OBD Guide
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P04C9

Fuel Fill Door Open Request Sensor/Switch Performance/Stuck Off

P04C9 is an OBD-II diagnostic trouble code meaning: Fuel Fill Door Open Request Sensor/Switch Performance/Stuck Off. Common causes: malfunction of the sensor or switch of the fuel tank hatch, open or shorted wiring harness. Estimated repair cost: $22–56.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–56 (est.)

Symptoms

  • Check Engine Light Is On
  • Problems with refueling
  • EVAP system errors

Causes

  • Malfunction of the sensor or switch of the fuel tank hatch
  • Open or shorted wiring harness
  • Mechanical damage to the fuel tank hatch
  • Problems with sensor contacts

How to Fix

  1. Check the condition of the fuel tank hatch sensor and switch
  2. Check the integrity of the wiring harness and contacts
  3. Replace a faulty sensor or switch
  4. Clean or replace damaged contacts

Related codes

P0442P0455P0456

Error P04C9 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P04C9 code mean?

P04C9 is an OBD-II diagnostic trouble code that indicates: Fuel Fill Door Open Request Sensor/Switch Performance/Stuck Off

What causes a P04C9 error code?

The most common causes of P04C9 include: Malfunction of the sensor or switch of the fuel tank hatch; Open or shorted wiring harness; Mechanical damage to the fuel tank hatch; Problems with sensor contacts.

How do I fix a P04C9 diagnostic trouble code?

To fix P04C9: Check the condition of the fuel tank hatch sensor and switch. Check the integrity of the wiring harness and contacts. Replace a faulty sensor or switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P04C9?

Yes, but get it checked soon

How much does it cost to fix P04C9?

The estimated repair cost for P04C9 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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