P0118
Sistema
Powertrain (Cooling)
Scanner richiesto
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.

Sintomi comuni

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

Cause tipiche

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

Quale scanner ti serve?

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

Usa dati live e freeze frame prima di sostituire componenti. I codici ABS, SRS e U richiedono spesso uno scanner mult sistema.

Consigli diagnostici

  • Registra il freeze frame quando il codice compare la prima volta
  • Cancella il codice solo dopo aver risolto la causa
  • Controlla i codici pending correlati
  • Verifica che la batteria sia sopra 12,4 V prima di sospettare un sensore

Scanner FOXWELL consigliati

Domande frequenti

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.