OBD Guide
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P05D9

PCV Regulator Valve Control Circuit Low

P05D9 is an OBD-II diagnostic trouble code meaning: PCV Regulator Valve Control Circuit Low. Common causes: short circuit of the pcv valve control wire to the vehicle body, oil contamination of the connector causing contact shorting. Estimated repair cost: $22–89.

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

Symptoms

  • Check Engine Light Is On
  • Unstable idle
  • Oil leakage through seals and gaskets
  • Oily air filter or air filter housing
  • Smoke from engine breather
  • Increased oil consumption

Causes

  • Short circuit of the PCV valve control wire to the vehicle body
  • Oil contamination of the connector causing contact shorting
  • Internal short in PCV regulator valve coil
  • Mechanical damage to wiring insulation in high temperature zones
  • Overcurrent due to charring of valve winding

How to Fix

  1. Read all fault codes, record related codes
  2. Disconnect the PCV valve connector and check if the code goes away - if so, the problem is in the valve itself
  3. Measure the resistance of the valve winding: when closed it will be close to zero
  4. Inspect the connector and wiring for oil contamination, melted insulation, and traces of corrosion.
  5. Test the control wire from the ECU to the valve for a short to ground.
  6. Replace the PCV regulator valve and re-insulate the wiring if necessary.

Related codes

P05D8P05DAP0171P051BP052E

Error P05D9 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05D9 code mean?

P05D9 is an OBD-II diagnostic trouble code that indicates: PCV Regulator Valve Control Circuit Low

What causes a P05D9 error code?

The most common causes of P05D9 include: Short circuit of the PCV valve control wire to the vehicle body; Oil contamination of the connector causing contact shorting; Internal short in PCV regulator valve coil; Mechanical damage to wiring insulation in high temperature zones.

How do I fix a P05D9 diagnostic trouble code?

To fix P05D9: Read all fault codes, record related codes. Disconnect the PCV valve connector and check if the code goes away - if so, the problem is in the valve itself. Measure the resistance of the valve winding: when closed it will be close to zero. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05D9?

Yes, but get it checked soon

How much does it cost to fix P05D9?

The estimated repair cost for P05D9 is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat