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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1376 (Engine Controls And Fuel - Hybrid (Hp2) 6.0L (LFA) - DTC P0231 To DTC P069E) >> DTC P0351-P0358 >> 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.
IMPORTANT: Perform the Circuit/System Verification first.
  1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    3. IMPORTANT: A high resistance on any IC circuit can cause a misfire condition before DTCs P0351-P0358 set.
  3. Engine running, monitor the Cylinder 1-8 IC Circuit Status parameters with a scan tool.
    • If a short to GND or Open status test displays FAULT, test for an open/high resistance ore short to ground on the affected IC circuit terminal C.
    • If a short to volts status test displays FAULT, test for a short to voltage on the affected IC circuit terminal C.
  4. Exchange the affected ignition coil/module with the ignition coil/module of a cylinder that is not affected.
  5. Start and run the engine. With a scan tool, monitor the IC circuit parameters and the misfire current counters.
    • If the circuit status fault identified or the misfire transfers with the ignition coil/module, replace the ignition coil/module assembly.
    • If the circuit status fault identified or the misfire does not transfer with the ignition coil/module, replace the ECM.
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