OBD Guide
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P0683

Glow Plug Control Module 1 to PCM Communication Circuit

P0683 is an OBD-II diagnostic trouble code meaning: Glow Plug Control Module 1 to PCM Communication Circuit. Common causes: damage to the wiring of the communication circuit between the gpcm and the ecu, oxidation or breakage of module connectors. Estimated repair cost: $22–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–278 (est.)

Symptoms

  • Complete failure of the glow plug system
  • Inability to start a diesel engine in cold weather
  • Check Engine Light
  • The glow plug indicator is constantly on
  • Loss of communication with GPCM in the diagnostic scanner

Causes

  • Damage to the wiring of the communication circuit between the GPCM and the ECU
  • Oxidation or breakage of module connectors
  • GPCM module malfunction
  • GPCM power or ground fault
  • Internal ECU fault

How to Fix

  1. Read OBD-II codes and check for lost communication codes
  2. Check power and ground of GPCM module
  3. Inspect the wiring of the communication circuit between the GPCM and the ECU
  4. Measure resistance and voltage in the communication circuit
  5. Check the connectors of both modules for oxidation and damage.
  6. Replace GPCM or ECU if internal fault is confirmed

Related codes

P0684P0670P0671P0672

Error P0683 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0683 code mean?

P0683 is an OBD-II diagnostic trouble code that indicates: Glow Plug Control Module 1 to PCM Communication Circuit

What causes a P0683 error code?

The most common causes of P0683 include: Damage to the wiring of the communication circuit between the GPCM and the ECU; Oxidation or breakage of module connectors; GPCM module malfunction; GPCM power or ground fault.

How do I fix a P0683 diagnostic trouble code?

To fix P0683: Read OBD-II codes and check for lost communication codes. Check power and ground of GPCM module. Inspect the wiring of the communication circuit between the GPCM and the ECU. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0683?

Do not drive — repair immediately

How much does it cost to fix P0683?

The estimated repair cost for P0683 is $22–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat