OBD Guide
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P04C2

Fuel Fill Door Unlock Control Circuit High

P04C2 is an OBD-II diagnostic trouble code meaning: Fuel Fill Door Unlock Control Circuit High. Common causes: short circuit to power in the actuator control circuit, malfunction of the fuel tank cap lock actuator. Estimated repair cost: $22–89.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–89 (est.)

Symptoms

  • The fuel filler cap does not open with the button
  • Check Engine Light Is On
  • It is impossible to refuel the car in the normal way
  • Lid locked in closed position

Causes

  • Short circuit to power in the actuator control circuit
  • Malfunction of the fuel tank cap lock actuator
  • Damage to wiring or connector
  • ECU malfunction
  • Oxidation of connector contacts

How to Fix

  1. Read and write error codes with a diagnostic scanner
  2. Check the voltage in the actuator control circuit using a multimeter
  3. Inspect the wiring and connector of the actuator for damage and oxidation
  4. Check the lock actuator for proper resistance
  5. Eliminate short circuit or replace damaged section of wiring
  6. Replace the actuator if necessary
  7. Reset the error code and check the system operation

Related codes

P04C6P04DCP04C1

Error P04C2 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P04C2 code mean?

P04C2 is an OBD-II diagnostic trouble code that indicates: Fuel Fill Door Unlock Control Circuit High

What causes a P04C2 error code?

The most common causes of P04C2 include: Short circuit to power in the actuator control circuit; Malfunction of the fuel tank cap lock actuator; Damage to wiring or connector; ECU malfunction.

How do I fix a P04C2 diagnostic trouble code?

To fix P04C2: Read and write error codes with a diagnostic scanner. Check the voltage in the actuator control circuit using a multimeter. Inspect the wiring and connector of the actuator for damage and oxidation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P04C2?

Yes, but get it checked soon

How much does it cost to fix P04C2?

The estimated repair cost for P04C2 is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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