DTC Troubleshooting: U0056-00(CAN Gateway) (2021 2022 2023 2024 2025)

DTC U0056-00  : CAN Gateway F-CAN ch C Bus Off

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (CAN GATEWAY)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the ON mode, and wait 6 seconds.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

2. Shorted unit check (gauge control module)

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

   -2. Disconnect the following connector.

   Gauge control module connector A (32P)

   -3. Turn the vehicle to the ON mode.

   -4. Clear the DTC with the HDS.

   -5. Turn the vehicle to the OFF (LOCK) mode.

   -6. Turn the vehicle to the ON mode, and wait 6 seconds.

   -7. Check for DTCs with the HDS.

   DTC Description	DTC
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 indicated?

   YES 

   Go to step 3.

   NO 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good gauge control module , then recheck. If DTC U0056-00 goes away and the gauge control module was substituted, replace the original gauge control module .

3. Shorted unit check (multipurpose camera unit)

   -1. Turn the vehicle to the OFF (LOCK) mode, and wait 3 seconds or more.

   -2. Disconnect the following connector.

   Multipurpose camera unit 12P connector

   -3. Turn the vehicle to the ON mode.

   -4. Clear the DTC with the HDS.

   -5. Turn the vehicle to the OFF (LOCK) mode.

   -6. Turn the vehicle to the ON mode, and wait 6 seconds.

   -7. Check for DTCs with the HDS.

   DTC Description	DTC
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 indicated?

   YES 

   Go to step 4.

   NO 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good multipurpose camera unit , then recheck. If DTC U0056-00 goes away and the multipurpose camera unit was substituted, replace the original multipurpose camera unit .

4. Shorted unit check (millimeter wave radar)

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

   -2. Disconnect the following connector.

   Millimeter wave radar 8P connector

   -3. Turn the vehicle to the ON mode.

   -4. Clear the DTC with the HDS.

   -5. Turn the vehicle to the OFF (LOCK) mode.

   -6. Turn the vehicle to the ON mode, and wait 6 seconds.

   -7. Check for DTCs with the HDS.

   DTC Description	DTC
   U0056-00 CAN Gateway F-CAN ch C Bus Off

   Is DTC U0056-00 indicated?

   YES 

   Go to step 5.

   NO 

   Substitute a known-good millimeter wave radar , then recheck. If DTC U0056-00 goes away and the millimeter wave radar was substituted, replace the original millimeter wave radar .

5. Shorted wire check (F-CAN C_H line)

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

   -2. Disconnect the following connector.

   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
   	Multipurpose camera unit 12P connector: disconnected

   	Millimeter wave radar 8P connector: disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 5:
   Test point 2	Body ground

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

   Is there 1 MΩ or more?

   YES 

   Go to step 6.

   NO 

   Repair a short in the F-CAN C_H wire between the CAN gateway and the connected units.

6. Shorted wire check (F-CAN C_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
   	Multipurpose camera unit 12P connector: disconnected
   	Millimeter wave radar 8P connector: disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 13:
   Test point 2	Body ground

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

   Is there 1 MΩ or more?

   YES 

   Go to step 7.

   NO 

   Repair a short in the F-CAN C_L wire between the CAN gateway and the connected units.

7. Shorted wire check (F-CAN C_H line to F-CAN C_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
   	Multipurpose camera unit 12P connector: disconnected
   	Millimeter wave radar 8P connector: disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 5:
   Test point 2	CAN gateway 16P connector (female terminals) No. 13:

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

   Is there 1 MΩ or more?

   YES 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good CAN gateway , then recheck. If DTC U0056-00 goes away and the CAN gateway was substituted, replace the original CAN gateway .

   NO 

   Repair a short in the F-CAN C_H wire to the F-CAN C_L wire between CAN gateway terminals No. 5 and No. 13.