV- terminals of the HV positive contactor relay. With a scan tool, command the HV positive relay CLOSED. Verify less than 0.5 ohms of resistance.
    • If the resistance is greater than the specified value, replace the HV Positive contactor relay.
  7. Ignition ON, engine OFF, connect a DMM between HV+ and HV- terminals of the HV negative relay. With a scan tool, command the HV negative relay CLOSED. Verify less than 0.5 ohms of resistance.
    • If the resistance is greater than the specified value, replace the HV negative relay.
  8. Test for an open or high resistance in the HV DC cables between the HV positive and negative contactor relays and the HV hybrid battery terminals.
    • Replace any damaged or open components as required.
  9. Test for an open or high resistance in the HV DC cables between the HV positive and negative contactor relays and the HV terminal block.
    • Replace any damaged or open components as required.
  10. Test for an open or high resistance in the HV positive and negative sensor harness between the 300V terminal block and the BECM X5 connector.
    • Replace any damaged or open components as required.
    • If all circuits test normal, replace the drive motor generator battery control module.
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