DTC U0029-00, U0047-00 (VSA Control Unit (With CAN Gateway)) (2017 2018)

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 - Refer to:
How to Troubleshoot the VSA System (2017 2018 2019 2020)
Troubleshoot any PGM-FI DTCs first.

DTC Description	DTC	Freeze Frame
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 start the engine.

- 4. Check for DTCs with the HDS.

DTC Description	DTC	Freeze Frame
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 - Refer to:

How to Troubleshoot the VSA System (2017 2018 2019 2020)

If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

DTC check (CAN gateway system)

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

DTC Description	DTC

Is DTC 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 A) is Not Available

Go to step 4.

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

Go to step 5.

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

Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If they are OK, replace the VSA modulator-control unit .

Open wire check (F-CAN A_H, F-CAN A_L lines)

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

- 2. Disconnect the following connectors.

VSA modulator-control unit 38P connector

CAN gateway 24P connector

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

Test condition	Vehicle OFF (LOCK) mode
	VSA modulator-control unit 38P connector: disconnected
	CAN gateway 24P connector: disconnected
Test circuit 1
Test point 1	VSA modulator-control unit 38P connector No. 38 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)
Test point 2	CAN gateway 24P connector (female terminals) No. 14:

Test circuit 2
Test point 1	VSA modulator-control unit 38P connector No. 26 - Refer to: VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)
Test point 2	CAN gateway 24P connector (female terminals) No. 15:

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

Is there continuity?

YES

The F-CAN A_H and F-CAN A_L wires are OK. Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. 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 B_H, F-CAN B_L lines)