How to Troubleshoot the Gauges
The Communication Line Check
While in the self-diagnostic mode, the Communication Line Check starts after the LCD Segments Check.
If all segments come on, the communication line are OK. If faulty, the word ‘‘ERROR'' will be indicated on the odometer display followed by number(s).
  • Error 1: F-CAN communication line error
  • Error 2: B-CAN communication line error
  • Error 3: UART communication line error

Error Code List

Error code
Type of communication line(s) error
ERROR 1
F-CAN communication
ERROR 2
B-CAN communication
ERROR 3
UART communication
ERROR 1.2
F-CAN and B-CAN communication
ERROR 1.3
F-CAN and UART communication
ERROR 2.3
B-CAN and UART communication
ERROR 1.2.3
F-CAN, B-CAN and UART communication

Example Indication
  • If the word ‘‘ERROR 1'' is indicated, there is a malfunction in the communication line between the gauge control module (tach) and the fast-controller area network (F-CAN). Check for DTCs in the ECM and troubleshoot any DTCs found. If no DTCs are found, go to indicated troubleshooting.
  • If the word ‘‘ERROR 2'' is indicated, there is a malfunction in the communication line between the gauge control module (tach) and the body-controller area network (B-CAN). Go to indicated troubleshooting (B1155 to B1160).
  • If the word ‘‘ERROR 3'' is indicated, there is a malfunction in the UART communication line between the gauge control module (tach) and the gauge control module (speedo). Go to the gauge control module (tach) input test and check the A20 terminal. If the wire harness is OK, substitute a known-good gauge control module (speedo) and recheck.
If any F-CAN or B-CAN communication line errors are found, go to DTC check using HDS.