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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 P1A89 >> 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. Disconnect the 42 Volt harness connector at the APM.
  2. Turn the ignition to ON.
  3. Use the APM Intermediate Voltage Control on the scan tool to turn on the 42 volt circuit.
    • If the voltage is greater than 40 volts, replace the power steering control module (PSCM).
    • If the voltage is less than 40 volts, replace the APM.
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