DTC Troubleshooting: U0155
DTC U0155: Lost Communication With Gauge Control Module
DTC Description
DTC
U0155 Lost communication with Gauge Control Module
  

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

1.
Problem verification:

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


?2.
Press the engine start/stop button to select the OFF mode and then the ON mode.

?3.
Wait for at least 6 seconds.

?4.
Check for DTCs with the HDS.
DTC Description
DTC
U0155 Lost communication with Gauge Control Module
  

Is DTC U0155 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
Determine possible failure area (gauge control module power and ground, B-CAN line):

Determine possible failure area (gauge control module power and ground, B-CAN line)
?1.
Select B-CAN CONTROL UNITS INFORMATION from the BODY ELECTRICAL SYSTEM SELECT menu, and then select CHECK CONNECTED CONTROL UNITS.

?2.
Check the DETECT/NOT AVAILABLE information of the GAUGE CONTROL MODULE.

Is DETECT indicated?

     
YES
     
     
     
Go to step 8.
     
NO
     
     
     
Go to step 3.
3.
Fuse check:

Fuse check
?1.
Check the following fuses.
Fuse
No. A21 (10 A)
Location
Under-hood fuse/relay box

Fuse
No. B5 (7.5 A)
Location
Under-dash fuse/relay box

Is each fuse OK?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Replace the fuse. If the fuse blows again, repair a short to ground in the No. A21 (10 A) and/or No. B5 (7.5 A) fuse circuit(s).?
4.
Open wire check (+B BACK UP line):

Open wire check (+B BACK UP line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Measure the voltage between test points 1 and 2.
Test condition
OFF mode
Gauge control module connector A (32P): disconnected
Test circuit
+B BACK UP
Test point 1
Gauge control module connector A (32P) No. 1 (WHT)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The +B BACK UP wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
5.
Open wire check (IG1 METER line):

Open wire check (IG1 METER line)
?1.
Press the engine start/stop button to select the ON mode.

?2.
Measure the voltage between test points 1 and 2.
Test condition
ON mode
Gauge control module connector A (32P): disconnected
Test circuit
IG1 METER
Test point 1
Gauge control module connector A (32P) No. 17 (BRN)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The IG1 METER wire is OK. Go to step 6.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
6.
Open wire check (GND lines):

Open wire check (GND lines)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Check for continuity between test points 1 and 2 individually.
Test condition
OFF mode
Gauge control module connector A (32P): disconnected
Test circuit
GND
Test point 1
Gauge control module connector A (32P) No. 4 (BRN)
Test point 2
Body ground

Test circuit
GND
Test point 1
Gauge control module connector A (32P) No. 32 (BRN)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The GND wire is OK. Go to step 7.
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G502).?
7.
Open wire check (B-CAN lines):

Open wire check (B-CAN lines)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
Gauge control module connector A (32P): disconnected
Parking and back-up sensor control unit 24P connector: disconnected
Test circuit
B-CAN_H
Test point 1
Parking and back-up sensor control unit 24P connector No. 22 (PNK)
Test point 2
Gauge control module connector A (32P) No. 30 (PNK)


Is there continuity?

     
YES
     
     
     
An open or poor connection in the B-CAN_L wire between the parking and back-up sensor control unit and the gauge control module.?
     
NO
     
     
     
An open or poor connection in the B-CAN_H wire between the parking and back-up sensor control unit and the gauge control module.?
8.
Open wire check (B-CAN lines):

Open wire check (B-CAN lines)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connectors.

?3.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
Parking and back-up sensor control unit 24P connector: disconnected
Gauge control module connector A (32P): disconnected
Test circuit
B-CAN_H
Test point 1
Parking and back-up sensor control unit 24P connector No. 22 (PNK)
Test point 2
Gauge control module connector A (32P) No. 30 (PNK)


Is there continuity?

     
YES
     
     
     
An open or poor connection in the B-CAN_L wire between the parking and back-up sensor control unit and the gauge control module.?
     
NO
     
     
     
An open or poor connection in the B-CAN_H wire between the parking and back-up sensor control unit and the gauge control module.?