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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 865 (Instrument Panel System Displays And Gauges) >> Diagnostic Information & Procedures >> DTC P0381 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector X2 at the ECM.
  2. Ignition ON, verify that the wait to start indicator is OFF.
    • If not OFF, test the wait to start indicator control signal circuit for a short to ground. If the circuit tests normal, replace the instrument panel cluster (IPC).
  3. Install a 3-amp fused jumper between the wait to start control signal circuit and ground. Verify that the wait to start indicator is ON.
    • If not ON, test the wait to start indicator control signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.
  4. If all circuits test normal, replace the ECM
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