OBD Guide
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P066F

Cylinder 3 Glow Plug Control Circuit High

P066F is an OBD-II diagnostic trouble code meaning: Cylinder 3 Glow Plug Control Circuit High. Common causes: short circuit of the glow plug control wire of cylinder 3 to power, open ground circuit in control circuit. Estimated repair cost: $17–278.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–278 (est.)

Symptoms

  • Difficulty starting a diesel engine in cold weather
  • The Check Engine light comes on
  • Extended warm-up time before starting
  • White smoke from exhaust pipe on cold start
  • Unstable engine operation at idle

Causes

  • Short circuit of the glow plug control wire of cylinder 3 to power
  • Open ground circuit in control circuit
  • Glow Plug Control Module (GPCM) Malfunction
  • Damage to control circuit wiring or connectors
  • Internal ECU fault

How to Fix

  1. Read error codes with an OBD-II scanner, capture a freeze frame of the data
  2. Inspect the wiring and connectors of the cylinder 3 glow plug and GPCM
  3. Measure the voltage in the spark plug control circuit of cylinder 3
  4. Check the ground circuit for open circuit with a multimeter
  5. Check signal wire for short circuit to power
  6. If the wiring is working properly, diagnose and replace the GPCM or ECU

Related codes

P066EP0673P066CP066DP0670

Error P066F by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P066F code mean?

P066F is an OBD-II diagnostic trouble code that indicates: Cylinder 3 Glow Plug Control Circuit High

What causes a P066F error code?

The most common causes of P066F include: Short circuit of the glow plug control wire of cylinder 3 to power; Open ground circuit in control circuit; Glow Plug Control Module (GPCM) Malfunction; Damage to control circuit wiring or connectors.

How do I fix a P066F diagnostic trouble code?

To fix P066F: Read error codes with an OBD-II scanner, capture a freeze frame of the data. Inspect the wiring and connectors of the cylinder 3 glow plug and GPCM. Measure the voltage in the spark plug control circuit of cylinder 3. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P066F?

Yes, but get it checked soon

How much does it cost to fix P066F?

The estimated repair cost for P066F is $17–278. Actual cost depends on your vehicle, location, and labor rates.

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