DTC U0155-00 (VSA Control Unit)

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DTC U0155-00 : CAN Communication Failure with Meter

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	Regular Diagnosis
Duration	About 5 seconds
DTC Type	1 drive cycle Brake system indicator (amber) on (Dependant upon the conditions) VSA indicator on (Dependant upon the conditions)
Fail Safe Action	Degrade ABS performance (Dependant upon the conditions) Stop engine drag torque control function (Dependant upon the conditions) Stop TCS function (Dependant upon the conditions) Stop VSA function (Dependant upon the conditions) Stop agile handling assist function (Dependant upon the conditions) Stop hydraulic boost failure compensation function (Dependant upon the conditions) Stop electric parking brake function (some of function) (Dependant upon the conditions)
Possible Cause	Open or poor connection between the VSA modulator-control unit and the gauge control module (F-CAN lines) Gauge control module internal failure VSA modulator-control unit internal failure