OBD Guide
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P05C4

Engine Coolant Pressure Sensor Circuit Low

P05C4 is an OBD-II diagnostic trouble code meaning: Engine Coolant Pressure Sensor Circuit Low. Common causes: short circuit of the sensor signal wire to ground, break in the power wire (+5v) of the pressure sensor. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Check Engine Light Is On
  • The scanner shows zero or abnormally low coolant pressure readings
  • Possible engine emergency mode
  • Cooling system warning on display
  • At real low pressure - signs of a coolant leak

Causes

  • Short circuit of the sensor signal wire to ground
  • Break in the power wire (+5V) of the pressure sensor
  • Complete failure of the coolant pressure sensor
  • Real pressure drop in the cooling system (leakage, pump failure)
  • Oxidation or poor contact in the sensor connector

How to Fix

  1. Connect the scanner, check the pressure readings - if the pressure shows 0 with the engine running, this is an anomaly
  2. Visually inspect the cooling system for leaks, check the fluid level
  3. Disconnect the sensor connector and measure the reference voltage (should be about 5V)
  4. Check the signal wire for a short to ground with a multimeter (with the sensor disconnected)
  5. Connect the sensor back, start the engine, compare the scanner readings with the real pressure (pressure gauge)
  6. Replace the sensor if the wiring is in good condition; repair the wiring if a short circuit or break is detected

Related codes

P05C2P05C3P05C5P05C6P0217

Error P05C4 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P05C4 code mean?

P05C4 is an OBD-II diagnostic trouble code that indicates: Engine Coolant Pressure Sensor Circuit Low

What causes a P05C4 error code?

The most common causes of P05C4 include: Short circuit of the sensor signal wire to ground; Break in the power wire (+5V) of the pressure sensor; Complete failure of the coolant pressure sensor; Real pressure drop in the cooling system (leakage, pump failure).

How do I fix a P05C4 diagnostic trouble code?

To fix P05C4: Connect the scanner, check the pressure readings - if the pressure shows 0 with the engine running, this is an anomaly. Visually inspect the cooling system for leaks, check the fluid level. Disconnect the sensor connector and measure the reference voltage (should be about 5V). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P05C4?

Limited driving only, diagnose soon

How much does it cost to fix P05C4?

The estimated repair cost for P05C4 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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