DTC U0128 (Gauge Control Module) (2014 2015 2016 2017)

DTC U0128  : Gauge Control Module Lost Communication With Electric Parking Brake Control Unit

DTC (Gauge Control Module)

NOTE:  Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information .

1. CAN gateway system DTC check

   -1. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off
   U0047-00 CAN Gateway F-CAN ch B Bus Off
   U0056-00 CAN Gateway F-CAN ch C Bus Off
   U3000-49 CAN Gateway Internal Failure

   Is DTC U0029-00, U0047-00, U0056-00, and/or U3000-49 indicated?

   YES 

   Go to the troubleshooting for CAN gateway system DTC (s) .

   NO 

   Go to step 2.

2. F-CAN circuit communication check

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   F-CAN Bus Connected Unit Check

   Which result is indicated?

   GAUGE CONTROL MODULE (Bus A) is Not Available

   Go to step 3.

   ELECTRIC PARKING BRAKE CONTROL UNIT (Bus B) is Not Available

   Go to step 5.

   GAUGE CONTROL MODULE and ELECTRIC PARKING BRAKE CONTROL UNIT are Detected

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the CAN gateway, and the electric parking brake control unit.

3. Open wire check (F-CAN A_H line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connectors.

   Gauge control module connector A (32P)

   CAN gateway 24P connector

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Gauge control module connector A (32P): disconnected
   	CAN gateway 24P connector: disconnected
   Test circuit	F-CAN A_H
   Test point 1	Gauge control module connector A (32P) No. 27 (BLU)
   Test point 2	CAN gateway 24P connector No. 14 (BLU)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The F-CAN A_H wire is OK. Go to step 4.

   NO 

   Repair an open in the F-CAN A_H wire between the gauge control module and the CAN gateway.

4. Open wire check (F-CAN A_L line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Gauge control module connector A (32P): disconnected
   	CAN gateway 24P connector: disconnected
   Test circuit	F-CAN A_L
   Test point 1	Gauge control module connector A (32P) No. 28 (PNK)
   Test point 2	CAN gateway 24P connector No. 15 (PNK)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the gauge control module. Substitute a good-known gauge control module , then recheck. If DTC U0128 is not indicated the gauge control module was substituted, replace the original gauge control module .

   NO 

   Repair an open in the F-CAN A_L wire between the gauge control module and the CAN gateway.

5. Open wire check (F-CAN B_H line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connectors.

   Electric parking brake control unit 30P connector

   CAN gateway 24P connector

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric parking brake control unit 30P connector: disconnected
   	CAN gateway 24P connector: disconnected
   Test circuit	F-CAN B_H
   Test point 1	Electric parking brake control unit 30P connector No. 30 (LT BLU)
   Test point 2	CAN gateway 24P connector No. 11 (LT BLU)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The F-CAN B_H wire is OK. Go to step 6.

   NO 

   Repair an open in the F-CAN B_H wire between the electric parking brake control unit and the CAN gateway.

6. Open wire check (F-CAN B_L line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric parking brake control unit 30P connector: disconnected
   	CAN gateway 24P connector: disconnected
   Test circuit	F-CAN B_L
   Test point 1	Electric parking brake control unit 30P connector: No. 29 (GRY)
   Test point 2	CAN gateway 24P connector No. 10 (GRY)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The F-CAN B_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the electric parking brake control unit. Update the electric parking brake control unit if it does not have the latest software, or substitute a known-good electric parking brake control unit , then recheck. If DTC U0128 goes away and the electric parking brake control unit was updated, troubleshooting is complete. If DTC U0128 goes away and the electric parking brake control unit was substituted, replace the original electric parking brake control unit .

   NO 

   Repair an open in the F-CAN B_L wire between the electric parking brake control unit and the CAN gateway.