OBD Guide
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P05F2

Reductant Pump Supply Voltage Circuit Stuck Off

P05F2 is an OBD-II diagnostic trouble code meaning: Reductant Pump Supply Voltage Circuit Stuck Off. Common causes: burnt or stuck pump power relay (open contacts), open circuit in the relay control circuit. Estimated repair cost: $17–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–167 (est.)

Symptoms

  • AdBlue/SCR system fault warning
  • Check Engine Light Is On
  • AdBlue consumption has stopped (the tank does not empty)
  • Increased NOx emissions
  • Possible power limitation after 1000–2000 km

Causes

  • Burnt or stuck pump power relay (open contacts)
  • Open circuit in the relay control circuit
  • Mechanical jamming of the pump (AdBlue freezing, clogging)
  • AdBlue ECU malfunction
  • Broken pump supply wire

How to Fix

  1. Try to turn on the pump manually using the diagnostic scanner (component activation)
  2. If the pump does not respond, check that there is power at its connector when the switch is commanded.
  3. Check the pump power relay - measure the resistance of the control winding (normal: 70–120 Ohms)
  4. Check the presence of a control signal on the relay from the ECU
  5. Check if AdBlue is frozen in the tank and pipes
  6. Replace the relay or repair an open circuit

Related codes

P05F1P05EEP05EFP20E8P204F

Error P05F2 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05F2 code mean?

P05F2 is an OBD-II diagnostic trouble code that indicates: Reductant Pump Supply Voltage Circuit Stuck Off

What causes a P05F2 error code?

The most common causes of P05F2 include: Burnt or stuck pump power relay (open contacts); Open circuit in the relay control circuit; Mechanical jamming of the pump (AdBlue freezing, clogging); AdBlue ECU malfunction.

How do I fix a P05F2 diagnostic trouble code?

To fix P05F2: Try to turn on the pump manually using the diagnostic scanner (component activation). If the pump does not respond, check that there is power at its connector when the switch is commanded.. Check the pump power relay - measure the resistance of the control winding (normal: 70–120 Ohms). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05F2?

Limited driving only, diagnose soon

How much does it cost to fix P05F2?

The estimated repair cost for P05F2 is $17–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat