OBD Guide
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C0503

Left Front Wheel Speed Sensor A Circuit High

C0503 is an OBD-II diagnostic trouble code meaning: Left Front Wheel Speed Sensor A Circuit High. Common causes: left front wheel speed sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • ABS/ESP indicator is on
  • Disabling the ABS system
  • Incorrect operation of cruise control
  • Errors in the operation of the stabilization system

Causes

  • Left front wheel speed sensor malfunction
  • Open or short circuit in wiring harness
  • Damage to the sensor connector
  • Problems with the ABS/ESP control unit
  • Contamination or damage to the gear ring on the hub

How to Fix

  1. Check the condition of the wheel speed sensor and its connector
  2. Inspect the wiring harness for damage
  3. Check sensor resistance (must meet specification)
  4. Check the toothed ring on the hub for damage or contamination
  5. If necessary, replace the sensor or repair the wiring harness
  6. Clear error codes and check if C0503 returns

Related codes

C0500C0501C0502C0504

Error C0503 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the C0503 code mean?

C0503 is an OBD-II diagnostic trouble code that indicates: Left Front Wheel Speed Sensor A Circuit High

What causes a C0503 error code?

The most common causes of C0503 include: Left front wheel speed sensor malfunction; Open or short circuit in wiring harness; Damage to the sensor connector; Problems with the ABS/ESP control unit.

How do I fix a C0503 diagnostic trouble code?

To fix C0503: Check the condition of the wheel speed sensor and its connector. Inspect the wiring harness for damage. Check sensor resistance (must meet specification). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C0503?

Limited driving only, diagnose soon

How much does it cost to fix C0503?

The estimated repair cost for C0503 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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