OBD Guide
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P04FC

Crankcase Ventilation System Performance

P04FC is an OBD-II diagnostic trouble code meaning: Crankcase Ventilation System Performance. Common causes: clogged or faulty pcv valve, clogged crankcase ventilation hoses. Estimated repair cost: $17–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Check Engine Light Is On
  • Increased oil consumption
  • The smell of burning oil or smoke coming from under the hood
  • Oil deposits in the intake manifold and throttle body
  • Unstable engine operation at idle
  • Oil leaks through seals

Causes

  • Clogged or faulty PCV valve
  • Clogged crankcase ventilation hoses
  • Rupture or crack in PCV hose
  • Excessive blow-by due to worn piston rings
  • Malfunction of the oil separator (separator)
  • Frozen hose or PCV valve in cold weather

How to Fix

  1. Read error codes and check freeze frame data
  2. Inspect the PCV valve - shake it, it should rattle characteristically (if it is a ball type)
  3. Check PCV hoses for cracks, hardening and blockages
  4. Check the crankcase pressure with the engine running
  5. Replace the PCV valve if clogged or broken
  6. Clean or replace clogged ventilation hoses
  7. Check the oil separator and replace if necessary
  8. Reset the error and take a test drive

Related codes

P04E1P04FBP051CP0171P0507

Error P04FC by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P04FC code mean?

P04FC is an OBD-II diagnostic trouble code that indicates: Crankcase Ventilation System Performance

What causes a P04FC error code?

The most common causes of P04FC include: Clogged or faulty PCV valve; Clogged crankcase ventilation hoses; Rupture or crack in PCV hose; Excessive blow-by due to worn piston rings.

How do I fix a P04FC diagnostic trouble code?

To fix P04FC: Read error codes and check freeze frame data. Inspect the PCV valve - shake it, it should rattle characteristically (if it is a ball type). Check PCV hoses for cracks, hardening and blockages. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P04FC?

Limited driving only, diagnose soon

How much does it cost to fix P04FC?

The estimated repair cost for P04FC is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat