DTC U0029-00: CAN Gateway F-CAN ch A Bus Off (V6, With SH-AWD and CAN gateway) (2015-17)

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

3. Shorted unit check (gauge control module)

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

   - 2. Disconnect the following connector.

   Gauge control module 32P 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
   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. 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
   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. 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
   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 - Refer to: VSA Modulator-Control Unit Update (With SH-AWD), or VSA Modulator-Control Unit Update 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 - Refer to: VSA Modulator-Control Unit Removal and Installation (With SH-AWD), or VSA Modulator-Control Unit Removal and Installation .

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

   Is DTC U0029-00 indicated?

   YES 

   Go to step 7.

   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 .

7. Shorted unit check (EPS control unit)

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

   - 2. Disconnect the following connector.

   EPS control unit connector A (11P)

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

   Is DTC U0029-00 indicated?

   YES 

   Go to step 8.

   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 .

8. 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 9.

   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 .

9. Shorted unit check (electric parking brake control unit)

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

   - 2. Disconnect the following connector.

   Electric parking brake control unit 30P 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
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 10.

   NO 

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

10. 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
    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. Do the 12 volt battery terminal disconnection procedure, and wait for at least 3 minutes.

    - 3. Disconnect the following connector.

    SRS unit connector A (39P)

    - 4. Do the 12 volt 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
    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, or SRS Unit Removal and Installation (2018-19) , 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, or SRS Unit Removal and Installation (2018-19) .

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

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

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

    - 3. Disconnect the following connector.

    Driver's E-pretensioner unit 16P connector

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

    - 3. Disconnect the following connector.

    Front passenger's E-pretensioner unit 14P connector

    - 4. Do the 12 volt 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
    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 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
    	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
    	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
    	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
    	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
    	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
    	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 .