DTC U0029-00 (CAN Gateway) (2019 2020)

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

   Is DTC U0029-00 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 (2016 2017 2018 2019 2020) . 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. Reconnect PCM connector A (51P).

   - 3. Disconnect the following connector.

   Gauge control module connector A (32P)

   - 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 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 connector A (32P).

   - 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 

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

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good VSA modulator-control unit . 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 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting 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) . 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 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good EPS control unit . 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 (electric parking brake control unit)

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

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

    - 3. Disconnect the following connector.

    Electric parking brake control unit 30P 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 

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

11. 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 12.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good multipurpose camera unit . If DTC U0029-00 goes away and the multipurpose camera unit was substituted, replace the original multipurpose camera unit .

12. 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 13.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good SRS unit - Refer to: SRS Unit Removal and Installation (2017 2018 2019 2020), . If DTC U0029-00 goes away and the SRS unit was substituted, replace the original SRS unit - Refer to: SRS Unit Removal and Installation (2017 2018 2019 2020) .

13. 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)
    • Gauge control module connector A (32P)
    • TCM 58P connector
    • VSA modulator-control unit 38P connector
    • SH-AWD control unit 24P connector
    • SBW shifter control module 20P connector
    • EPS control unit connector A (11P)
    • Steering angle sensor 4P connector
    • Multipurpose camera unit 20P connector
    • Electric parking brake control unit 30P connector
    • SRS unit connector A (39P)
    • 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
    	Gauge control module connector A (32P): 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
    	Electric parking brake control unit 30P connector: disconnected
    	Multipurpose camera unit 20P connector: disconnected
    	SRS unit connector A (39P): disconnected
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 3:
    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 14.

14. 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 connector A (32P): 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
    	Electric parking brake control unit 30P connector: disconnected
    	Multipurpose camera unit 20P connector: disconnected
    	SRS unit connector A (39P): disconnected
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) 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 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 15.

15. 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 connector A (32P): 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
    	Electric parking brake control unit 30P connector: disconnected
    	Multipurpose camera unit 20P connector: disconnected
    	SRS unit connector A (39P): disconnected
    	CAN gateway 16P connector: disconnected
    Test point 1	CAN gateway 16P connector (female terminals) No. 3:
    Test point 2	CAN gateway 16P connector (female terminals) No. 11:

    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. 3 and No. 11.

    NO 

    Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the CAN gateway .