OBD Guide
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P0670

Glow Plug Control Module 1 Control Circuit/Open

P0670 is an OBD-II diagnostic trouble code meaning: Glow Plug Control Module 1 Control Circuit/Open. Common causes: open or damaged control circuit between the ecu and the gpcm module, oxidation or damage to the gpcm connector. Estimated repair cost: $17–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–278 (est.)

Symptoms

  • Inability to start a diesel engine in cold weather
  • The Check Engine light comes on
  • Glow plug icon stays on or does not light up
  • Excessive white smoke when trying to start in cold weather
  • Unstable operation of the entire preheating system

Causes

  • Open or damaged control circuit between the ECU and the GPCM module
  • Oxidation or damage to the GPCM connector
  • Glow Plug Control Module (GPCM) Malfunction
  • No power or ground to GPCM
  • Internal ECU fault

How to Fix

  1. Read error codes with an OBD-II scanner, record all active codes
  2. Inspect the GPCM module, wiring and connectors for damage, oxidation, breaks
  3. Check the supply voltage and ground circuit of the GPCM
  4. Check the control circuit between the ECU and GPCM with a multimeter for open and short circuits.
  5. Check the presence of a control signal from the ECU at the GPCM input
  6. If the circuit is working properly, replace the GPCM module; if the ECU is confirmed to be faulty, replace it

Related codes

P0671P0672P0673P0683P0684

Error P0670 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0670 code mean?

P0670 is an OBD-II diagnostic trouble code that indicates: Glow Plug Control Module 1 Control Circuit/Open

What causes a P0670 error code?

The most common causes of P0670 include: Open or damaged control circuit between the ECU and the GPCM module; Oxidation or damage to the GPCM connector; Glow Plug Control Module (GPCM) Malfunction; No power or ground to GPCM.

How do I fix a P0670 diagnostic trouble code?

To fix P0670: Read error codes with an OBD-II scanner, record all active codes. Inspect the GPCM module, wiring and connectors for damage, oxidation, breaks. Check the supply voltage and ground circuit of the GPCM. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0670?

Do not drive — repair immediately

How much does it cost to fix P0670?

The estimated repair cost for P0670 is $17–278. Actual cost depends on your vehicle, location, and labor rates.

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