OBD Guide
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P039A

Cylinder 1 Pressure Too Low

P039A is an OBD-II diagnostic trouble code meaning: Cylinder 1 Pressure Too Low. Common causes: piston ring wear, damage to valves. Estimated repair cost: $56–222.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Power Loss
  • Unstable engine operation
  • Increased fuel consumption
  • Misfires

Causes

  • Piston ring wear
  • Damage to valves
  • Compression leak
  • Spark plug fault
  • Problems with the fuel injector

How to Fix

  1. Check compression in cylinder 1
  2. Inspect the spark plug and fuel injector
  3. Check the condition of valves and piston rings
  4. Replace faulty components

Related codes

P0301P0302P0171P0172

Error P039A by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P039A code mean?

P039A is an OBD-II diagnostic trouble code that indicates: Cylinder 1 Pressure Too Low

What causes a P039A error code?

The most common causes of P039A include: Piston ring wear; Damage to valves; Compression leak; Spark plug fault.

How do I fix a P039A diagnostic trouble code?

To fix P039A: Check compression in cylinder 1. Inspect the spark plug and fuel injector. Check the condition of valves and piston rings. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P039A?

Limited driving only, diagnose soon

How much does it cost to fix P039A?

The estimated repair cost for P039A is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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