DTC Troubleshooting: U0100
DTC U0100: Gauge Control Module Lost Communication With ENG/AT
DTC Description
DTC
U0100 Gauge control module lost communication with ENG/AT
  
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
If you have any loss of communication DTCs for the PCM, troubleshoot those DTCs first.
1.
Problem verification:

Problem verification
?1.
Clear the DTCs with the HDS.


?2.
Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?3.
Wait for at least 6 seconds.

?4.
Check for DTCs with the HDS.
DTC Description
DTC
U0100 Gauge control module lost communication with ENG/AT
  

Is DTC U0100 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
Open wire check (F-CAN lines):

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

?2.
Wait for at least 2 minutes.

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

?4.
Check for continuity between test points 1 and 2 respectively.
Test condition
Vehicle OFF (LOCK) mode
PCM connector No. 2 (58P): disconnected
Gauge control module connector A (32P): disconnected
Test point 1
Gauge control module connector A (32P) No. 19
Test point 2
PCM Connector A (51P) No. 2


Is there continuity?

     
YES
     
     
     
The F-CAN wires are OK. Replace the gauge control module.?
     
NO
     
     
     
An open or poor connection in the F-CAN wires between the PCM and the gauge control module.?