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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 475 (Engine Electrical (Battery) - Hybrid (Hp2)) >> Diagnostic Information and Procedures >> DTC P0AFA >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 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) or engine control module (ECM) DTCs are set that indicate generator, HPCM, or battery failure, or that disable the high voltage.
  2. Engine running or autostop, observe the scan tool accessory DC power control module (APM) HPCM 300V Circuit parameter. The reading should be between 225 V and 380 V.
    • If not within the specified range, refer to Jump Assist .
  3. Ignition ON, observe the scan tool ACCM High Battery Voltage parameter. The reading should be between 225 V and 380 V.
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