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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1148 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0974) >> DTC P0815, P0816, P0826, or P1876 >> Circuit/System Testing >> P0816

Circuit/System Testing: P0816

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. Select the Driver Shift Request parameter.
  2. Disconnect the Automatic Transmission (AT) shift program switch connector.
    • If the parameter status changes from Downshift to Invalid, replace the AT shift program switch.
    • If the parameter status does not change, replace the control solenoid (w/body and TCM) valve assembly.
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