DTC U0029-00, U0047-00 (VSA Control Unit)

WARNING: This page is about a different variant/trim than selected.

DTC U0029-00 : CAN Communication Failure (Bus OFF Ch 1)

DTC U0047-00 : CAN Communication Failure (Bus OFF Ch 2)

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

DTC Description	DTC
U0029-00 CAN Communication Failure (Bus OFF Ch 1)
U0047-00 CAN Communication Failure (Bus OFF Ch 2)

DTC (VSA)

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, then to the READY TO DRIVE mode.

-4. Check for DTCs with the HDS.

DTC Description	DTC
U0029-00 CAN Communication Failure (Bus OFF Ch 1)
U0047-00 CAN Communication Failure (Bus OFF Ch 2)

Is DTC U0029-00 or U0047-00 indicated?

YES

The failure is duplicated. Go to step 2.

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .

DTC check (CAN gateway system)

-1. Check for CAN gateway system DTCs with the HDS.

DTC Description	DTC

Are DTC(s) indicated?

YES

Go to indicated DTC's troubleshooting.

Go to step 3.

F-CAN circuit communication check
-1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

F-CAN Bus Connected Unit Check

Which result is indicated?

VSA modulator-control unit (Bus B) is Not Available

Go to step 4.

VSA modulator-control unit (Bus C) is Not Available

Go to step 5.

VSA modulator-control unit (Bus B and C) is Available

Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

Open wire check (F-CAN B_H, F-CAN B_L lines)

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

-2. Disconnect the following connectors.

VSA modulator-control unit 46P connector

CAN gateway 16P connector

-3. Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	VSA modulator-control unit 46P connector: disconnected
	CAN gateway 16P connector: disconnected
Test circuit 1
Test point 1	VSA modulator-control unit 46P connector No. 40
Test point 2	CAN gateway 16P connector (female terminals) No. 6:

Test circuit 2
Test point 1	VSA modulator-control unit 46P connector No. 28
Test point 2	CAN gateway 16P connector (female terminals) No. 14:

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

Is there 1.0 Ω or less?

YES

The F-CAN B_H and F-CAN B_L wires are OK. Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

Repair an open in the wire between the VSA modulator-control unit and the CAN gateway.

Open wire check (F-CAN C_H, F-CAN C_L lines)