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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ignition on, engine off. Record the DTC freeze frame and failure records. Clear the DTC. Is there a DTC P0721 or P0722 present? If so, see DTC P0721: OUTPUT SPEED SENSOR CIRCUIT - PERFORMANCE  or DTC P0722: OUTPUT SPEED SENSOR CIRCUIT - NO SIGNAL  . If not, go to next step.
  3. Raise and support the vehicle. Start and idle the engine. Turn off the traction control system, if equipped. Select and monitor VSS on the scan tool. Place the gearshift lever in Drive position. With the drive wheels rotating, slowly increase the engine speed. Does vehicle speed on the scan tool increase with wheel speed? If so, see DIAGNOSTIC AIDS . If not, go to next step.
  4. Turn engine off. Disconnect connector C2 at the PCM. Turn ignition on. Using a DVOM and Terminal Test Kit (J-35616-A), test the signal circuit (400) for voltage between PCM connector C2 terminal No. 21 and ground. Is the circuit voltage 4-5 volts? If so, go to step  7. If not, go to next step.
  5. Turn ignition off. Test the signal circuit (400) between the TCM and PCM for an open or a short to ground. Did you find and correct a condition? If so, go to step  8. If not, go to next step.
  6. Replace the TCM. See TRANSMISSION CONTROL MODULE  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  8.
  7. Replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  8. Perform the following procedure to verify the repair:
    • Select the DTC.
    • Select CLEAR INFO.
    • Operate the vehicle within the conditions for running the DTC.
    • Select TRANSMISSION SPECIFIC DTC.
    • Enter DTC P0500.

    Has the test run and passed? If so, system is okay. If not, go to step  1.

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