OBD Guide
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P0671

Cylinder 1 Glow Plug Circuit/Open

P0671 is an OBD-II diagnostic trouble code meaning: Cylinder 1 Glow Plug Circuit/Open. Common causes: burnt out or worn glow plug for cylinder 1, broken glow plug lead wire. Estimated repair cost: $17–44.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–44 (est.)

Symptoms

  • Difficulty starting a diesel engine at low temperatures
  • The Check Engine light comes on
  • White smoke from the exhaust pipe during cold start
  • Unstable engine operation after a cold start
  • The glow plug icon is lit on the dashboard

Causes

  • Burnt out or worn glow plug for cylinder 1
  • Broken glow plug lead wire
  • Oxidation or poor contact in the spark plug connector
  • Relay or GPCM faulty
  • Damage to the wiring from the GPCM to the glow plug

How to Fix

  1. Read error codes with OBD-II scanner
  2. Measure the resistance of the glow plug of cylinder 1 with a multimeter (norm: 0.5–2 Ohm; break - infinity)
  3. Visually inspect the wiring and glow plug connector for cylinder 1
  4. Check the voltage at the spark plug contact when the ignition is turned on.
  5. Replace the glow plug of cylinder 1 if its malfunction is confirmed.
  6. Check and if necessary replace the GPCM

Related codes

P0672P0673P0674P066AP066BP0670

Error P0671 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0671 code mean?

P0671 is an OBD-II diagnostic trouble code that indicates: Cylinder 1 Glow Plug Circuit/Open

What causes a P0671 error code?

The most common causes of P0671 include: Burnt out or worn glow plug for cylinder 1; Broken glow plug lead wire; Oxidation or poor contact in the spark plug connector; Relay or GPCM faulty.

How do I fix a P0671 diagnostic trouble code?

To fix P0671: Read error codes with OBD-II scanner. Measure the resistance of the glow plug of cylinder 1 with a multimeter (norm: 0.5–2 Ohm; break - infinity). Visually inspect the wiring and glow plug connector for cylinder 1. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0671?

Yes, but get it checked soon

How much does it cost to fix P0671?

The estimated repair cost for P0671 is $17–44. Actual cost depends on your vehicle, location, and labor rates.

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