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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1150 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0976 To DTC P2764) >> DTC P1684, P1685 or P1686 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear the DTC and operate the vehicle under the condition for running and setting the DTC.
  2. Shut the ignition OFF for 30 seconds, and verify that the DTC does not reset.
    • If the DTC resets, replace the control solenoid (w/body and TCM) valve assembly.
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