OBD2 Error Code P0115: How to Fix It

Q: Can I drive with error code P0115?

It's not recommended to drive with P0115 as it can cause engine overheating, poor fuel economy, and potential engine damage. The engine may run in fail-safe mode with reduced performance.

Q: How much does it cost to fix P0115?

If it's just the sensor, parts cost $15-50 and labor is typically 0.5-1.5 hours. Total repair cost ranges from $75-200 depending on your vehicle and local labor rates.

Q: What causes ECT sensor failure?

Common causes include normal wear and tear, corrosion from coolant leaks, electrical shorts, damaged wiring, or contaminated coolant that damages the sensor element.

Q: Will P0115 cause my car to overheat?

Yes, P0115 can cause overheating because the engine computer can't properly control cooling fans, fuel mixture, and timing without accurate temperature readings.

Q: How do I know if the ECT sensor or wiring is bad?

Test resistance across sensor terminals (should change with temperature) and check for 5V reference voltage at the connector. If sensor tests good but voltage is wrong, the wiring or ECM may be faulty.

Abstract

OBD2 error code P0115 indicates a malfunction in your engine's coolant temperature sensor circuit. This sensor tells your engine control module how hot or cold your coolant is running, which affects fuel mixture and engine timing. When this circuit fails, your engine may run poorly, overheat, or fail to start.