Technical Description of OBD-II Trouble Code
Condition of Engine Overtemp
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code that is applicable to vehicles equipped with OBD-II. Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
If this code is stored in the memory of your vehicle, it means that your vehicle is equipped with an engine overtemp indicator light. This light will illuminate if the engine overheats. Most modern vehicles also have a temperature gauge, but some do not.
An overheat condition in the cooling system is typically defined as a temperature above 240-250 deg. F (may vary depending on the manufacturer). The purpose of the overtemp light is to illuminate before any engine damage occurs. However, your first priority should be to shut down the engine as soon as possible.
Indications
The indications of a P0217 DTC may include:
Causes
Possible causes of a P0217 code include:
Possible Solutions
Start by checking the coolant level when the engine is cold. It is not advisable to check the coolant on a hot or overheated engine. Additionally, adding cold water to an overheated and empty cooling system can cause thermal shock, which is not recommended.
If you find that your cooling system is low on coolant and you have a stored P0217 code, inspect the system for leaks and repair them as necessary. Then, change the thermostat (see note below). After refilling the cooling system, restart the engine and verify that it is not overheating. Keep in mind that an overheated engine may expel coolant from the radiator cap to protect the cooling system from over-pressurization. If you cannot locate a leak, this may be the reason.
Follow the steps below to check the performance of the cooling system. If the coolant level is normal, check the radiator and A/C condenser for any restrictions that could impede airflow. This step may require removing the radiator and visually inspecting it outside of the vehicle. Check for restrictions or debris between the radiator and condenser. Ensure that all plastic panels that direct airflow into the radiator are in place. If you have access to a scan tool, check the cooling fans for operation or abnormal noise indicating a bearing failure. Look into the radiator tank (if possible) and observe its condition. Is there a significant buildup that may restrict coolant flow? If so, replace the radiator.
If you do not notice any apparent problems and the vehicle continues to overheat, feel the upper radiator hose. Is it hot, indicating that the coolant is flowing freely? If not, the water pump impeller may be damaged or broken, causing a no-flow condition. If the water pump appears to be working properly, the thermostat may be faulty. Replace it and re-check. If, after performing the above checks, you still experience problems with overheating and coolant being expelled from the system, there may be combustion gasses leaking into the cooling system. This would require a combustion gas leak-test on the cooling system. If you have a P0217 code but the vehicle is not overheating, there may be a faulty coolant temperature sender.
Note: An overheated engine can damage the thermostat. Therefore, it is always best to replace the thermostat after an overheat condition. Failure to do so may result in the repaired cause of the overheat, but the damaged thermostat may still cause an overheat condition.
