OBD Guide
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P03CF

Cylinder 6 Pressure Variation High

P03CF is an OBD-II diagnostic trouble code meaning: Cylinder 6 Pressure Variation High. Common causes: unstable fuel supply to the injector of cylinder 6 (stuck injector), detonation in cylinder 6 due to incorrect mixture. Estimated repair cost: $33–222.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–222 (est.)

Symptoms

  • Check Engine light on
  • Unstable or harsh engine sound
  • Intermittent knocking noises when accelerating
  • Loss of engine power (due to ECU protection limitation)
  • Increased fuel consumption

Causes

  • Unstable fuel supply to the injector of cylinder 6 (stuck injector)
  • Detonation in cylinder 6 due to incorrect mixture
  • Uneven operation of the ignition system
  • Problems with the fuel pressure regulator
  • Contamination of the intake tract or valves of cylinder 6

How to Fix

  1. Check the injector of cylinder 6 - inspect the spray, check for sticking
  2. Check the pressure in the fuel system and the operation of the pressure regulator
  3. Diagnose the ignition system of cylinder 6 (spark plug, coil)
  4. Inspect the intake valve and combustion chamber for carbon deposits
  5. Read real-time data and compare pressure variation between cylinders
  6. Eliminate the identified cause, reset the codes and conduct a test drive

Related codes

P03CEP03C8P03AFP0306

Error P03CF by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P03CF code mean?

P03CF is an OBD-II diagnostic trouble code that indicates: Cylinder 6 Pressure Variation High

What causes a P03CF error code?

The most common causes of P03CF include: Unstable fuel supply to the injector of cylinder 6 (stuck injector); Detonation in cylinder 6 due to incorrect mixture; Uneven operation of the ignition system; Problems with the fuel pressure regulator.

How do I fix a P03CF diagnostic trouble code?

To fix P03CF: Check the injector of cylinder 6 - inspect the spray, check for sticking. Check the pressure in the fuel system and the operation of the pressure regulator. Diagnose the ignition system of cylinder 6 (spark plug, coil). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P03CF?

Do not drive — repair immediately

How much does it cost to fix P03CF?

The estimated repair cost for P03CF is $33–222. Actual cost depends on your vehicle, location, and labor rates.

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