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
 

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

NOTE: If you have any loss of communication DTCs for the PCM, troubleshoot those DTCs first.

1.
Problem verification:

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

?2.
Clear the DTCs with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?4.
Wait for at least 6 seconds.

?5.
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.
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 respectively.
Test condition
Vehicle OFF (LOCK) mode
PCM connector A (51P): disconnected
Gauge control module 32P connector: disconnected
Test point 1
Test point 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 wire(s).?