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 ‘‘· · ·'' is indicated, 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 line error
Error 2
B-CAN communication line error
Error 3
UART communication line error
Error 1, 2
F-CAN and B-CAN communication lines error
Error 1, 3
F-CAN and UART communication lines error
Error 2, 3
B-CAN and UART communication lines error
Error 1, 2, 3
F-CAN, B-CAN and UART communication lines error

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 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 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 No. 20 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, check for DTCs with the HDS.