OBD Guide
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P03FD

Ignition L Control Signal Circuit/Open

P03FD is an OBD-II diagnostic trouble code meaning: Ignition L Control Signal Circuit/Open. Common causes: open or short circuit in the ignition coil wiring harness, faulty ignition coil. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Misfire in one or more cylinders
  • Unstable engine idling
  • Reduced power and deterioration in dynamics
  • Increased fuel consumption
  • Check Engine Light Illuminates

Causes

  • Open or short circuit in the ignition coil wiring harness
  • Faulty ignition coil
  • Problem with the output circuit in the ECU
  • Poor contact in the ignition coil or ECU connector
  • Contact corrosion
  • Mechanical damage to wiring

How to Fix

  1. Visual inspection of wiring and connectors for damage
  2. Checking the ignition coil resistance
  3. Checking the integrity of the control circuit from the computer to the coil
  4. Checking the presence of a control signal from the computer with an oscilloscope
  5. Replacing a faulty ignition coil if necessary
  6. Repair or replace damaged wiring harness
  7. Cleaning contacts in connectors
  8. Software diagnostics of the computer if it is suspected of malfunction

Related codes

P0300P0301P0302P0303P0304P0351P0352

Error P03FD by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P03FD code mean?

P03FD is an OBD-II diagnostic trouble code that indicates: Ignition L Control Signal Circuit/Open

What causes a P03FD error code?

The most common causes of P03FD include: Open or short circuit in the ignition coil wiring harness; Faulty ignition coil; Problem with the output circuit in the ECU; Poor contact in the ignition coil or ECU connector.

How do I fix a P03FD diagnostic trouble code?

To fix P03FD: Visual inspection of wiring and connectors for damage. Checking the ignition coil resistance. Checking the integrity of the control circuit from the computer to the coil. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P03FD?

Limited driving only, diagnose soon

How much does it cost to fix P03FD?

The estimated repair cost for P03FD is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat