OBD Guide
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P04CB

Fuel Fill Door Open Request Sensor/Switch Circuit High

P04CB is an OBD-II diagnostic trouble code meaning: Fuel Fill Door Open Request Sensor/Switch Circuit High. Common causes: fuel tank door opening request sensor/switch malfunction, open or short circuit in 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 malfunction

Causes

  • Fuel tank door opening request sensor/switch malfunction
  • Open or short circuit in wiring harness
  • Poor connection or corroded contacts
  • Engine control unit (ECU) malfunction

How to Fix

  1. Check the condition of the fuel tank door opening request sensor/switch
  2. Inspect the wiring harness for damage
  3. Check connections and contacts for corrosion
  4. If necessary, replace the sensor or repair the wiring harness
  5. Reset the error and check if it returns

Related codes

P0442P0455P0456

Error P04CB by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P04CB code mean?

P04CB is an OBD-II diagnostic trouble code that indicates: Fuel Fill Door Open Request Sensor/Switch Circuit High

What causes a P04CB error code?

The most common causes of P04CB include: Fuel tank door opening request sensor/switch malfunction; Open or short circuit in wiring harness; Poor connection or corroded contacts; Engine control unit (ECU) malfunction.

How do I fix a P04CB diagnostic trouble code?

To fix P04CB: Check the condition of the fuel tank door opening request sensor/switch. Inspect the wiring harness for damage. Check connections and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P04CB?

Yes, but get it checked soon

How much does it cost to fix P04CB?

The estimated repair cost for P04CB is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat