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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1373 (Automatic Transmission - ALLISON - DTC P0218 To DTC P0878) >> DTC P0657 or P0658 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, engine OFF, command the Modulated Main Pres. Ctrl. Sol., the TCC Control Solenoid, and the PC Solenoid 1 ON and OFF with a scan tool. Observe the operation of the Line PC Sol. Pressure Command, TCC PC Solenoid Pressure Command, and PC Solenoid 1 Pressure Command parameters. The parameters should change from 0 kPa (0 psi) to 1600 kPa (232 psi).
  2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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