Nissan X-Trail P0118: Engine Coolant Temperature Sensor Circuit → High Input


P0118 It is a common OBDII fault code. It is a general code, which means that it will have the same meaning for the Nissan X-Trail like any other vehicle.

P0118: Engine Coolant Temperature Sensor Circuit → High Input

This code is thrown when the resistance coming from the coolant temperature sensor does not change when the vehicle warms up.

Nissan X-Trail P01P0118 Nissan X-Trail18 Symptoms

P0118 is sometimes accompanied by notable symptoms. These symptoms include misfiring, rough idling, misfiring, decreased fuel economy, and the check engine light.

It’s just as likely that the only sign you’ll get from the X-Trail is the check engine light itself.

As P0118 can greatly affect the handling of your X-Trail, we recommend that you fix it as soon as possible.

Nissan X-Trail P0118 Diagnostics

Causes of P0118: Nissan X-Trail

Most of the time, the cause of P0118 is going to be related to the wiring or the sensor in one way or another.

Here’s a great video from CarNToys on YouTube about this very problem.

Wiring problem

It’s a good idea to start diagnosing your X-Trail’s P0118 at the wiring harness. It is often the reason code is released. It is also cheap and easy to diagnose.

Start by inspecting where the harness connects to the temperature sensor. Next, inspect the harness for wiring problems. Here’s a great guide on inspecting your wiring harness.

The sensor itself

After thoroughly evaluating the wiring harness, it would be time to take a look at the sensor itself. It works by receiving a 5-volt signal from the computer and the ground. Voltage drops as it heats up. If you are not getting 5 volts, re-inspect the wiring harness.

If you have a voltmeter, you can check the signal that comes out of it as the engine warms up. If it remains the same, then the sensor is not working properly.

Replacing the sensor directly is not a big bet. They are very affordable.

Other causes

There may be other causes of P0118 on your X-Trail. However, they are not usually that frequent. A faulty PCM can cause the code to activate.

Engine coolant can cause the code to be thrown if it corrodes enough. So, if you find yourself in a situation where you can’t remember the last time the coolant was changed, it may be worth trying to change it and see if you have any luck.


Most of the time, P0118 is going to be caused by a bad temperature sensor. Wiring problems are the next most likely cause. Good luck diagnosing your X-Trail!

If there is anything you think you can add to the article, feel free to leave a comment below.


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