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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1379 (Automatic Transmission - ALLISON - DTC P0880 To DTC P2771) >> DTC P2536 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the TCM.
  2. Ignition ACCESSORY, test for greater than 5 V on the signal circuit between the TCM harness connector terminal 43 and ground.
    • If less than the specified value, test signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. If the signal circuit tests normal, replace the TCM.
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