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Home >> Hummer >> 2007 >> H2 4D Utility Pickup >> Repair and Diagnosis >> External Pages >> Different car >> Section 1719 (Antilock Brake System - Non-Hybrid Greater Than/Equal To 3900 Kg (8600 Lb) GVW With TCS & VES) >> Diagnostic Information and Procedures >> DTC C0055 or P0609 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: A condition may result in a stored history DTC C0055, check the replicated transmission output speed signal circuit for damaged wires, missing pulses or electrical noise that may be passed to 128K pulses/mile engine speed signal.
  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Ignition ON, test for greater than 10 V between the signal circuit terminal 20 and ground.
    • If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition OFF, disconnect the appropriate harness connector listed below at the ECM:
    • X1 (LY6)
    • X2 (Diesel)
  4. Ignition ON, verify that a test lamp does not illuminate between the appropriate signal circuit terminal listed below and ground.
    • Terminal 57 X1 (LY6)
    • Terminal 54 X2 (Diesel)
    • If the test lamp illuminates, test the signal circuit for a short to voltage.
  5. If the circuit tests normal, replace the EBCM.
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