OBD Guide
ENFRDEESPT

P20C8

Reductant Heater D Control Circuit High

P20C8 is an OBD-II diagnostic trouble code meaning: Reductant Heater D Control Circuit High. Common causes: short circuit in the heater circuit, heating element malfunction. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Performance degradation
  • Possible SCR system error messages
  • Increased emissions

Causes

  • Short circuit in the heater circuit
  • Heating element malfunction
  • Problems with the wiring harness or connectors
  • Heater control module malfunction
  • Problems with the engine ECU

How to Fix

  1. Check the integrity of the heater circuit
  2. Test the resistance of the heating element
  3. Inspect connectors and wiring harness for damage
  4. Check the operation of the heater control module
  5. If necessary, replace faulty components

Related codes

P20C7P20C9P20CA

Error P20C8 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P20C8 code mean?

P20C8 is an OBD-II diagnostic trouble code that indicates: Reductant Heater D Control Circuit High

What causes a P20C8 error code?

The most common causes of P20C8 include: Short circuit in the heater circuit; Heating element malfunction; Problems with the wiring harness or connectors; Heater control module malfunction.

How do I fix a P20C8 diagnostic trouble code?

To fix P20C8: Check the integrity of the heater circuit. Test the resistance of the heating element. Inspect connectors and wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P20C8?

Yes, but get it checked soon

How much does it cost to fix P20C8?

The estimated repair cost for P20C8 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat