OBD Guide
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P05ED

Reductant Heater Control Module Supply Voltage

P05ED is an OBD-II diagnostic trouble code meaning: Reductant Heater Control Module Supply Voltage. Common causes: malfunction of the heater module power supply wiring (open circuit, short circuit), reduced on-board voltage (faulty generator, battery). Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine Light and/or AdBlue Warning Light Is On
  • SCR system does not activate in cold weather
  • Possible engine power limitation
  • Low or faulty AdBlue warning
  • Freezing of the reagent in the tank during frost

Causes

  • Malfunction of the heater module power supply wiring (open circuit, short circuit)
  • Reduced on-board voltage (faulty generator, battery)
  • Heater power relay malfunction
  • Damage or oxidation of heater module connectors
  • Malfunction of the heater control module itself

How to Fix

  1. Read all codes, pay attention to AdBlue and SCR system codes
  2. Check the voltage of the on-board network (normal: 13.5–14.5 V with the engine running)
  3. Check AdBlue heater circuit fuse
  4. Inspect the heater control module connectors for oxidation.
  5. Check heater power relay
  6. Diagnose the heater control module using a specialized scanner

Related codes

P05EEP05EFP05F0P20E8P204FP2200

Error P05ED by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05ED code mean?

P05ED is an OBD-II diagnostic trouble code that indicates: Reductant Heater Control Module Supply Voltage

What causes a P05ED error code?

The most common causes of P05ED include: Malfunction of the heater module power supply wiring (open circuit, short circuit); Reduced on-board voltage (faulty generator, battery); Heater power relay malfunction; Damage or oxidation of heater module connectors.

How do I fix a P05ED diagnostic trouble code?

To fix P05ED: Read all codes, pay attention to AdBlue and SCR system codes. Check the voltage of the on-board network (normal: 13.5–14.5 V with the engine running). Check AdBlue heater circuit fuse. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05ED?

Yes, but get it checked soon

How much does it cost to fix P05ED?

The estimated repair cost for P05ED is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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