P0115 - OBD Trouble Code

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The P0115 OBD-II code can be defined as an engine coolant temperature circuit malfunction. This error code is set when the powertrain control module sees erratic or irrational voltage signals from the coolant temperature circuit.

If you want to learn something more about this fault code, then you have arrived as the right place. An engine coolant temperature sensor is used to detect the engine coolant temperature. This sensor helps in modifying a voltage sensor from the engine control module. Then the signal which has been modified returns to the engine control module as the engine coolant temperature input. A thermistor is used by the sensor which is sensitive to the change in the temperature. The electrical resistance of the thermistor would decrease with the increase in the temperature.

What causes this problem with the Engine Coolant Temperature Circuit Malfunction?

• The wiring or connector at the sensor might be damaged
• The connector or wirings might be faulty or corroded
• The engine coolant can be corroded or rusted
• The issue of open or short in signal circuit
• Open or short in reference signal circuit
• There can be some faults in the powertrain control module

1. Wiring - OBD Code P0115 can appear because of faulty Wiring.
2. Engine Sensor - There can be some issues with the Engine Sensor due to which you may see P0115 code appearing over and over again. Visit us to buy best quality Sensor online.
3. Connector - Are you facing some faults in your Connector? Don’t worry and get them replaced or else P0115 code can turn up.
4. Engine Coolant - The P0115 code can also arise due to some issues in Engine Coolant. So, it is advised to replace them as soon as possible.
5. Powertrain Control Module - Do you remember when was the last time you got your car Powertrain Control Module checked up? A damaged Powertrain Control Module can cause a lot of issues like displaying P0115 code.
6. Engine Control Module - Faulty Engine Control Module can be the reason why P0115 code is flashing. Visit us to purchase top notch Engine Control Module online.
7. Air Fuel Ratio - There can be some issues of Air Fuel Ratio. A faulty Air Fuel Ratio can be a reason behind the flashing up of P0115 code.
8. Ignition System - Everything is okay with the timing chain and still OBD code P0115 triggering? Then there must be some defects in Ignition System. Replace them as soon as possible.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0115 here:

Common Symptoms

• There can be an issue of hard starting
• The car engine may start dying
• The problem of rough running
• Engine may start hesitating until it warms up
• There can be backfire in tailpipe
• Cooling fans constantly running when they shouldn’t be, or not run at all when they should be
• The car engine can start running lean and increase emission

• The ECT connector should be repaired or replaced
• You can always repair or replace the wiring if needed
• The ECT should be replaced with a new sensor

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• Carefully scan and document the codes which are received and view the freeze frame data to see when the code was set.
• You can always reset the codes to clear the OBD-II fault codes and retest the vehicle to see if the code comes back 

Common Mistakes When Diagnosing The P0115 Code

• The most common mistake is to not perform a visual inspection first
• Make sure that you perform tests on codes P0117 or P0118 first
• The ECT sensor should not be replaced unless tests indicate a problem
• Not connecting the new ECT sensor can turn out to be a big mistake and viewing the ECM data to see if the temperature output from the sensor is close to the same as ambient temperature before installation