OBD Guide
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P0382

Glow Plug/Heater Circuit B

P0382 is an OBD-II diagnostic trouble code meaning: Glow Plug/Heater Circuit B. Common causes: faulty (burnt out) glow plug in group b, broken power supply wire for spark plug circuit b. Estimated repair cost: $33–133.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–133 (est.)

Symptoms

  • Difficulty or impossible to start a diesel engine in the cold
  • White smoke from exhaust on cold start
  • Unstable engine operation during warm-up period
  • Check Engine Light Is On
  • The pre-heating lamp lights up abnormally

Causes

  • Faulty (burnt out) glow plug in group B
  • Broken power supply wire for spark plug circuit B
  • Blown glow plug circuit fuse
  • Malfunction of the relay or spark plug control unit
  • Oxidation of contacts in the connectors of circuit B

How to Fix

  1. Read codes, determine which cylinders are in group B
  2. Check the glow plug circuit fuse (usually a powerful one: 50–80A)
  3. Measure the resistance of each glow plug in group B (standard: 0.5-2 ohms)
  4. Check the supply voltage at the connector of each spark plug when cranking with the starter.
  5. Inspect the wiring for breaks or burns
  6. Replace faulty glow plugs

Related codes

P0380P0381P0383P0384P0385P037B

Error P0382 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0382 code mean?

P0382 is an OBD-II diagnostic trouble code that indicates: Glow Plug/Heater Circuit B

What causes a P0382 error code?

The most common causes of P0382 include: Faulty (burnt out) glow plug in group B; Broken power supply wire for spark plug circuit B; Blown glow plug circuit fuse; Malfunction of the relay or spark plug control unit.

How do I fix a P0382 diagnostic trouble code?

To fix P0382: Read codes, determine which cylinders are in group B. Check the glow plug circuit fuse (usually a powerful one: 50–80A). Measure the resistance of each glow plug in group B (standard: 0.5-2 ohms). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0382?

Limited driving only, diagnose soon

How much does it cost to fix P0382?

The estimated repair cost for P0382 is $33–133. Actual cost depends on your vehicle, location, and labor rates.

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