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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1056 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0973 To DTC P2764) >> DTC P1825 or P1915 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the IMS connector at the control solenoid (w/body and TCM) valve assembly. Ignition On. The scan tool IMS A/B/C/P parameter should display HI for all four signal circuits.
    • If a signal circuit displays LOW, the control solenoid (w/body and TCM) valve assembly is faulty.
  2. Connect a 3-amp fused jumper wire between each transmission range signal circuit at the control solenoid (w/body and TCM) valve assembly and ground ensuring the signal circuit displays LOW when connected to ground.
    • If a signal circuit remains HI when connected to ground, the control solenoid (w/body and TCM) valve assembly is faulty.
    • If the above two tests indicate correct TCM functions, the IMS is faulty.
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