Question 1

What does P0118 mean?

Accepted Answer

P0118 - ECT Circuit High Input. ECT sensor reporting extremely low temperature (open circuit). PCM thinks engine is freezing cold.

Question 2

What are the symptoms of P0118?

Accepted Answer

Check engine light, Engine runs rich, Poor fuel economy, Fan may not turn on, Black smoke

Question 3

What causes P0118?

Accepted Answer

Open circuit in ECT wiring, Disconnected sensor, Failed ECT sensor, Corroded connector

Question 4

How much does it cost to fix P0118?

Accepted Answer

Typical repair cost: $20-$200. When PCM thinks engine is cold, it adds extra fuel — hence poor economy and black smoke.

P0118 — ECT Circuit High Input

Don't guess — diagnose P0118 the right way