OBD Guide
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P06B9

Cylinder 1 Glow Plug Circuit Range/Performance

P06B9 is an OBD-II diagnostic trouble code meaning: Cylinder 1 Glow Plug Circuit Range/Performance. Common causes: worn or partially damaged heating element of cylinder 1 glow plug, poor contact or oxidation in the glow plug connector. Estimated repair cost: $6–22.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–22 (est.)

Symptoms

  • Slightly difficult engine starting in cold weather
  • Check Engine Light Is On
  • Slight white smoke on cold start
  • Unstable operation when warming up in frosty weather
  • Increased starter cranking time at low temperatures

Causes

  • Worn or partially damaged heating element of cylinder 1 glow plug
  • Poor contact or oxidation in the glow plug connector
  • Damage to wire insulation (partial short circuit)
  • Incipient relay or glow plug control module failure
  • Corrosion of the glow plug terminal itself

How to Fix

  1. Read error codes, record frozen frame data
  2. Check the resistance of the glow plug of cylinder 1 (normal 0.5–2 Ohm)
  3. Inspect the spark plug connector and terminal for oxidation, clean if necessary
  4. Check the current through the spark plug during the warm-up cycle using a current clamp meter.
  5. Replace the glow plug if abnormal performance is confirmed
  6. Reset codes, check for errors after replacement

Related codes

P06BAP06BBP06BCP0671P0672

Error P06B9 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P06B9 code mean?

P06B9 is an OBD-II diagnostic trouble code that indicates: Cylinder 1 Glow Plug Circuit Range/Performance

What causes a P06B9 error code?

The most common causes of P06B9 include: Worn or partially damaged heating element of cylinder 1 glow plug; Poor contact or oxidation in the glow plug connector; Damage to wire insulation (partial short circuit); Incipient relay or glow plug control module failure.

How do I fix a P06B9 diagnostic trouble code?

To fix P06B9: Read error codes, record frozen frame data. Check the resistance of the glow plug of cylinder 1 (normal 0.5–2 Ohm). Inspect the spark plug connector and terminal for oxidation, clean if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P06B9?

Yes, but get it checked soon

How much does it cost to fix P06B9?

The estimated repair cost for P06B9 is $6–22. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat