DTC Troubleshooting: U0155
DTC U0155: F-CAN Malfunction (PCM-Gauge Control Module)
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
U0155 F-CAN Malfunction (PCM-Gauge Control Module)
      

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
U0155 F-CAN Malfunction (PCM-Gauge Control Module)
      

Is DTC U0155 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
2.
Gauge control module DTC check:

Gauge control module DTC check
?1.
Check for gauge control module DTCs with the HDS.
DTC Description
DTC
U0029 F-CAN communication line error
  
U0100 Gauge control module lost communication with ENG/AT
  

Is DTC U0029 and/or U0100 indicated?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Open wire check (F-CAN_H line):

Open wire check (F-CAN_H line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connectors.
PCM connector A (51P)
Gauge control module 32P connector

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
 
Gauge control module 32P connector: disconnected
Test point 1
Gauge control module 32P connector No. 21
Test point 2
PCM connector A (51P) No. 2

Is there continuity?

     
YES
     
     
     
The F-CAN_H wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the F-CAN_H wire between the PCM (A2) and the gauge control module.?
4.
Open wire check (F-CAN_L line):

Open wire check (F-CAN_L line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
 
Gauge control module 32P connector: disconnected
Test point 1
Gauge control module 32P connector No. 22
Test point 2
PCM connector A (51P) No. 1

Is there continuity?

     
YES
     
     
     
The F-CAN_L wire is OK. Substitute a known-good gauge control module, then recheck. If DTC U0155 is not indicated after substitution, replace the original gauge control module.?
     
NO
     
     
     
Repair an open in the F-CAN_L wire between the PCM (A1) and the gauge control module.?