OBD Guide
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P0598

Thermostat Heater Control Circuit Low

P0598 is an OBD-II diagnostic trouble code meaning: Thermostat Heater Control Circuit Low. Common causes: thermostat heater control wire short circuit to ground, oxidation or destruction of the thermostat connector. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–111 (est.)

Symptoms

  • Check Engine light is on
  • The engine is overheating or running at too low a temperature
  • Increased fuel consumption
  • Poor performance of the interior heating system
  • Possible burning smell from overheating coolant

Causes

  • Thermostat heater control wire short circuit to ground
  • Oxidation or destruction of the thermostat connector
  • Internal breakdown of the thermostat heating element
  • Damage to wiring (chaining of insulation)
  • Malfunction of the control circuit in the ECU (rare)

How to Fix

  1. Read all error codes with a scanner, record related codes
  2. Visually inspect the connector and wiring of the thermostat, check the integrity of the insulation
  3. Measure the voltage on the thermostat control circuit with the ignition on
  4. Check for a short to ground in the control wire using a multimeter.
  5. Measure the resistance of the thermostat heating element (the norm is indicated in the specification)
  6. Replace the thermostat if it is confirmed to be faulty
  7. Reset error codes and take a test drive

Related codes

P0597P0599P0128P0217P0115

Error P0598 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0598 code mean?

P0598 is an OBD-II diagnostic trouble code that indicates: Thermostat Heater Control Circuit Low

What causes a P0598 error code?

The most common causes of P0598 include: Thermostat heater control wire short circuit to ground; Oxidation or destruction of the thermostat connector; Internal breakdown of the thermostat heating element; Damage to wiring (chaining of insulation).

How do I fix a P0598 diagnostic trouble code?

To fix P0598: Read all error codes with a scanner, record related codes. Visually inspect the connector and wiring of the thermostat, check the integrity of the insulation. Measure the voltage on the thermostat control circuit with the ignition on. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0598?

Do not drive — repair immediately

How much does it cost to fix P0598?

The estimated repair cost for P0598 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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