P0118
Système
Powertrain (Cooling)
Scanner requis
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.

Symptômes courants

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

Causes typiques

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

Quel scanner choisir ?

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

Utilisez les données en direct et le freeze frame avant de remplacer des pièces. Les codes ABS, SRS et U nécessitent souvent un scanner mult systèmes.

Conseils de diagnostic

  • Enregistrez le freeze frame lors de la première apparition du code
  • Effacez le code uniquement après avoir corrigé la cause
  • Vérifiez les codes en attente associés
  • Vérifiez que la batterie est au-dessus de 12,4 V avant de suspecter un capteur

Scanners FOXWELL recommandés

Questions fréquentes

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.