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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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. Inspect the engine cooling system for air flow restrictions, blockage or debris. Inspect the transmission cooling system for air flow restrictions, blockage or debris. Inspect for damaged cooler lines or hoses. Inspect for low transmission fluid cooler flow. See SERVICING - "C" & "K" SERIES (ALLISON) article. Did you perform the inspection and correct the conditions if necessary? If so, go to next step.
  3. Check the transmission fluid level. See SERVICING - "C" & "K" SERIES (ALLISON) article. Is the transmission fluid level correct? If so, go to next step.
  4. Turn ignition off. Install Breakout Box (J-39700) and Breakout Box Adapter (J-43799) at TCM connector C2. Turn ignition on, engine off. Use DVOM to check the voltage between TCM connector C2 terminals No. 10 and 20. Is the voltage 4.75-5.25 volts? If so, go to next step. If not, go to step  12.
  5. Install the scan tool. Turn ignition on, engine off. Record the DTC failure records. Clear the DTC. Select TFT on the scan tool. Drive the vehicle and watch for an unrealistic transmission fluid temperature reading. Are there unrealistic transmission fluid temperature readings? If so, go to next step. If not, see DIAGNOSTIC AIDS .
  6. Disconnect transmission in-line 20-way connector. Measure the resistance of the TFT sensor between transmission in-line 20-way connector terminals "G" and "H". See COMPONENT RESISTANCE  under ELECTRONIC COMPONENT SPECIFICATIONS. Is the resistance within the specified range? If so, go to next step. If not, go to step  9.
  7. Reconnect transmission in-line 20-way connector. Disconnect the C2 connector at the TCM. Measure resistance between TCM connector C2 terminals No. 10 and 20. See COMPONENT RESISTANCE  under ELECTRONIC COMPONENT SPECIFICATIONS. Is the resistance within the specified range? If so, see DIAGNOSTIC AIDS . If not, go to next step.
  8. Repair the vehicle wiring harness. Is the repair complete? If so, go to step  13.
  9. Remove the oil pan. See SERVICING - "C" & "K" SERIES (ALLISON) article. Disconnect the internal wiring harness from the pressure switch manifold. Measure the resistance between pressure switch manifold terminals "E" and "F". See COMPONENT RESISTANCE  under ELECTRONIC COMPONENT SPECIFICATIONS. Is the resistance within the specified range? If so, go to next step. If not, go to step  11.
  10. Replace the internal wiring harness. See TRANSMISSION INTERNAL WIRING HARNESS  under REMOVAL & INSTALLATION. Is the replacement complete? If so, go to step  13.
  11. Replace the pressure switch manifold. See PRESSURE SWITCH MANIFOLD  under REMOVAL & INSTALLATION. Is the replacement complete? If so, go to step  13.
  12. Replace the TCM. See TRANSMISSION CONTROL MODULE  under REMOVAL & INSTALLATION. Is the replacement complete? If so, go to next step.
    CAUTION: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.
  13. Perform the following procedure to verify the repair:
    • Clear the DTC.
    • Using the scan tool, monitor the transmission fluid temperature.
    • Drive the vehicle under normal operating conditions.
    • Look for significant changes in transmission fluid temperature.

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

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