OBD Guide
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P05F3

Exhaust Aftertreatment Power Relay Control Circuit/Open

P05F3 is an OBD-II diagnostic trouble code meaning: Exhaust Aftertreatment Power Relay Control Circuit/Open. Common causes: open relay coil control circuit, blown relay control circuit fuse. Estimated repair cost: $22–167.

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

Symptoms

  • Check Engine Light and Emissions Control Warning Light Illuminates
  • Complete failure of the SCR or DPF system
  • No activation of the system when the ignition is turned on
  • Increased emissions
  • Possible power limitation after some time

Causes

  • Open relay coil control circuit
  • Blown relay control circuit fuse
  • Relay control connector oxidation
  • ECU malfunction (does not generate a control signal)
  • Mechanical damage to the relay (broken control winding)

How to Fix

  1. Read all codes, check for associated SCR/DPF/AdBlue codes
  2. Locate the aftertreatment power relay in the fuse box
  3. Check relay control circuit fuse
  4. Measure the resistance of the relay control winding (normal: 70–120 Ohm, open circuit - infinity)
  5. Check the presence of a control signal from the ECU to the relay (relay activation by scanner)
  6. Replace the relay or repair an open circuit in the control circuit

Related codes

P05F4P05F5P05F6P05F7P20E8P204F

Error P05F3 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05F3 code mean?

P05F3 is an OBD-II diagnostic trouble code that indicates: Exhaust Aftertreatment Power Relay Control Circuit/Open

What causes a P05F3 error code?

The most common causes of P05F3 include: Open relay coil control circuit; Blown relay control circuit fuse; Relay control connector oxidation; ECU malfunction (does not generate a control signal).

How do I fix a P05F3 diagnostic trouble code?

To fix P05F3: Read all codes, check for associated SCR/DPF/AdBlue codes. Locate the aftertreatment power relay in the fuse box. Check relay control circuit fuse. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05F3?

Limited driving only, diagnose soon

How much does it cost to fix P05F3?

The estimated repair cost for P05F3 is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat