DTC U0128 (Gauge Control Module (With CAN Gateway)) (2019 2020)

DTC U0128  : Gauge control module lost communication with EPB

DTC (Gauge Control Module)

1. 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
   U0128 Gauge control module lost communication with EPB

   Is DTC U0128 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. 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
   U3000-49 CAN Gateway Internal Failure

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

   YES 

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

   NO 

   Go to step 3.

3. 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?

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

   Go to step 4.

   GAUGE CONTROL MODULE (Bus A) is Not Available

   Go to step 6.

   ELECTRIC PARKING BRAKE CONTROL UNIT and GAUGE CONTROL MODULE 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.

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

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

   - 2. Disconnect the following connectors.

   CAN gateway 16P connector

   Electric parking brake control unit 30P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	Electric parking brake control unit 30P connector: disconnected
   Test point 1	CAN gateway 16P connector No. 3
   Test point 2	Electric parking brake control unit 30P connector No. 30

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

   Is there continuity?

   YES 

   The F-CAN A_H wire is OK. Go to step 5.

   NO 

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

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	Electric parking brake control unit 30P connector: disconnected
   Test point 1	CAN gateway 16P connector No. 11
   Test point 2	Electric parking brake control unit 30P connector No. 29

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

   Is there continuity?

   YES 

   The F-CAN A_L wire is OK. Replace the electric parking brake control unit .

   NO 

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

6. 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 16P 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 16P connector: disconnected
   Test point 1	Gauge control module connector A (32P) No. 27 - Refer to: Gauge Control Module Input Test (2017 2018 2019 2020)
   Test point 2	CAN gateway 16P connector No. 3

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

   Is there continuity?

   YES 

   The F-CAN A_H wire is OK. Go to step 7.

   NO 

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

7. 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 16P connector: disconnected
   Test point 1	Gauge control module connector A (32P) No. 28 - Refer to: Gauge Control Module Input Test (2017 2018 2019 2020)
   Test point 2	CAN gateway 16P connector No. 11

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

   Is there continuity?

   YES 

   The F-CAN A_L wire is OK. Replace the gauge control module .

   NO 

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