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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 331 (Engine Electrical - Hybrid) >> Diagnostic Information and Procedures >> DTC P0AFB >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that no hybrid powertrain control module (HPCM) DTCs are set due to high battery voltage.
  2. Engine running or autostop, observe the scan tool ACCM High Battery Voltage parameter. The reading should be between 225 V and 380 V.
    • If greater than the specified range, replace the ACCM.
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