DTC U0047-00 (CAN Gateway) (2016 2017 2018)

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.

   - 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 

   Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020), then recheck. If DTC U0047-00 goes away and the PCM was updated, troubleshooting is complete. If DTC U0047-00 goes away and the PCM was substituted, replace the original 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. Jump the SCS line with the HDS.

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

   - 4. Disconnect the following connector.

   Engine mount control unit 16P connector

   - 5. Turn the vehicle to the ON mode.

   - 6. Clear the DTC with the HDS.

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

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

   - 9. 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 

   Substitute a known-good engine mount control unit , then recheck. If DTC U0047-00 goes away and the engine mount control unit was substituted, replace the original 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 

   Update the TCM if it does not have the latest software, or substitute a known-good TCM , then recheck. If DTC U0047-00 goes away and the TCM was updated, troubleshooting is complete. If DTC U0047-00 goes away and the TCM was substituted, replace the original 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 

   Substitute a known-good SBW shifter control module , then recheck. If DTC U0047-00 goes away and the SBW shifter control module was substituted, replace the original 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 

   Substitute a known-good audio-navigation unit , then recheck. If DTC U0047-00 goes away and the audio-navigation unit was substituted, replace the original 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 

   Substitute a known-good ANC/active sound control unit , then recheck. If DTC U0047-00 goes away and the ANC/active sound control unit was substituted, replace the original 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?

   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 9.

      NO 

      Update the VSA modulator-control unit if it does not have the latest software, then recheck. If DTC U0047-00 goes away and the VSA modulator-control unit was updated, troubleshooting is complete. If DTC U0047-00 is indicated after the VSA modulator-control unit was updated, replace the VSA modulator-control unit .

9. 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) - Refer to: PCM Removal and Installation (2016 2017 2018 2019 2020)
   • 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
   • VSA modulator-control unit 38P connector
   • Keyless access/TPMS control unit connector C (20P)
   • CAN gateway 24P 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
   	CAN gateway 24P connector: disconnected
   Test point 1	CAN gateway 24P connector No. 11
   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 10.

10. 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
    	CAN gateway 24P connector: disconnected
    Test point 1	CAN gateway 24P connector No. 10
    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 11.

11. 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
    	CAN gateway 24P connector: disconnected
    Test point 1	CAN gateway 24P connector No. 10
    Test point 2	CAN gateway 24P connector No. 11

    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. 10 and No. 11.

    NO 

    Update the CAN gateway if it does not have the latest software, or substitute a known-good CAN gateway , then recheck. If DTC U0047-00 goes away and the CAN gateway was updated, troubleshooting is complete. If DTC U0047-00 goes away and the CAN gateway was substituted, replace the original CAN gateway .