P0115 – Engine Coolant Temperature Sensor Circuit Malfunction

System: Engine
Dashboard light: Check engine light (MIL)
Check-engine blink code: —
Applies to: Generic OBD-II meaning. Not every code is used by this car.
Description: Engine Coolant Temperature Sensor Circuit Malfunction
Detection / symptoms: 1.Check engine light on 2.Vehicle may be hard to start 3.May blow a lot of black smoke and run extremely rich 4.Engine may want to die or backfire in tailpipe 5.Engine may run lean and increased Nox emissions may be apparent (Requires gas analyzer) 6.Cooling fans may run all the time when they shouldn't be, or not at all when they should be
Possible causes: 1.Usually the cause can be traced to a bad 2.ECT sensor 3.Wiring or connector damaged at sensor 4.Open or short in reference or signal circuit 5.Open or short in signal circuit 6.Bad PCM
What to check: 1.Read the code and freeze-frame data with an OBD-II scanner 2.Check the connector and wiring of the part named in the code 3.Test the part with scanner live data or a multimeter, using the values in the repair manual 4.Fix the cause, clear the code and test-drive
Confidence: medium (generic OBD-II definition, not checked against the factory manual for this car)

Generic OBD-II meaning (obd-codes.com), not checked against this car's factory manual. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights