DTC U0029-00 (VSA Control Unit)

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

NOTE

Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the ABS/VSA indicator comes on, and continues until the indicator goes off.
Regular Diagnosis:
The regular on-board diagnosis begins right after the ABS/VSA indicator goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
Review "How to troubleshoot the VSA system" before doing the DTC troubleshooting procedure.
Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified.
The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Confirmation Procedure	Basic Condition: 12 volt battery voltage 9.6 - 16.5 V With the Driving Pattern: Turn the vehicle to the READY TO DRIVE mode.
Execution	Initial Diagnosis/Regular Diagnosis
Duration	About 2 seconds
DTC Type	1 drive cycle Brake system indicator (red) blink Brake system indicator (amber) on VSA indicator on
Fail Safe Action	Stop CAN function (Dependant upon the conditions) Degrade ABS performance Stop engine drag torque control function Stop TCS function Stop VSA function Stop agile handling assist function Degrade hydraulic boost failure compensation function Stop electric parking brake function (some of function)
Possible Cause	Open, short to ground, short to power, or short to another line between the VSA modulator-control unit and other control units (F-CAN lines) Internal failure of other unit on F-CAN VSA modulator-control unit internal failure