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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Hybrid Engine Controls - DTC P181C To DTC P2797) >> DTC P1A8A >> Circuit/System Testing
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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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