DTC Advanced Diagnostics: U0047-00
DTC U0047-00: CAN Communication Failure (Bus OFF Ch 2)
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:
1.
Start the engine.
Execution
Initial Diagnosis/Regular Diagnosis
Duration
About 2 seconds
DTC Type
1 drive cycle
Brake system indicator (red) blink (Dependant upon the conditions)
Brake system indicator (amber) on (Dependant upon the conditions)
ABS indicator on (Dependant upon the conditions)*1
VSA indicator on (Dependant upon the conditions)
Fail Safe Action
Stop CAN function (Dependant upon the conditions)
Degrade ABS performance (Dependant upon the conditions)*2
Stop ABS function (Dependant upon the conditions)*1
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 brake assist function (Dependant upon the conditions)*1
Stop hydraulic boost failure compensation function (Dependant upon the conditions)*1
Stop hill start assist function (Dependant upon the conditions)
Stop automatic brake hold function (Dependant upon the conditions)
Stop automatic operating function (Drive away assist) (Dependant upon the conditions)
Stop ignition OFF apply function (Dependant upon the conditions)
Stop ACC function (Dependant upon the conditions)*3
Stop CMBS function (Dependant upon the conditions)*3
Possible Cause
Open, Short to ground, Short to power, or Short to another line between the VSA modulator-control unit and other control units (EBB CAN lines)*4
Open, Short to ground, Short to power, or Short to another line between the VSA modulator-control unit and other control units (F-CAN B lines)*5
Internal failure of other unit on EBB CAN*4
Internal failure of other unit on F-CAN*5
VSA modulator-control unit internal failure
*1: AWD
*2: 2WD
*3: With ACC
*4: Without CAN gateway
*5: With CAN gateway