Question 1

What does P0115 mean?

Accepted Answer

P0115 - Engine Coolant Temperature (ECT) Sensor Circuit. The ECT sensor is reporting values outside the expected range.

Question 2

What are the symptoms of P0115?

Accepted Answer

Check engine light, Poor cold-start performance, Fan issues, Rich/lean condition, Incorrect temp gauge

Question 3

What causes P0115?

Accepted Answer

Failed ECT sensor, Wiring issue, Corroded connector, Low coolant level exposing sensor, Thermostat stuck

Question 4

How much does it cost to fix P0115?

Accepted Answer

Typical repair cost: $20-$200. ECT sensors are cheap ($10-25). But first check coolant level — sensor not submerged gives crazy readings.

P0115 — Engine Coolant Temperature (ECT) Sensor Circuit

Don't guess — diagnose P0115 the right way