OBD Guide
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P04C1

Fuel Fill Door Unlock Control Circuit Low

P04C1 is an OBD-II diagnostic trouble code meaning: Fuel Fill Door Unlock Control Circuit Low. Common causes: open or short circuit in wiring harness, malfunction of the fuel tank flap lock solenoid. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • The fuel filler flap does not open
  • Check Engine Light on Dashboard
  • Problems with refueling

Causes

  • Open or short circuit in wiring harness
  • Malfunction of the fuel tank flap lock solenoid
  • Problems with the control unit (ECU)
  • Corrosion of contacts or connectors

How to Fix

  1. Check the wiring harness for breaks or damage
  2. Check the operation of the fuel tank flap lock solenoid
  3. Check control circuit voltage
  4. Replace faulty components (solenoid, wiring harness, etc.)
  5. Clean contacts and connectors from corrosion

Related codes

P04C0P04C2

Error P04C1 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P04C1 code mean?

P04C1 is an OBD-II diagnostic trouble code that indicates: Fuel Fill Door Unlock Control Circuit Low

What causes a P04C1 error code?

The most common causes of P04C1 include: Open or short circuit in wiring harness; Malfunction of the fuel tank flap lock solenoid; Problems with the control unit (ECU); Corrosion of contacts or connectors.

How do I fix a P04C1 diagnostic trouble code?

To fix P04C1: Check the wiring harness for breaks or damage. Check the operation of the fuel tank flap lock solenoid. Check control circuit voltage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P04C1?

Limited driving only, diagnose soon

How much does it cost to fix P04C1?

The estimated repair cost for P04C1 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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