CVT System

DTC Troubleshooting: U0029 (107), U0122 (107), U0155 (107), U1205 (120)

DTC U0029:

F-CAN Malfunction (F-CAN Bus OFF)

DTC U0122:

Lost Communication With Vehicle Dynamics Control Module

DTC U0155:

Lost Communication With Gauge Control Module

DTC U1205:

IMA-CAN Malfunction (PCM-to-Motor Control Module)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review the General Troubleshooting Information Initial Inspection and Diagnostic Overview.

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

2. Clear the DTC with the HDS.

3. Check for Pending or Confirmed DTCs in the PGM-FI SYSTEM with the HDS.

Is DTC U0029, U0122, U0155, or U1205 indicated in the PGM-FI SYSTEM?

YES -

Go to the DTC U0029 troubleshooting PGM-FI System, DTC U0122 troubleshooting PGM-FI System, DTC U0155 troubleshooting PGM-FI System, or DTC U1205 troubleshooting PGM-FI System in Communication Systems.

NO -

Go to step 4.

4. Check for Pending or Confirmed DTCs in the A/T SYSTEM with the HDS.

Is DTC U0029, U0122, U0155, or U1205 indicated in the A/T SYSTEM?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.

5. Update the PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good PCM.

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

7. Check for Pending or Confirmed DTCs the A/T SYSTEM with the HDS.

Is DTC U0029, U0122, U0155, or U1205 indicated in the A/T SYSTEM?

YES -

Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 6. If the PCM was substituted, go to step 1.

NO -

Go to step 8.

8. Monitor the OBD STATUS for U0029, U0122, U0155, or U1205 in the DTCs MENU with the HDS.

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 Pending or Confirmed DTCs were indicated in step 7, go to the indicated DTC's troubleshooting.

NO -

If the HDS indicates FAILED, check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 6.