DTC U0047-00: CAN Gateway F-CAN ch B Bus Off (CAN Gateway (V6)) (2018-19)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Dual Clutch Transmission (DCT), or How to Troubleshoot the Brake Booster Pressure Monitoring System (With Auto Idle Stop System), or How to Troubleshoot the Fuel and Emissions Systems (V6, Without Auto Idle Stop System), or How to Troubleshoot the Fuel and Emissions Systems (V6, With Auto Idle Stop System) .

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 (With SH-AWD), or PCM Removal and Installation (Without SH-AWD) .

3. Shorted unit check (engine mount control unit)

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

   - 2. Disconnect the following connector.

   Engine mount control unit 16P 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
   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. Disconnect the following connector.

   TCM 58P 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
   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. Disconnect the following connector.

   SBW shifter control module 20P 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
   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 Substitute a known-good SBW shifter control module .

6. Shorted unit check (audio-navigation unit)

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

   - 2. Disconnect the following connector.

   Audio-navigation unit connector F (18P)

   - 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
   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 Substitute a known-good audio-navigation unit .

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

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

   - 2. Disconnect the following connector.

   ANC/active sound control unit 20P 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
   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 Substitute a known-good ANC/active sound control unit .

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

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

   - 2. Disconnect the following connector.

   VSA modulator-control unit 38P 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
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 indicated?

   YES (With SH-AWD system)

   Go to step 9.

   YES (Without SH-AWD system)

   • Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or 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 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good VSA modulator-control unit - Refer to: VSA Modulator-Control Unit Removal and Installation (With SH-AWD), or VSA Modulator-Control Unit Removal and Installation .

9. Shorted unit check (SH-AWD control unit)

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

   - 2. Disconnect the following connector.

   SH-AWD control unit 24P 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
   U0047-00 CAN Gateway F-CAN ch B Bus Off

   Is DTC U0047-00 indicated?

   1. YES 

      • Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or 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 

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

    Keyless access/TPMS control unit connector C (20P)

    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
    	SH-AWD control unit 24P connector: disconnected
    	Keyless access/TPMS control unit connector C (20P): disconnected
    	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
    	SH-AWD control unit 24P connector: disconnected
    	Keyless access/TPMS control unit connector C (20P): disconnected
    	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
    	SH-AWD control unit 24P connector: disconnected
    	Keyless access/TPMS control unit connector C (20P): disconnected
    	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 substitute a known-good CAN gateway .