OBD Guide
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P05F7

Exhaust Aftertreatment Power Relay Control Circuit Stuck Off

P05F7 is an OBD-II diagnostic trouble code meaning: Exhaust Aftertreatment Power Relay Control Circuit Stuck Off. Common causes: mechanical jamming of relay contacts in the open position, break inside the relay (burnt contacts). Estimated repair cost: $11–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–167 (est.)

Symptoms

  • Immediate warning of AdBlue/SCR system failure
  • Complete failure of the exhaust aftertreatment system
  • Check Engine Light Is On
  • Increased NOx and soot emissions
  • Engine power limitation

Causes

  • Mechanical jamming of relay contacts in the open position
  • Break inside the relay (burnt contacts)
  • Blown relay load circuit fuse
  • ECU malfunction (no control signal)
  • Break in the power wire at the relay output

How to Fix

  1. Check the presence of a control signal on the relay from the ECU (multimeter or oscilloscope)
  2. If there is a control signal, replace the relay
  3. Check the relay load circuit fuse
  4. Check the voltage at the input and output of the relay when trying to turn on
  5. If there is no control signal from the ECU, diagnose the ECU
  6. Replace the relay and check the system

Related codes

P05F6P05F3P05F4P05F5P20E8P204F

Error P05F7 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05F7 code mean?

P05F7 is an OBD-II diagnostic trouble code that indicates: Exhaust Aftertreatment Power Relay Control Circuit Stuck Off

What causes a P05F7 error code?

The most common causes of P05F7 include: Mechanical jamming of relay contacts in the open position; Break inside the relay (burnt contacts); Blown relay load circuit fuse; ECU malfunction (no control signal).

How do I fix a P05F7 diagnostic trouble code?

To fix P05F7: Check the presence of a control signal on the relay from the ECU (multimeter or oscilloscope). If there is a control signal, replace the relay. Check the relay load circuit fuse. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05F7?

Limited driving only, diagnose soon

How much does it cost to fix P05F7?

The estimated repair cost for P05F7 is $11–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat