OBD Guide
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C05AB

Brake Blending Separation Valve Performance

C05AB is an OBD-II diagnostic trouble code meaning: Brake Blending Separation Valve Performance. Common causes: malfunction of the brake circuit separation valve, wiring harness damage. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • The brake system fault indicator is on
  • Uneven braking
  • Deterioration in controllability when braking
  • Brake pedal dips

Causes

  • Malfunction of the brake circuit separation valve
  • Wiring harness damage
  • Contact corrosion
  • Problems with the brake ECU

How to Fix

  1. Check the integrity of the wiring harness
  2. Check valve contacts
  3. Test the brake circuit separation valve
  4. Replace faulty valve
  5. Diagnose the brake system ECU

Related codes

C05AAC05ACC05AD

Error C05AB by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the C05AB code mean?

C05AB is an OBD-II diagnostic trouble code that indicates: Brake Blending Separation Valve Performance

What causes a C05AB error code?

The most common causes of C05AB include: Malfunction of the brake circuit separation valve; Wiring harness damage; Contact corrosion; Problems with the brake ECU.

How do I fix a C05AB diagnostic trouble code?

To fix C05AB: Check the integrity of the wiring harness. Check valve contacts. Test the brake circuit separation valve. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C05AB?

Limited driving only, diagnose soon

How much does it cost to fix C05AB?

The estimated repair cost for C05AB is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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