P0217 Fault Code

P0217 OBD-II Trouble Code Short Description

Engine Overtemp Condition

What does trouble code P0217 mean?

The P0217 fault code on cars refers to a problem with the engine coolant temperature sensor circuit. This can cause the engine to run too hot or too cold, which can lead to a variety of problems including reduced fuel efficiency, poor performance, or even engine damage.

The solution to the P0217 fault code will depend on the exact cause of the problem. In many cases, it may simply be a faulty sensor or a wiring issue that needs to be fixed. In other cases, the problem may be more serious and require more significant repairs.

It is important to address any fault codes in a timely manner as they can impact the overall health and performance of the vehicle. If left unresolved, the problem could escalate and lead to more extensive and costly repairs in the future.


What are the symptoms of the P0217 code?

  • Low engine coolant level
  • Faulty thermostat
  • Malfunctioning engine coolant temperature (ECT) sensor
  • Defective engine control module (ECM)


What causes the P0217 code?

The P0217 fault code pertains to the engine coolant temperature (ECT) sensor circuit, which is responsible for monitoring the temperature of the engine coolant. This code indicates that the engine control module (ECM) has detected an incorrect or abnormal signal from the ECT sensor circuit. The common causes of the P0217 code include:

  1. Faulty ECT sensor: A defective or malfunctioning ECT sensor may send incorrect signals to the ECM, causing it to trigger the P0217 code.

  2. Faulty wiring or connections: Damaged wiring, loose harness connections, or corroded electrical connectors can cause poor connections and disrupt the signal transmission between the ECT sensor and the ECM.

  3. Failed thermostat: A faulty thermostat that is stuck open or closed can prevent the engine from reaching the proper operating temperature, resulting in an abnormal ECT signal.

  4. Failed ECM: In rare cases, a failed ECM may misinterpret the ECT signal and lead to the P0217 code.

  5. Other engine issues: Several engine-related issues, such as a blocked or leaking radiator, a malfunctioning water pump, or a blown head gasket, can also trigger the P0217 code.

If the P0217 code is triggered, the Check Engine Light will illuminate, and the vehicle may experience reduced engine performance, poorer fuel economy, and increased emissions. It is recommended to have the vehicle diagnosed and repaired by a qualified mechanic to prevent further damage or safety issues.

Possible Solutions

How to fix P0217?

If your car has a P0217 fault code, which indicates a problem with the engine coolant temperature sensor circuit, here are a few steps you can take to fix the issue:

  1. Check the coolant level: Low coolant level can lead to incorrect temperature readings. Ensure that the coolant is at the appropriate level.

  2. Inspect the wiring: Look for damaged or broken wires, loose connections, and corrosion in the coolant temperature sensor wiring. Repair or replace any damaged parts.

  3. Examine the coolant temperature sensor: Check the coolant temperature sensor for damage or signs of wear. Replace the sensor if necessary.

  4. Check the thermostat: A faulty thermostat can cause P0217 fault codes. Inspect the thermostat and replace it if required.

  5. Scan and clear codes: After making the necessary repairs, scan your car's diagnostic system to see if the check engine light and the P0217 fault code have been cleared.

By following these steps, you can resolve the P0217 fault code on your car and ensure that your engine is running smoothly.


  • What is P0217 code?

    P0217 is a diagnostic trouble code (DTC) that indicates a malfunction in the engine coolant over-temperature protection system.

  • What causes a P0217 code?

    A P0217 code is usually caused by a malfunctioning engine coolant temperature sensor, faulty thermostat, a clogged radiator, or a faulty engine control module (ECM).

  • What are the symptoms of a P0217 code?

    The symptoms of a P0217 code may include engine overheating, reduced engine performance, and in severe cases, engine damage.

  • How is a P0217 code diagnosed?

    A P0217 code is diagnosed using an OBD-II scanner, which reads the code stored in the ECM and provides information about the cause of the malfunction.

  • How is a P0217 code fixed?

    To fix a P0217 code, the underlying cause of the malfunction needs to be identified and addressed. This may involve replacing the engine control module, replacing the engine coolant temperature sensor, or servicing the cooling system.

  • Can a P0217 code be ignored?

    A P0217 code should not be ignored as it may lead to engine overheating and damage if left unrepaired.

  • How much does it cost to fix a P0217 code?

    The cost of fixing a P0217 code varies depending on the underlying cause of the malfunction and the extent of the repair required. It may range from a few hundred dollars to several thousand dollars.

  • Is a P0217 code covered under warranty?

    If the vehicle is still under warranty, a P0217 code may be covered. However, the specific terms of the warranty should be reviewed to determine whether the repair is covered.