OBD Guide
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P04EC

EVAP System Large Leak Detected - Fuel Tank Side

P04EC is an OBD-II diagnostic trouble code meaning: EVAP System Large Leak Detected - Fuel Tank Side. Common causes: loose or damaged fuel cap, cracked or damaged fuel tank. Estimated repair cost: $11–222.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$11–222 (est.)

Symptoms

  • Check Engine Light Is On
  • Smell of gasoline in the fuel tank area or in the cabin
  • Difficulty starting a hot engine
  • Increased fuel consumption
  • Feeling the smell of fuel outside the car

Causes

  • Loose or damaged fuel cap
  • Cracked or damaged fuel tank
  • Rupture or crack in the EVAP system hose on the tank side
  • Faulty fuel filler valve
  • Damaged carbon adsorber or its pipes

How to Fix

  1. Check the tightness of the fuel tank cap and replace if the seal is worn
  2. Inspect all EVAP system hoses on the tank side for cracks or disconnections.
  3. Perform a smoke test on the EVAP system to pinpoint the location of the leak.
  4. Inspect the fuel tank for damage and cracks
  5. Check the condition of the carbon adsorber and its pipes
  6. Replace damaged EVAP system elements
  7. Reset the error and conduct a test drive to confirm the resolution

Related codes

P0442P0455P0456P0457P04ED

Error P04EC by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P04EC code mean?

P04EC is an OBD-II diagnostic trouble code that indicates: EVAP System Large Leak Detected - Fuel Tank Side

What causes a P04EC error code?

The most common causes of P04EC include: Loose or damaged fuel cap; Cracked or damaged fuel tank; Rupture or crack in the EVAP system hose on the tank side; Faulty fuel filler valve.

How do I fix a P04EC diagnostic trouble code?

To fix P04EC: Check the tightness of the fuel tank cap and replace if the seal is worn. Inspect all EVAP system hoses on the tank side for cracks or disconnections.. Perform a smoke test on the EVAP system to pinpoint the location of the leak.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P04EC?

Do not drive — repair immediately

How much does it cost to fix P04EC?

The estimated repair cost for P04EC is $11–222. Actual cost depends on your vehicle, location, and labor rates.

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