OBD Guide
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P050C

Cold Start Engine Coolant Temperature Performance

P050C is an OBD-II diagnostic trouble code meaning: Cold Start Engine Coolant Temperature Performance. Common causes: faulty coolant temperature sensor (dtozh), thermostat stuck open. Estimated repair cost: $6–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–167 (est.)

Symptoms

  • Long engine warm-up
  • Unstable engine operation at idle
  • Increased fuel consumption
  • Reduced efficiency of the interior heating system
  • Possible misfires during warm-up

Causes

  • Faulty coolant temperature sensor (DTOZH)
  • Thermostat stuck open
  • Problems with the temperature sensor wiring harness
  • Low coolant level
  • Malfunction of the DTOZH heater circuit (if provided)
  • Problems with the engine control unit (ECU)

How to Fix

  1. Check the level and condition of the coolant
  2. Carry out diagnostics of the thermostat (warm up the engine before opening)
  3. Check the DTOZh readings with a scanner and compare with the actual temperature
  4. Inspect the wiring harness and sensor connector for corrosion and damage.
  5. If necessary, replace the coolant temperature sensor
  6. Replacing the thermostat when a malfunction is detected
  7. Flush the cooling system if there is contamination
  8. Check the operation of the sensor heating circuit (if provided for in the design)
  9. Reset error code after repair

Related codes

P0115P0116P0117P0118P0125

Error P050C by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P050C code mean?

P050C is an OBD-II diagnostic trouble code that indicates: Cold Start Engine Coolant Temperature Performance

What causes a P050C error code?

The most common causes of P050C include: Faulty coolant temperature sensor (DTOZH); Thermostat stuck open; Problems with the temperature sensor wiring harness; Low coolant level.

How do I fix a P050C diagnostic trouble code?

To fix P050C: Check the level and condition of the coolant. Carry out diagnostics of the thermostat (warm up the engine before opening). Check the DTOZh readings with a scanner and compare with the actual temperature. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P050C?

Limited driving only, diagnose soon

How much does it cost to fix P050C?

The estimated repair cost for P050C is $6–167. Actual cost depends on your vehicle, location, and labor rates.

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