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P0115 is a diagnostic trouble code (DTC) for "ECT Sensor Circuit Malfunction Problem". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Engine Coolant Temperature (ECT) sensor circuit malfunction problem
P0115 is the OBD-II generic code that indicates when the engine control module (ECM) reads the ECT sensor input go below or above the sensors expected range of 0.14 to 4.91 V (-40°C to 140°C -40°F to 284°F).
The ECT sensor range input to the ECM went to -40°F or above 284°F indicating a short or open circuit.
Codes P0117 or P0118 for a short or open circuit usually accompany code P0115.
The ECM turns on the Check Engine Light and goes into failsafe mode substituting input to 176 degrees F.
Engine may have a hard start when engine is cold and start normal when warm
Engine may run rough and hesitate until the engine warms up
Engine should run close to normal once the engine warms up
Note: The symptoms are determined by the manufacturer failsafe ECM strategy for the vehicle during a failure and may vary between manufacturers and vehicles.
Scans and documents the codes received and view the freeze frame data to see when the code was set
Resets the codes to clear the OBD-II fault codes and retests the vehicle to see if the code comes back
If Codes P0117 or P0118 are received, the mechanic follows tests for these codes first.
Not performing a visual inspection first
Not performing tests on codes P0117 or P0118 first
Not replacing ECT sensor unless tests indicate a problem
Not connecting the new ECT sensor and viewing the ECM data to see if the temperature output from the sensor is close to the same as ambient temperature before installation
The P0115 code will cause the engine ECM to go into a failsafe mode.
The failsafe mode may cause various drive complaints until the engine warms up depending on the manufacturer failsafe mode strategy.
The P0115 code is often associated with P0116, P0117, P0118, and P0119 codes.
Most failures for code P0115 is a harness shorting or a connector corrosion issue causing an open circuit.
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