OBD Guide
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P066E

Cylinder 3 Glow Plug Control Circuit Low

P066E is an OBD-II diagnostic trouble code meaning: Cylinder 3 Glow Plug Control Circuit Low. Common causes: short circuit of the glow plug control wire of cylinder 3 to ground, broken or damaged control circuit wiring. 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
  • Increased starter cranking time
  • White smoke from the exhaust pipe when starting
  • Unstable engine operation after a cold start

Causes

  • Short circuit of the glow plug control wire of cylinder 3 to ground
  • Broken or damaged control circuit wiring
  • Glow Plug Control Module (GPCM) Malfunction
  • Faulty glow plug cylinder 3
  • Oxidation or damage to connectors

How to Fix

  1. Read error codes with an OBD-II scanner, capture freeze frame data
  2. Inspect the wiring and connectors of the cylinder 3 glow plug and GPCM
  3. Measure the voltage in the glow plug control circuit of cylinder 3
  4. Check the resistance of the glow plug (normal: 0.5–2 Ohm)
  5. Check wires for short circuit to ground and open circuit
  6. If the wiring is in good condition - diagnostics and replacement of the GPCM or spark plug

Related codes

P066FP0673P066AP066CP0670

Error P066E by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P066E code mean?

P066E is an OBD-II diagnostic trouble code that indicates: Cylinder 3 Glow Plug Control Circuit Low

What causes a P066E error code?

The most common causes of P066E include: Short circuit of the glow plug control wire of cylinder 3 to ground; Broken or damaged control circuit wiring; Glow Plug Control Module (GPCM) Malfunction; Faulty glow plug cylinder 3.

How do I fix a P066E diagnostic trouble code?

To fix P066E: Read error codes with an OBD-II scanner, capture freeze frame data. Inspect the wiring and connectors of the cylinder 3 glow plug and GPCM. Measure the voltage in the glow plug control circuit of cylinder 3. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P066E?

Yes, but get it checked soon

How much does it cost to fix P066E?

The estimated repair cost for P066E is $17–278. Actual cost depends on your vehicle, location, and labor rates.

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