P0118
Systeem
Powertrain (Cooling)
Scanner vereist
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Engine Coolant Temperature Circuit High Input

Understand P0118, common causes, and the right FOXWELL scanner to diagnose it.

The ECU sees unrealistically high coolant temperature — often a failed ECT sensor, wiring short, or actual overheating.

Veelvoorkomende symptomen

  • Temperature gauge pegged hot
  • Check engine light
  • Possible limp mode or fan always on

Typische oorzaken

  • Failed ECT sensor
  • Short to voltage in sensor circuit
  • Low coolant causing sensor dry-out
  • Actual engine overheating

Welke scanner heb je nodig?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Gebruik live data en freeze frame voordat je onderdelen vervangt. ABS-, SRS- en U-codes vereisen meestal een full-system scanner.

Diagnosetips

  • Leg freeze frame vast wanneer de code voor het eerst verschijnt
  • Wis de code pas na het oplossen van de oorzaak
  • Controleer op gerelateerde pending codes
  • Controleer of accuspanning boven 12,4 V is voordat je sensoren suspecteert

Aanbevolen FOXWELL scanners

Veelgestelde vragen

Can I diagnose P0118 with a basic code reader?
P0118 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P0118?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.