P0116 Code: Engine Coolant Temperature Sensor 1 Circuit Range/Performance

The Engine Coolant Temperature (ECT) sensor is one of the many devices that relay information to your vehicle’s primary computer (Powertrain Control Module or PCM). The input from this sensor is used by the PCM for engine management and cooling fan operation. When the module detects erratic or irrational signals from this sensor, the P0116 code is set.

Here is a quick overview of what you need to know about the P0116 code.

What Does the P0116 Code Mean?

Diagnostic trouble code (DTC) P0116 stands for “Engine Coolant Temperature Sensor 1 Circuit Range/Performance.”

This DTC is triggered by the PCM after it detects that the voltage signals relayed by the engine coolant temperature (ECT) sensor fall outside the normal manufacturer-specified range.

The ECT sensor is a thermistor—a resistor that changes resistance based on temperature. This typically comes as a two-wire sensor that can be found in the block or cylinder head. One wire connects it to the PCM which supplies it with a 5 Volt supply, while the other is a ground.

A change in coolant temperature will cause a change in resistance on the ECT sensor’s signal wire. This data is used by the PCM to determine the current operating temperature of the engine. Inaccurate information from this sensor will cause the PCM to make adjustments according to false operating conditions, which could lead to reduced fuel economy and engine cooling system failure.

You can read our advanced technical discussion about the ECT sensor to find more information that can help you troubleshoot P0116, especially if you’re planning to attempt a DIY fix.

Note: The definition of code P0116 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0116 Code?

• Malfunctioning Engine Coolant Temperature Sensor
• Faulty or corroded ECT wiring or connections
• Engine overheating
• Engine temperature below specification
• An issue with the PCM, such as software in need of an update

What are the Common Symptoms of the P0116 Code?

• Check Engine Light will illuminate
• In many cases, this trouble code may not present unusual symptoms
• In some cases, this code may reduce engine performance (hard starting and/or poor fuel economy)
• Engine overheating

How to Diagnose the P0116 Code

Identifying the underlying cause of the P0116 code can be difficult, especially if you’re not confident with your automotive knowledge. In most cases, it would be best to bring your vehicle to an auto repair shop and seek the help of a professional for an accurate diagnosis.

Here are some videos that can help give you an idea about how this trouble code may be diagnosed:

How to Fix the P0116 Code

The P0116 code is a generic trouble code that may apply to various makes and models. While vehicles from different manufacturers may share common symptoms, the steps for diagnosis and repair for a P0116 Ford code may differ from a P0116 Hyundai code.

If you’re an advanced DIYer who’d like to fix this code on your own, it will be helpful to refer to repair manualsor get factory vehicle repair information from an online subscription service.

Where to Get Quality Parts to Fix DTC P0116

While DTC P0116 might not have any symptoms outside of an illuminated check engine light, you should still ask a mechanic to take a look. The code’s underlying issues might eventually lead to your engine overheating, and that might get you stranded somewhere at the worst possible time. Thankfully, whether you need wiring or sensors, CarParts.com has your back.

The large CarParts.com catalog contains many different aftermarket parts to suit your various needs. If you want to narrow these parts down, our website is very easy to navigate. Just use our built-in vehicle selector to view parts that are guaranteed to fit your vehicle perfectly. It only takes a few quick clicks. If you’re still not sure what to do or where to start, our friendly customer support team is always ready to help. They’re always happy to answer any questions you might have.

Get the parts you need to resolve DTC P0116 fast and easy. Buy a replacement coolant temperature sensor or other repair parts now here at CarParts.com.

Products Mentioned in this Guide

Coolant Temperature Sensor Cylinder Head Engine Control Module