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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 P1A8B or P1A8C >> 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. Place the vehicle in Park and start the engine.
  2. Place the steering wheel in the centered position. Do not rotate the steering wheel.
  3. Observe the 42V Circuit Current parameter in the APM data list on the scan tool.
    • If the 42V Circuit Current parameter is greater than 0.5 amps with no steering input, replace the power steering control module (PSCM).
  4. Rapidly rotate the steering wheel to the left and right while observing the 42V Circuit Current parameter.
    • If the 42V Circuit Current parameter is greater than 40 amps, replace the PSCM.
    • If the 42V Circuit Current parameter is less than 40 amps, replace the APM.
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