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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. This DTC indicates the PCM is not communicating data to the TCM. Inspect for loose or disconnected CAN wiring connectors at the TCM and the PCM. Were loose connectors found? If so, go to next step. If not, go to step  4.
  3. Repair the vehicle CAN wiring harness. Is the repair complete? If so, go to step  6. If not, go to next step.
  4. Remove the C1 connector from the TCM. Measure the resistance between TCM C1 connector terminals No. 29 and 32. Was the resistance greater than 60 ohms? If so, go to next step. If not, go to step  6.
  5. Repair the vehicle CAN wiring harness. A resistance reading greater than 60 ohms usually indicates that a terminating resistor is missing. There should be two 120-ohm resistors wired in parallel in the CAN wiring harness. Is the repair complete? If so, go to next step.
  6. Perform the following procedure to verify the repair:
    • Clear the DTC.
    • Drive the vehicle under normal operating conditions.
    • Connect the scan tool.

    Did the DTC return? If so, go to step  1. If not, system is okay.

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