DTC U0029-00 (CAN Gateway) (2014 2015)

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

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information .

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

DTC (CAN gateway)

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.

Intermittent failure, the system is OK at this time.

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.

Update the PCM if it does not have the latest software, or substitute a known-good PCM , 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 .

Shorted unit check (engine mount control unit)

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

-2. Disconnect the following connector.

Engine mount control unit 16P 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 (with ACC)

Go to step 4.

YES (without ACC)

Go to step 5.

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

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

Is DTC U0029-00 indicated?

YES

Go to step 5.

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

Shorted unit check (gauge control module)

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

-2. Disconnect the following connector.

Gauge control module connector A (32P)

-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.

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 .

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

Is DTC U0029-00 indicated?

YES

Go to step 7.

Update the SRS unit if it does not have the latest software, or substitute a known-good SRS unit , 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 .

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
	Engine mount control unit 16P connector: disconnected
	E-pretensioner unit connector A (16P) (with ACC): disconnected
	E-pretensioner unit connector B (14P) (with ACC): disconnected
	Gauge control module connector A (32P): disconnected
	SRS unit connector A (39P): disconnected
	CAN gateway 24P connector: disconnected
Test circuit	F-CAN A_H
Test point 1	CAN gateway 24P connector No. 14 (BLU)
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.

The F-CAN A_H wire is not short to ground. Go to step 8.

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
	Engine mount control unit 16P connector: disconnected
	E-pretensioner unit connector A (16P) (with ACC): disconnected
	E-pretensioner unit connector B (14P) (with ACC): disconnected
	Gauge control module connector A (32P): disconnected
	SRS unit connector A (39P): disconnected
	CAN gateway 24P connector: disconnected
Test circuit	F-CAN A_L
Test point 1	CAN gateway 24P connector No. 15 (PNK)
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.

The F-CAN A_L wire is not short to ground. Go to step 9.

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
	Engine mount control unit 16P connector: disconnected
	E-pretensioner unit connector A (16P) (with ACC): disconnected
	E-pretensioner unit connector B (14P) (with ACC): disconnected
	Gauge control module connector A (32P): disconnected
	SRS unit connector A (39P): disconnected
	CAN gateway 24P connector: disconnected
Test circuit	F-CAN A_H, F-CAN A_L
Test point 1	CAN gateway 24P connector No. 14 (BLU)
Test point 2	CAN gateway 24P connector No. 15 (PNK)

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.

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 .