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Home >> Chevrolet >> 2008 >> Chevy Express G2500, Van Passenger >> Repair and Diagnosis >> Brakes >> Anti-Lock Brake System, Traction Control System & Stability Control System >> Diagnostic Information and Procedures >> DTC C0055 or P0609 >> Circuit/System Testing

Circuit/System Testing

  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.
  2. Turn OFF the ignition and disconnect the EBCM vehicle speed sensor harness connector. At the EBCM harness connector, 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 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 ECM/PCM.
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