DTC U0029-00 (VSA Control Unit (Without CAN Gateway)) (2017 2018 2019)

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

NOTE:

Before you troubleshoot, review the general troubleshooting information .
This DTC is stored by communication failure between the F-CAN line and the VSA modulator-control unit. When DTC U0029-00 is indicated, the F-CAN line has already returned to normal. Check for loose terminals and poor connections in the connectors. If the connectors are OK, clear the DTC and following this troubleshooting.

DTC Description	DTC	Freeze Frame
U0029-00 CAN Communication Failure (Bus OFF Ch 1)

DTC (VSA)

VSA modulator-control unit communication check
-1. Start the engine.

-2. Check for communication between the VSA modulator-control unit and the HDS.

Is there communication between the VSA modulator-control unit and the HDS?

YES

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

NO

Go to step 2.

Open wire check (F-CAN H, F-CAN L lines)

-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 connectors.

VSA modulator-control unit 46P connector

PCM connector A (51P)

-4. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	VSA modulator-control unit 46P connector: disconnected
	PCM connector A (51P): disconnected
Test circuit 1
Test point 1	VSA modulator-control unit 46P connector No. 40
Test point 2	PCM connector A (51P) No. 2

Test circuit 2
Test point 1	VSA modulator-control unit 46P connector No. 28
Test point 2	PCM connector A (51P) No. 1

Is there continuity?

YES

The F-CAN H and F-CAN 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 PCM.