Description of the P0116 fault code.
OBD2 Error Codes

P0116 Malfunction in the coolant temperature sensor circuit

26.05.2022 /

P0116 – OBD-II Trouble Code Technical Description

Trouble code P0116 is a general trouble code that indicates that the engine control module (ECM) has detected that the coolant temperature sensor is outside the vehicle manufacturer's specified range or operating specifications. This usually occurs when the engine is started in a cold state and stopped when the engine is warm (until the next time the engine is started in a cold state).

What does the fault code mean P0116?

Trouble code P0116 indicates a problem with the coolant temperature sensor. This code indicates that the signal coming from the sensor is outside the acceptable range or performance specifications specified by the manufacturer.

Coolant temperature sensor

Possible reasons

Some of the possible causes of the P0116 trouble code are:

  1. Defective coolant temperature sensor.
  2. The wiring or connectors connecting the sensor to the ECU may be damaged or broken.
  3. Incorrect connection of the sensor or ECU.
  4. Low coolant level in the system.
  5. Malfunction in the power supply or ground circuit of the temperature sensor.
  6. Problems with the engine control module (ECU) itself.
  7. Incorrect installation or defects in the cooling system.

These are just some of the possible causes, and detailed examination and testing is necessary for an accurate diagnosis.

What are the symptoms of a fault code? P0116?

Some of the possible symptoms of a P0116 trouble code may include the following:

  • Engine starting problems: The car may have difficulty starting or may not start at all due to a malfunctioning coolant temperature sensor.
  • Unstable engine operation: If the coolant temperature is not read correctly, the engine may run rough, jerk, or even shut down.
  • Increased fuel consumption: If the engine does not properly signal coolant temperature, it can cause fuel and air to mix incorrectly, which will increase fuel consumption.
  • Incorrect operation of the cooling system: If the temperature sensor is faulty or gives incorrect signals, the cooling system may not function properly, which can cause the engine to overheat or become too cold.
  • An error appears on the instrument panel: Sometimes, if you have a P0116 code, the Check Engine light on your dashboard may come on.

These symptoms may occur to varying degrees and may depend on the specific conditions and type of vehicle.

How to diagnose a fault code P0116?

To diagnose DTC P0116, you can follow these steps:

  • Checking the connection of the coolant temperature sensor: Make sure the coolant temperature sensor connector is well connected and not damaged or corroded.
  • Checking the sensor resistance: Use a multimeter to measure the resistance of the coolant temperature sensor at normal engine temperature. Compare the measured value with the ratings listed in the repair manual for your specific vehicle.
  • Wiring check: Inspect the wiring and connectors leading from the coolant temperature sensor to the engine control module for damage, fractures, or corrosion. Check the integrity and reliability of connections.
  • Checking the engine control module: If all of the above checks do not reveal a problem, it may be necessary to check the engine control module itself for defects or malfunctions.
  • Additional tests: If necessary, additional tests may be performed, such as checking the power and ground circuits, and performing vehicle scans to identify other error codes or problems.

After diagnostics have been carried out and the cause of the malfunction has been identified, the necessary repairs or replacement of components can begin.

Diagnostic errors

When diagnosing DTC P0116, you should avoid the following errors:

  • Do not check surrounding components: Some technicians may focus only on the coolant temperature sensor itself, ignoring possible problems with the wiring, connectors, engine control module, or other components.
  • Do not carry out complex diagnostics: Sometimes technicians can jump to conclusions too quickly without performing a full diagnosis of the cooling system and engine management system. This may cause you to miss other problems that may be related to the P0116 trouble code.
  • Ignore operating conditions: It is necessary to take into account vehicle operating conditions, such as ambient temperature, engine load and driving speed, when diagnosing. Some problems may only appear under certain conditions.
  • Do not check information sources: The mistake may be not checking enough information from the repair manual or technical information from the vehicle manufacturer. This may lead to misunderstanding of normal coolant temperature sensor values ​​or other component specifications.
  • Do not test in a cold or warm state: It is important to carry out diagnostics both when the engine is cold and when the engine is warm, since problems with the coolant temperature sensor can manifest differently depending on the temperature.

How serious is the fault code? P0116?

Trouble code P0116 indicates a problem with the coolant temperature sensor. Although this is not a critical problem, it can result in poor engine performance, poor performance, and increased fuel consumption. If the problem is not resolved, it can lead to further engine damage and other serious problems. Therefore, it is necessary to take measures to correct this problem as soon as possible.

What repair will help eliminate the code? P0116?

The following steps are recommended to resolve DTC P0116:

  • Check the engine coolant temperature (ECT) sensor for damage, corrosion, or broken wiring. If damage is found, replace the sensor.
  • Check the wiring and connectors connecting the coolant temperature sensor to the engine control module (ECM). Make sure the wiring is intact and well connected.
  • Check the level and condition of the coolant in the cooling system. Make sure the cooling system is working properly and there are no leaks.
  • If the problem persists after checking the sensor and wiring, the engine control module (ECM) may be faulty. In this case, additional diagnostics and possibly ECM replacement are required.
  • After completing the repair, it is recommended to clear the fault code from the ECM memory using a diagnostic scanner.

If you encounter problems with diagnosis or repair, it is recommended that you contact a qualified auto mechanic or service center.

How to Fix P0116 Engine Code in 3 Minutes [2 DIY Methods / Only $7.31]

P0116 – Brand-specific information

Trouble code P0116 can be interpreted differently for different car brands, here are some examples:

When interpreting the P0116 trouble code for a specific vehicle make, it is always best to refer to the official documentation or service manuals provided by the manufacturer.

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