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Home >> GMC >> 2008 >> Yukon Base, 4.8 C >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Hybrid Engine Control System) >> Diagnostic Information and Procedures >> DTC P1A8A >> Circuit/System Testing

Circuit/System Testing

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  1. Start the engine.
  2. Using the scan tool, observe the 42V Circuit Voltage parameter on the APM data list.
    • If the 42V Circuit Voltage parameter is greater than 48 volts, replace the APM.
    • If the 42V Circuit Voltage parameter is less than 48 volts, replace the PSCM.
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