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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Anti-Lock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information and Procedures >> DTC C0055 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Use a scan tool in order to clear the DTCs. Cycle the ignition to OFF and then start the engine. A current failure will set a DTC.
    • If the DTC does not reset, go to Diagnostic Aids.
  2. Turn OFF the ignition and disconnect the EBCM harness connector. At the EBCM harness connector terminal 28, test for 10 volts on the vehicle speed signal circuit.
    • If the voltage is below 10 volts, test for an open or short to ground on the vehicle speed signal circuit. If all circuits test normal, replace the EBCM.
  3. Ignition ON, verify that a test lamp does not illuminates between the vehicle speed signal circuit terminal 28 and ground.
    • If the test lamp illuminate, test the vehicle speed signal circuit for a short to B+. If the circuit tests normal, replace the EBCM.
  4. If all circuits test normal, replace the PCM.
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