SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSHONDA2020CIVIC SPORT, 4D HATCHBACK, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESVSA SYSTEM - ADVANCED DIAGNOSTICSDTC ADVANCED DIAGNOSTICSVSA RELATED DTCS (VSA CONTROL UNIT)DTC C0023-14: BRAKE DIAG CIRCUIT OFF FAILURE
2020 Honda Civic Sport, 4D Hatchback, Standard Trans

DTC C0023-14: Brake Diag Circuit OFF Failure

2020 Honda Civic Sport, 4D Hatchback, Standard TransSECTION DTC C0023-14: Brake Diag Circuit OFF Failure
Confirmation Procedure Basic Condition:
  • 12 volt battery voltage 10 V or more

Operating Condition:

  • Turn the vehicle to the ON mode and press the brake pedal for at least 2 seconds.
Execution Regular Diagnosis
Duration About 2 seconds

*1: 2/4-door (except Japan production)

*2: 4-door (Japan production)

*3: 5-door

DTC Type
  • 1 drive cycle
  • Brake system indicator (amber) on
Fail Safe Action
  • Stop automatic brake hold function
  • Stop driving support system's brake function
  • Stop emergency brake function
Possible Cause* 1
  • Open or Poor connection between the VSA modulator-control unit and the relay circuit board (built-in brake light relay) (BRK DIAG, BRK LAMP lines)
  • Open or Poor connection between the under-hood fuse/relay box and the relay circuit board (built-in brake light relay) (+B STOP line)
  • Open or Poor connection between the relay circuit board (built-in brake light relay) and the under-dash fuse/relay box (IG1 VSA/ABS line)
  • Blown fuse (No. A9 )
  • Brake light relay failure
  • VSA modulator-control unit internal failure
Possible Cause* 2* 3
  • Open or Poor connection between the VSA modulator-control unit and the relay circuit board (built-in brake light relay) (BRK DIAG, BRK LAMP lines)
  • Open or Poor connection between the under-hood fuse/relay box and the relay circuit board (built-in brake light relay) (+B STOP line)
  • Open or Poor connection between the relay circuit board (built-in brake light relay) and the under-dash fuse/relay box (IG1 OPTION line)
  • Blown fuse (No. A8 )
  • Brake light relay failure
  • VSA modulator-control unit internal failure

*1: 2/4-door (except Japan production)

*2: 4-door (Japan production)

*3: 5-door

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.