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HOMESERVICE MANUALSHONDA2020CIVIC SI, 4D SEDANREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESVSA SYSTEM - ADVANCED DIAGNOSTICSDTC ADVANCED DIAGNOSTICSVSA RELATED DTCS (VSA CONTROL UNIT)DTC U0104-00: CAN COMMUNICATION FAILURE WITH ACC
2020 Honda Civic Si, 4D Sedan

DTC U0104-00: CAN Communication Failure with ACC

2020 Honda Civic Si, 4D SedanSECTION DTC U0104-00: CAN Communication Failure with ACC
Confirmation Procedure Basic Condition:
  • 12 volt battery voltage 10 V or more

Operating Condition:

  • Start the engine.
  • Test drive the vehicle at 7 mph (10 km/h) or more for at least 2 seconds.

    (Drive the vehicle on the road, not on a lift. Be careful of surrounding traffic conditions.)
Execution Regular Diagnosis
Duration About 2 seconds
DTC Type
  • 1 drive cycle
  • VSA indicator on
Fail Safe Action
  • Stop driving support system's brake function
Possible Cause
  • Open or Poor connection between the VSA modulator-control unit and the CAN gateway (F-CAN A_L, F-CAN A_H, F-CAN B_L, F-CAN B_H lines)
  • Open or Poor connection between the CAN gateway and the multipurpose camera unit (F-CAN B_L, F-CAN B_H)* 1
  • Open or Poor connection between the CAN gateway and the millimeter wave radar (F-CAN B_L, F-CAN B_H)* 2 /* 3
  • Multipurpose camera unit failure* 1
  • Millimeter wave radar failure* 2 /* 3
  • VSA modulator-control unit internal failure

*1: '16-18 2/4-door

*2: 5-door

*3: '19-21 2/4-door

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.