OBD Guide
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P05EF

Reductant Pump Supply Voltage Circuit Low

P05EF is an OBD-II diagnostic trouble code meaning: Reductant Pump Supply Voltage Circuit Low. Common causes: oxidation of the pump power connector (increased resistance), poor contact in the pump ground circuit. Estimated repair cost: $22–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–167 (est.)

Symptoms

  • AdBlue system fault warning
  • Check Engine Light Is On
  • Unstable operation of the SCR system
  • Increased NOx emissions
  • AdBlue pump is unstable or has reduced performance

Causes

  • Oxidation of the pump power connector (increased resistance)
  • Poor contact in the pump ground circuit
  • Short circuit of the power supply to ground (additional voltage drop)
  • Reduced on-board voltage (weak battery, faulty generator)
  • Damage to the AdBlue pump wiring harness

How to Fix

  1. Check the on-board voltage with the engine running (normal: 13.5–14.5V)
  2. Check the voltage at the AdBlue pump power terminals when turned on.
  3. Measure the voltage drop on the power circuit (no more than 0.5V is acceptable)
  4. Clean and treat the contacts of the pump power connector
  5. Check and clean the ground points of the AdBlue pump
  6. Check the pump relay for voltage drop across the contacts

Related codes

P05EEP05F0P05EDP20E8P204F

Error P05EF by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05EF code mean?

P05EF is an OBD-II diagnostic trouble code that indicates: Reductant Pump Supply Voltage Circuit Low

What causes a P05EF error code?

The most common causes of P05EF include: Oxidation of the pump power connector (increased resistance); Poor contact in the pump ground circuit; Short circuit of the power supply to ground (additional voltage drop); Reduced on-board voltage (weak battery, faulty generator).

How do I fix a P05EF diagnostic trouble code?

To fix P05EF: Check the on-board voltage with the engine running (normal: 13.5–14.5V). Check the voltage at the AdBlue pump power terminals when turned on.. Measure the voltage drop on the power circuit (no more than 0.5V is acceptable). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05EF?

Limited driving only, diagnose soon

How much does it cost to fix P05EF?

The estimated repair cost for P05EF is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat