OBD Guide
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P0543

Intake Air Heater A Circuit Open

P0543 is an OBD-II diagnostic trouble code meaning: Intake Air Heater A Circuit Open. Common causes: open circuit in the heater circuit, control relay fault. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Difficulty starting the engine in cold weather
  • Floating idle speed
  • Increased fuel consumption

Causes

  • Open circuit in the heater circuit
  • Control relay fault
  • Wiring harness damage
  • Failure of the heater itself

How to Fix

  1. Check the integrity of the heater circuit
  2. Check control relay
  3. Check the heater itself for breaks
  4. If necessary, replace faulty components

Related codes

P0544P0545P0546

Error P0543 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0543 code mean?

P0543 is an OBD-II diagnostic trouble code that indicates: Intake Air Heater A Circuit Open

What causes a P0543 error code?

The most common causes of P0543 include: Open circuit in the heater circuit; Control relay fault; Wiring harness damage; Failure of the heater itself.

How do I fix a P0543 diagnostic trouble code?

To fix P0543: Check the integrity of the heater circuit. Check control relay. Check the heater itself for breaks. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0543?

Yes, but get it checked soon

How much does it cost to fix P0543?

The estimated repair cost for P0543 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat