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Home >> GMC >> 2022 >> Hummer EV >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Converters and Controllers >> Hybrid/EV Controls >> Diagnostic Information and Procedures >> DTC P0A78 >> Circuit/System Verification
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Circuit/System Verification

  1. Vehicle On - Service Mode
  2. Verify DTC P0A78 is not set.
    • If any of the DTCs are set 
    1. Clear the DTCs Ignition/Vehicle - Off - 10 minutes to allow all control modules to shut down.
    2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
    3. Verify the DTC does not set.
      • If the DTC sets - Refer to: Circuit/System Testing
      • Go to next step: If the DTC does not set
    4. All OK.
    • Go to next step: If none of the DTCs are set 
  3. All OK.
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