ELECTRICAL 33 2.8 DIAGNOSTIC TROUBLE CODES – INSTRUMENT CLUSTER Sr No DTC Code DTC Descriptio n Minimum Time for Fault Setting / Tester Visibility, Assuming Fault was created while Ignition was OFF Impact on customer Probable cause Investigation/Rectificati on/Repair action 1 U0028 13 Vehicle Communic ation Bus A - circuit open 600ms EPAS lamp ON, CE Lamp ON, MIL Lamp ON. Default steering assistance, EMS will go into default mode. Gear cannot be changed. TCM will go into default mode. TCM Lamp ON 1. Open circuit failure of CAN High line at IPC wiring harness connector. 2. Open circuit failure of CAN low line at IPC wiring harness connector. 3. Open CAN High or Low line terminal back out at IPC wiring harness connector. 1. Check resistance between CAN H and CAN L line at OBD connector. 2. If measured resistance is in the range 11 to 130ohm, then either IPC or ECM CAN lines are not connected properly in vehicle. 3. Repair the wiring harness.
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