OBD Guide
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P05F6

Exhaust Aftertreatment Power Relay Control Circuit Stuck On

P05F6 is an OBD-II diagnostic trouble code meaning: Exhaust Aftertreatment Power Relay Control Circuit Stuck On. Common causes: welded or stuck power relay contacts, contamination of relay contacts (arc wear). Estimated repair cost: $11–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • AdBlue/SCR system components operate when the ignition is switched off
  • Battery drain overnight
  • Check Engine Light Is On
  • Overconsumption of AdBlue reagent
  • Increased wear on the pump and system heaters

Causes

  • Welded or stuck power relay contacts
  • Contamination of relay contacts (arc wear)
  • Poor quality relay with a defective contact group
  • Long-term operation of the relay at high current (overload)

How to Fix

  1. Check the presence of voltage at the relay output with the ignition off
  2. Remove the aftertreatment system power relay - the components should stall.
  3. Measure the resistance between the contacts of the removed relay (welding - close to zero)
  4. Replace the aftertreatment system power relay
  5. After replacement, check the current consumption with the ignition off
  6. Make sure there are no other system codes

Related codes

P05F7P05F3P05F4P05F5P20E8

Error P05F6 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05F6 code mean?

P05F6 is an OBD-II diagnostic trouble code that indicates: Exhaust Aftertreatment Power Relay Control Circuit Stuck On

What causes a P05F6 error code?

The most common causes of P05F6 include: Welded or stuck power relay contacts; Contamination of relay contacts (arc wear); Poor quality relay with a defective contact group; Long-term operation of the relay at high current (overload).

How do I fix a P05F6 diagnostic trouble code?

To fix P05F6: Check the presence of voltage at the relay output with the ignition off. Remove the aftertreatment system power relay - the components should stall.. Measure the resistance between the contacts of the removed relay (welding - close to zero). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05F6?

Yes, but get it checked soon

How much does it cost to fix P05F6?

The estimated repair cost for P05F6 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat