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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> 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 >> P0826

Circuit/System Testing: P0826

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. Inspect the fuse in the ignition 3 voltage circuit for an open.
    • If the fuse is Open, test the ignition 3 and the Tap/Up and Tap/down circuit for a short to ground.
    • If the fuse is OK, test the ignition 3 and the Tap/Up and Tap/down signal circuit for an Open or Short to Voltage.
  2. Test the AT/DSC shift program switch for correct resistance value, 8.11-8.39 ohms.
    • If the resistance is not within specifications, replace the switch assembly.
    • If the resistance is within specifications, replace the control solenoid (w/body and TCM) valve assembly.
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