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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1358 (Hybrid Controls - DTC P181C To DTC P2797) >> DTC P1A8A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  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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