DTC U0047-00 (CAN Gateway) (2019 2020)

DTC U0047-00  : CAN Gateway F-CAN ch B Bus Off

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to:

How to Troubleshoot the Fuel and Emissions Systems (2014-20) or

How to Troubleshoot the Fuel and Emissions Systems (With Auto Idle Stop System) (2016-20)

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
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time.

2. Shorted unit check (PCM)

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

   - 2. Jump the SCS line with the HDS, and wait more than 1 minute.

   - 3. Disconnect the following connector.

   PCM connector A (51P)

   - 4. Turn the vehicle to the ON mode.

   - 5. Clear the DTC with the HDS.

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

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

   - 8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 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 PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020) .

3. Shorted unit check (Engine mount control unit)

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

   - 2. Reconnect PCM connector A (51P).

   - 3. Disconnect the following connector.

   Engine mount control unit 16P connector

   - 4. Turn the vehicle to the ON mode.

   - 5. Clear the DTC with the HDS.

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

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

   - 8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 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 engine mount control unit .

4. Shorted unit check (TCM)

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

   - 2. Reconnect the engine mount control unit 16P connector.

   - 3. Disconnect the following connector.

   TCM 58P connector

   - 4. Turn the vehicle to the ON mode.

   - 5. Clear the DTC with the HDS.

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

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

   - 8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 indicated?

   YES 

   Go to step 5.

   NO 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good TCM .

5. Shorted unit check (SBW shifter control module)

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

   - 2. Reconnect the TCM 58P connector.

   - 3. Disconnect the following connector.

   SBW shifter control module 20P connector

   - 4. Turn the vehicle to the ON mode.

   - 5. Clear the DTC with the HDS.

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

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

   - 8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 indicated?

   YES 

   Go to step 6.

   NO 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the SBW shifter control module .

6. Shorted unit check (audio-navigation unit)

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

   - 2. Reconnect the SBW shifter control module 20P connector.

   - 3. Disconnect the following connector.

   Audio-navigation unit connector F (18P)

   - 4. Turn the vehicle to the ON mode.

   - 5. Clear the DTC with the HDS.

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

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

   - 8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 indicated?

   YES 

   Go to step 7.

   NO 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the audio-navigation unit .

7. Shorted unit check (ANC/active sound control unit)

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

   - 2. Reconnect audio-navigation unit connector F (18P).

   - 3. Disconnect the following connector.

   ANC/active sound control unit 20P connector

   - 4. Turn the vehicle to the ON mode.

   - 5. Clear the DTC with the HDS.

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

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

   - 8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 indicated?

   YES 

   Go to step 8.

   NO 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the ANC/active sound control unit .

8. Shorted unit check (VSA modulator-control unit)

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

   - 2. Reconnect the ANC/active sound control unit 20P connector.

   - 3. Disconnect the following connector.

   VSA modulator-control unit 38P connector

   - 4. Turn the vehicle to the ON mode.

   - 5. Clear the DTC with the HDS.

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

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

   - 8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 indicated?

   YES 

   Go to step 9.

   NO 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the VSA modulator-control unit .

9. Shorted unit check (adaptive damper control unit)

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

   - 2. Reconnect the VSA modulator-control unit 38P connector.

   - 3. Disconnect the following connector.

   Adaptive damper control unit 24P connector

   - 4. Turn the vehicle to the ON mode.

   - 5. Clear the DTC with the HDS.

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

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

   - 8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 indicated?

   1. YES 

      • Substitute a known-good keyless access/TPMS control unit , then recheck.
      • If the original keyless access/TPMS control unit is OK, go to step 10.

      NO 

      Substitute a known-good adaptive damper control unit .

10. Shorted wire check (F-CAN B_H line)

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

    - 2. Disconnect the following connectors.

    • PCM connector A (51P)
    • Engine mount control unit 16P connector
    • TCM 58P connector
    • SBW shifter control module 20P connector
    • Audio-navigation unit connector F (18P)
    • ANC/active sound control unit 20P connector
    • Keyless access/TPMS control unit connector C (20P)
    • VSA modulator-control unit 38P connector
    • Adaptive damper control unit 24P connector
    • CAN gateway 16P connector

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (51P): disconnected
    	Engine mount control unit 16P connector: disconnected
    	TCM 58P connector: disconnected
    	SBW shifter control module 20P connector: disconnected
    	Audio-navigation unit connector F (18P): disconnected
    	ANC/active sound control unit 20P connector: disconnected
    	VSA modulator-control unit 38P connector: disconnected
    	Keyless access/TPMS control unit connector C (20P): disconnected
    	Adaptive damper control unit 24P connector
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 6:
    Test point 2	Body ground

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

    Is there continuity?

    YES 

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

    NO 

    The F-CAN B_H wire is not shorted to ground. Go to step 11.

11. Shorted wire check (F-CAN B_L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (51P): disconnected
    	Engine mount control unit 16P connector: disconnected
    	TCM 58P connector: disconnected
    	SBW shifter control module 20P connector: disconnected
    	Audio-navigation unit connector F (18P): disconnected
    	ANC/active sound control unit 20P connector: disconnected
    	VSA modulator-control unit 38P connector: disconnected
    	Keyless access/TPMS control unit connector C (20P): disconnected
    	Adaptive damper control unit 24P connector
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 14:
    Test point 2	Body ground

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

    Is there continuity?

    YES 

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

    NO 

    The F-CAN B_L wire is not shorted to ground. Go to step 12.

12. Shorted wire check (F-CAN B_H line to F-CAN B_L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (51P): disconnected
    	Engine mount control unit 16P connector: disconnected
    	TCM 58P connector: disconnected
    	SBW shifter control module 20P connector: disconnected
    	Audio-navigation unit connector F (18P): disconnected
    	ANC/active sound control unit 20P connector: disconnected
    	VSA modulator-control unit 38P connector: disconnected
    	Keyless access/TPMS control unit connector C (20P): disconnected
    	Adaptive damper control unit 24P connector
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 6:
    Test point 2	CAN gateway 16P connector (female terminals) No. 14:

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

    Is there continuity?

    YES 

    Repair a short in the F-CAN B_H wire to the F-CAN B_L wire between CAN gateway terminals No. 6 and No. 14.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the CAN gateway .