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DTC U0056-00 (2018 2019 2020)

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

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

DTC Description DTC
U0056-00 CAN Gateway F-CAN ch C 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
    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.

  2. 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
    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 replace the VSA modulator-control unit .

  3. Shorted unit check (steering angle sensor)

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

    -2. Disconnect the following connector.

    Steering angle sensor 4P 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 

    Substitute a known-good steering angle sensor , then recheck. If DTC U0056-00 goes away and the steering angle sensor was substituted, replace the original steering angle sensor .

  4. Shorted unit check (EPS control unit)

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

    -2. Disconnect the following connector.

    EPS control unit connector B (6P)

    -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 

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

  5. Shorted unit check (precision all wheel steer control unit)

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

    -2. Disconnect the following connector.

    Precision all wheel steer control unit connector A (16P)

    -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 6.

    NO 

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

  6. Shorted unit check (multipurpose camera unit)

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

    -2. Disconnect the following connector.

    Multipurpose camera 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
    U0056-00 CAN Gateway F-CAN ch C Bus Off  

    Is DTC U0056-00 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 multipurpose camera unit , then recheck. If DTC U0056-00 goes away and the multipurpose camera unit was substituted, replace the original multipurpose camera unit .

  7. Shorted unit check (SRS unit)

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

    -2. Do the battery terminal disconnection procedure , then wait at least 3 minutes.

    -3. Disconnect the following connector.

    SRS unit connector A (39P)

    -4. Do the battery terminal reconnection procedure .

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

    Is DTC U0056-00 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 SRS unit , then recheck. If DTC U0056-00 goes way and the SRS unit was substituted, replace the original SRS unit .

  8. Shorted unit check (E-pretensioner unit)

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

    -2. Do the battery terminal disconnection procedure , then wait at least 3 minutes.

    -3. Disconnect the following connectors.

    E-pretensioner unit connector A (16P)
    E-pretensioner unit connector B (14P)

    -4. Do the battery terminal reconnection procedure .

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

    Is DTC U0056-00 indicated?

    YES 

    Go to step 9.

    NO 

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

  9. 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
      VSA modulator-control unit 38P connector: disconnected
      Steering angle sensor 4P connector: disconnected
      EPS control unit connector B (6P): disconnected
      Precision all wheel steer control unit connector A (16P): disconnected
      Multipurpose camera unit 20P connector: disconnected
      SRS unit connector A (39P): disconnected
      E-pretensioner unit connector A (16P): disconnected
      E-pretensioner unit connector B (14P): disconnected
      CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 5:
    Test point 2 Body ground
    GHH342771Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

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

    NO 

    The F-CAN C_H wire is not short to ground. Go to step 10.

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

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

    Test condition Vehicle OFF (LOCK) mode
      VSA modulator-control unit 38P connector: disconnected
      Steering angle sensor 4P connector: disconnected
      EPS control unit connector B (6P): disconnected
      Precision all wheel steer control unit connector A (16P): disconnected
      Multipurpose camera unit 20P connector: disconnected
      SRS unit connector A (39P): disconnected
      E-pretensioner unit connector A (16P): disconnected
      E-pretensioner unit connector B (14P): disconnected
      CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 13:
    Test point 2 Body ground
    GHH342773Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

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

    NO 

    The F-CAN C_L wire is not short to ground. Go to step 11.

  11. 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
      VSA modulator-control unit 38P connector: disconnected
      Steering angle sensor 4P connector: disconnected
      EPS control unit connector B (6P): disconnected
      Precision all wheel steer control unit connector A (16P): disconnected
      Multipurpose camera unit 20P connector: disconnected
      SRS unit connector A (39P): disconnected
      E-pretensioner unit connector A (16P): disconnected
      E-pretensioner unit connector B (14P): 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:
    GHH342776Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    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.

    NO 

    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 way and the CAN gateway was substituted, replace the original CAN gateway .

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