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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 Verification

Circuit/System Verification

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 voltage is less than 40 volts, proceed to Circuit/System Testing.
  3. Rotate the steering wheel back and forth while stationary.
    • If the voltage is less than 40 volts, the EPS is drawing excessive current. Replace the power steering motor.
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