OBD Guide
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B0503

Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit

B0503 is an OBD-II diagnostic trouble code meaning: Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit. Common causes: short circuit in the drl relay control circuit, internal open in body control module (bcm). Estimated repair cost: $56–167.

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

Symptoms

  • Right DRL does not work
  • Right DRL flashing
  • Dashboard warning

Causes

  • Short circuit in the DRL relay control circuit
  • Internal open in body control module (BCM)
  • Wiring harness damage
  • DRL relay malfunction

How to Fix

  1. Check the integrity of the wiring harness in the DRL control circuit
  2. Check the DRL relay for malfunction
  3. Check the body control module (BCM) for internal breaks.
  4. Replace damaged components

Related codes

B0501B0502B0504

Error B0503 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the B0503 code mean?

B0503 is an OBD-II diagnostic trouble code that indicates: Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit

What causes a B0503 error code?

The most common causes of B0503 include: Short circuit in the DRL relay control circuit; Internal open in body control module (BCM); Wiring harness damage; DRL relay malfunction.

How do I fix a B0503 diagnostic trouble code?

To fix B0503: Check the integrity of the wiring harness in the DRL control circuit. Check the DRL relay for malfunction. Check the body control module (BCM) for internal breaks.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B0503?

Limited driving only, diagnose soon

How much does it cost to fix B0503?

The estimated repair cost for B0503 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat