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Home >> Hummer >> 2007 >> H2 4D Utility Pickup >> Repair and Diagnosis >> External Pages >> Different car >> Section 1734 (Hybrid Energy Storage System) >> Diagnostic Information and Procedures >> DTC P1A21 >> Circuit/System Verification
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Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that DTC P1AE4, P0A80, P1ABE, or P1A0C is not set.
  2. Verify that DTC P1A21 is not set.
    • If DTC P1A21 is set, replace the drive motor generator battery control module.
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