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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1737 (Automatic Transmission - ALLISON - DTC P0218 To DTC P0878) >> DTC P0842, P0847, or P0872 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: Chock the wheels to prevent the vehicle from moving. Failure to chock the wheels can cause personal injury when the electrical system is repaired.
  1. Perform the Transmission Fluid Level and Condition Check to verify correct fluid level and condition.
  2. Parking brake ON, engine running at idle, transmission in drive, command the transmission through all forward ranges with a scan tool. Verify the TFP Switch 1, TFP Switch 2, and TFP Switch 3 parameter states are correct for each forward range. Refer to Pressure Switch Manifold (PSM) Logic .
  3. 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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