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ELECTRICAL 34 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 2 U0028 88 Vehicle Communic ation Bus A - bus off Immediate 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. Short circuit failure between CAN High and CAN Low lines. 2. Short circuit failure between CAN Low and Battery lines. 3. Short circuit failure between CAN High and Ground line 1. Check CAN wiring harness for short circuit failure(s). 2. Measure resistance between CAN High (OBD Connector) and CAN Low (OBD Connector) lines to detect short circuit failure. 3. Measure resistance between CAN Low (OBD Connector) and Battery lines (OBD Connector) to detect short circuit failure. 4. Measure resistance between CAN High (OBD Connector) and Ground lines (OBD Connector) to detect short circuit failure. 5. If measured resistance is in the range of 0 to 10 ohm, then any one of the short circuit failure is present. 6. Repair the wiring harness.