OBD Guide
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P20A2

Reductant Purge Control Valve A Circuit Low

P20A2 is an OBD-II diagnostic trouble code meaning: Reductant Purge Control Valve A Circuit Low. Common causes: open or short circuit in valve circuit, reagent purge valve malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • The Check Engine light comes on
  • Increased NOx emissions
  • Possible reduction in engine power
  • SCR error message on dashboard
  • Inability to refill AdBlue

Causes

  • Open or short circuit in valve circuit
  • Reagent purge valve malfunction
  • Connector problems or contact corrosion
  • SCR control module malfunction
  • Wiring harness damage

How to Fix

  1. Check the integrity of the reagent purification valve circuit
  2. Check the resistance of the reagent purge valve
  3. Inspect connectors and wiring for damage
  4. If necessary, replace the reagent purge valve
  5. Check and, if necessary, replace the SCR control module
  6. Clear error codes and check if error is returned

Related codes

P20A0P20A1P20A3

Error P20A2 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P20A2 code mean?

P20A2 is an OBD-II diagnostic trouble code that indicates: Reductant Purge Control Valve A Circuit Low

What causes a P20A2 error code?

The most common causes of P20A2 include: Open or short circuit in valve circuit; Reagent purge valve malfunction; Connector problems or contact corrosion; SCR control module malfunction.

How do I fix a P20A2 diagnostic trouble code?

To fix P20A2: Check the integrity of the reagent purification valve circuit. Check the resistance of the reagent purge valve. Inspect connectors and wiring for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P20A2?

Yes, but get it checked soon

How much does it cost to fix P20A2?

The estimated repair cost for P20A2 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat