OBD Guide
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B0508

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

B0508 is an OBD-II diagnostic trouble code meaning: Short To Voltage Or BCM Open Internally In The LH DRL Relay Control Circuit. Common causes: short circuit to voltage in the drl relay control circuit, internal break in bku. Estimated repair cost: $56–167.

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

Symptoms

  • Left DRLs don't work
  • Left DRL flashing
  • The malfunction indicator on the dashboard lights up

Causes

  • Short circuit to voltage in the DRL relay control circuit
  • Internal break in BKU
  • Wiring harness damage
  • DRL relay malfunction
  • Contact corrosion

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the condition of the DRL relay
  3. Check the operation of the BKU
  4. Replace damaged components
  5. Clean contacts from corrosion

Related codes

B0507B0509B0510

Error B0508 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the B0508 code mean?

B0508 is an OBD-II diagnostic trouble code that indicates: Short To Voltage Or BCM Open Internally In The LH DRL Relay Control Circuit

What causes a B0508 error code?

The most common causes of B0508 include: Short circuit to voltage in the DRL relay control circuit; Internal break in BKU; Wiring harness damage; DRL relay malfunction.

How do I fix a B0508 diagnostic trouble code?

To fix B0508: Check the integrity of the wiring harness. Check the condition of the DRL relay. Check the operation of the BKU. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B0508?

Limited driving only, diagnose soon

How much does it cost to fix B0508?

The estimated repair cost for B0508 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat