DTC U0029-00 (CAN Gateway) (2016)

DTC U0029-00  : CAN Gateway F-CAN ch A Bus Off

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Fuel and Emissions Systems (With Auto Idle Stop System) (2016 2017 2018 2019 2020) .

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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 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 U0029-00 goes away and the PCM was updated, troubleshooting is complete. If DTC U0029-00 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 (gauge control module)

   - 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.

   Gauge control module 32P 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 4.

   NO 

   Substitute a known-good gauge control module , then recheck. If DTC U0029-00 goes away and the gauge control module was substituted, replace the original gauge control module .

4. Shorted unit check (TCM)

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

   - 2. Reconnect the gauge control module 32P 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 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 U0029-00 goes away and the TCM was updated, troubleshooting is complete. If DTC U0029-00 goes away and the TCM was substituted, replace the original TCM .

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

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

   - 2. Reconnect the TCM 58P 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 6.

   NO 

   Update the VSA modulator-control unit if it does not have the latest software, then recheck. If DTC U0029-00 goes away and the VSA modulator-control unit was updated, troubleshooting is complete. If DTC U0029-00 is indicated after the VSA modulator-control unit was updated, replace the VSA modulator-control unit .

6. Shorted unit check (SH-AWD 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.

   SH-AWD 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 7.

   NO 

   Update the SH-AWD control unit - Refer to: SH-AWD ® Control Unit Update (2016 2017 2018 2019 2020) if it does not have the latest software, or substitute a known-good SH-AWD control unit - Refer to: SH-AWD ® Control Unit Removal and Installation (SH-AWD) (2016 2017 2018 2019 2020) , then recheck. If DTC U0029-00 goes away and the SH-AWD control unit was updated, troubleshooting is complete. If DTC U0029-00 goes away and the SH-AWD control unit was substituted, replace the original SH-AWD control unit - Refer to: SH-AWD ® Control Unit Removal and Installation (SH-AWD) (2016 2017 2018 2019 2020) .

7. Shorted unit check (SBW shifter control module)

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

   - 2. Reconnect the SH-AWD control unit 24P 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 8.

   NO 

   Substitute a known-good SBW shifter control module , then recheck. If DTC U0029-00 goes away and the SBW shifter control module was substituted, replace the original SBW shifter control module .

8. Shorted unit check (EPS control unit)

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

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

   - 3. Disconnect the following connector.

   EPS control unit connector A (11P)

   - 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 9.

   NO 

   Update the EPS control unit if it does not have the latest software, then recheck. If DTC U0029-00 goes away and the EPS control unit was updated, troubleshooting is complete. If DTC U0029-00 is indicated after the EPS control unit was updated, replace the EPS control unit .

9. Shorted unit check (steering angle sensor)

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

   - 2. Reconnect EPS control unit connector A (11P).

   - 3. Disconnect the following connector.

   Steering angle sensor 4P 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 10.

   NO 

   Substitute a known-good steering angle sensor , then recheck. If DTC U0029-00 goes away and the steering angle sensor was substituted, replace the original steering angle sensor .

10. Shorted unit check (multipurpose camera unit)

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

    - 2. Reconnect the steering angle sensor 4P connector.

    - 3. Disconnect the following connector.

    Multipurpose camera 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
    U0029-00 CAN Gateway F-CAN ch A Bus Off

    Is DTC U0029-00 indicated?

    YES 

    Go to step 11.

    NO 

    Update the multipurpose camera unit if it does not have the latest software, or substitute a known-good multipurpose camera unit , then recheck. If DTC U0029-00 goes away and the multipurpose camera unit was updated, troubleshooting is complete. If DTC U0029-00 goes away and the multipurpose camera unit was substituted, replace the original multipurpose camera unit .

11. Shorted unit check (SRS unit)

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

    - 2. Reconnect the Multipurpose camera unit 20P connector.

    - 3. Do the 12 volt battery terminal disconnection procedure, and wait for at least 3 minutes.

    - 4. Disconnect the following connector.

    SRS unit connector A (39P)

    - 5. Do the 12 volt battery terminal reconnection procedure.

    - 6. Turn the vehicle to the ON mode.

    - 7. Clear the DTC with the HDS.

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

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

    - 10.Check for DTCs with the HDS.

    DTC Description	DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off

    Is DTC U0029-00 indicated?

    YES 

    Go to step 12.

    NO 

    Update the SRS unit if it does not have the latest software, or substitute a known-good SRS unit - Refer to: SRS Unit Removal and Installation (2014 2015 2016) , then recheck. If DTC U0029-00 goes away and the SRS unit was updated, troubleshooting is complete. If DTC U0029-00 goes away and the SRS unit was substituted, replace the original SRS unit - Refer to: SRS Unit Removal and Installation (2014 2015 2016) .

12. Shorted unit check (Driver's E-pretensioner unit)

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

    - 2. Reconnect SRS unit connector A (39P).

    - 3. Do the 12 volt battery terminal disconnection procedure, and wait for at least 3 minutes.

    - 4. Disconnect the following connector.

    Driver's E-pretensioner unit 16P connector

    - 5. Do the 12 volt battery terminal reconnection procedure.

    - 6. Turn the vehicle to the ON mode.

    - 7. Clear the DTC with the HDS.

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

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

    - 10.Check for DTCs with the HDS.

    DTC Description	DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off

    Is DTC U0029-00 indicated?

    YES 

    Go to step 13.

    NO 

    Update the E-pretensioner unit if it does not have the latest software, or substitute a known-good driver's E-pretensioner unit , then recheck. If DTC U0029-00 goes away and the driver's E-pretensioner unit was updated, troubleshooting is complete. If DTC U0029-00 goes away and the driver's E-pretensioner unit was substituted, replace the original driver's E-pretensioner unit .

13. Shorted unit check (Front passenger's E-pretensioner unit)

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

    - 2. Reconnect the driver's E-pretensioner unit 16P connector.

    - 3. Do the 12 volt battery terminal disconnection procedure, and wait for at least 3 minutes.

    - 4. Disconnect the following connector.

    Front passenger's E-pretensioner unit 14P connector

    - 5. Do the 12 volt battery terminal reconnection procedure.

    - 6. Turn the vehicle to the ON mode.

    - 7. Clear the DTC with the HDS.

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

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

    - 10.Check for DTCs with the HDS.

    DTC Description	DTC
    U0029-00 CAN Gateway F-CAN ch A Bus Off

    Is DTC U0029-00 indicated?

    YES 

    Go to step 14.

    NO 

    Update the E-pretensioner unit if it does not have the latest software, or substitute a known-good front passenger's E-pretensioner unit , then recheck. If DTC U0029-00 goes away and the front passenger's E-pretensioner unit was updated, troubleshooting is complete. If DTC U0029-00 goes away and the front passenger's E-pretensioner unit was substituted, replace the original front passenger's E-pretensioner unit .

14. Shorted wire check (F-CAN A_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),
    • Gauge control module connector A (32P)
    • TCM 58P connector
    • VSA modulator-control unit 38P connector
    • SH-AWD control unit 24P connector - Refer to: SH-AWD ® Control Unit Removal and Installation (SH-AWD) (2016 2017 2018 2019 2020)
    • SBW shifter control module 20P connector
    • EPS control unit connector A (11P)
    • Steering angle sensor 4P connector
    • Multipurpose camera unit 20P connector
    • SRS unit connector A (39P) - Refer to: SRS Unit Removal and Installation (2014 2015 2016)
    • Driver's E-pretensioner unit 16P connector
    • Front passenger's E-pretensioner unit 16P connector
    • 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
    	Gauge control module 32P connector: disconnected
    	TCM 58P connector: disconnected
    	VSA modulator-control unit 38P connector: disconnected
    	SH-AWD control unit 24P connector: disconnected
    	SBW shifter control module 20P connector: disconnected
    	EPS control unit connector A (11P): disconnected
    	Steering angle sensor 4P connector: disconnected
    	Multipurpose camera unit 20P connector: disconnected
    	SRS unit connector A (39P): disconnected
    	Driver's E-pretensioner unit 16P connector: disconnected
    	Front passenger's E-pretensioner unit 14P connector: disconnected
    	CAN gateway 24P connector: disconnected
    Test point 1	CAN gateway 24P connector 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 A_H wire between the CAN gateway and the connected units.

    NO 

    The F-CAN A_H wire is not shorted to ground. Go to step 15.

15. Shorted wire check (F-CAN A_L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (51P): disconnected
    	Gauge control module 32P connector: disconnected
    	TCM 58P connector: disconnected
    	VSA modulator-control unit 38P connector: disconnected
    	SH-AWD control unit 24P connector: disconnected
    	SBW shifter control module 20P connector: disconnected
    	EPS control unit connector A (11P): disconnected
    	Steering angle sensor 4P connector: disconnected
    	Multipurpose camera unit 20P connector: disconnected
    	SRS unit connector A (39P): disconnected
    	Driver's E-pretensioner unit 16P connector: disconnected
    	Front passenger's E-pretensioner unit 14P connector: disconnected
    	CAN gateway 24P connector: disconnected
    Test point 1	CAN gateway 24P connector No. 15
    Test point 2	Body ground

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

    Is there continuity?

    YES 

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

    NO 

    The F-CAN A_L wire is not shorted to ground. Go to step 16.

16. Shorted wire check (F-CAN A_H line to F-CAN A_L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	PCM connector A (51P): disconnected
    	Gauge control module 32P connector: disconnected
    	TCM 58P connector: disconnected
    	VSA modulator-control unit 38P connector: disconnected
    	SH-AWD control unit 24P connector: disconnected
    	SBW shifter control module 20P connector: disconnected
    	EPS control unit connector A (11P): disconnected
    	Steering angle sensor 4P connector: disconnected
    	Multipurpose camera unit 20P connector: disconnected
    	SRS unit connector A (39P): disconnected
    	Driver's E-pretensioner unit 16P connector: disconnected
    	Front passenger's E-pretensioner unit 14P connector: disconnected
    	CAN gateway 24P connector: disconnected
    Test point 1	CAN gateway 24P connector No. 14
    Test point 2	CAN gateway 24P connector No. 15

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

    Is there continuity?

    YES 

    Repair a short in the F-CAN A_H wire to the F-CAN A_L wire between CAN gateway terminals No. 14 and No. 15.

    NO 

    Update the CAN gateway if it does not have the latest software, or substitute a known-good CAN gateway , then recheck. If DTC U0029-00 goes away and the CAN gateway was updated, troubleshooting is complete. If DTC U0029-00 goes away and the CAN gateway was substituted, replace the original CAN gateway .