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DTC Troubleshooting: U0047-00 (CAN Gateway) (2021 2022 2023 2024 2025)

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

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

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

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 

    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 (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 (50P)

    -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 , then recheck. If DTC U0047-00 goes away and the PCM was substituted, replace the original PCM .

  3. Shorted unit check (TCM)

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

    -2. Disconnect the following connector.

    TCM connector A (23P)

    -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 TCM , then recheck. If DTC U0047-00 goes away and the TCM was substituted, replace the original TCM .

  4. 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 46P 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 replace the VSA modulator-control unit .

  5. Shorted unit check (electric brake booster)

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

    -2. Disconnect the following connector.

    Electric brake booster 26P connector

    NOTE:  Before disconnecting the electric brake booster connector, turn the vehicle to the OFF (LOCK) mode with the driver's door opened, and wait 3 minutes. Do not close the driver's door.

    -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 replace the original electric brake booster .

  6. 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 7.

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

  7. Shorted wire check (F-CAN B_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
      PCM connector A (50P): disconnected
      TCM connector A (23P): disconnected
      VSA modulator-control unit 46P connector: disconnected
      Electric brake booster 26P connector: disconnected
      SBW shifter control module 20P connector: disconnected
      CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 6:
    Test point 2 Body ground
    GHH441540Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    Go to step 8.

    NO 

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

  8. 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 (50P): disconnected
      TCM connector A (23P): disconnected
      VSA modulator-control unit 46P connector: disconnected
      Electric brake booster 26P connector: disconnected
      SBW shifter control module 20P connector: disconnected
      CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 14:
    Test point 2 Body ground
    GHH441542Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    Go to step 9.

    NO 

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

  9. 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 (50P): disconnected
      TCM connector A (23P): disconnected
      VSA modulator-control unit 46P connector: disconnected
      Electric brake booster 26P connector: disconnected
      SBW shifter control module 20P connector: 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:
    GHH441545Courtesy 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 U0047-00 goes away and the CAN gateway was substituted, replace the original CAN gateway .

    NO 

    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.

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