A/T System

DTC Troubleshooting: U0155 (107) (A/T System)

DTC U0155: F-CAN Malfunction (PCM-to-Gauge Control Module)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information. How to Troubleshoot A/T Systems

1. Clear the DTC with the HDS.

2. Turn the ignition switch to ON (II).

3. Check whether DTC U0155 is indicated in the DTCs/Freeze Data in PGM-FI Mode Menu with the HDS.

Is DTC U0155 indicated in the PGM-FI system?
YES - Troubleshoot for DTC U0155 in the PGM-FI System. U0155

NO - Go to step 4.


4. Check whether DTC U0155 is indicated in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

Is DTC U0155 indicated?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time.


5. Update the A/T software in the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. How to Troubleshoot A/T Systems

6. Start the engine, and let it idle for 2 minutes.

7. Check for Temporary DTCs or DTCs with the HDS.

Is DTC U0155 indicated?
YES - If the PCM was updated, substitute a known-good PCM, How to Troubleshoot A/T Systems then recheck. If the PCM was substituted, go to step 1.

NO - Go to step 8.


8. Monitor the OBD STATUS for U0155 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?
YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. Service and Repair If any other DTCs were indicated on step 7, go to the indicated DTC's troubleshooting.

NO - Check for poor connections and loose terminals at the gauge control module and the PCM. If the PCM was updated, substitute a known-good PCM, How to Troubleshoot A/T Systems then recheck. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.