Technical Description of OBD-II Trouble Code
Condition of Transmission Over Temperature
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code, which means it is applicable to OBD-II equipped vehicles. Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
If you have a stored P0218 code, it indicates that you have a transmission fluid temperature sender and likely a transmission over-temp light in the instrument cluster.
If the temperature of your transmission/transaxle fluid exceeds 290 deg. F, the P0218 code will be triggered and the overtemp light will illuminate. Overheated fluid is the primary cause of transmission failure.
Symptoms
The symptoms of a P0218 DTC may include:
Causes
Possible causes of a P0218 code include:
Possible Solutions
If you are towing a heavy load, ensure that your vehicle is rated for that load. If the load is too heavy, the transmission cooler may not be able to adequately cool the transmission fluid, leading to overheating. An overheated transmission/transaxle will not last long.
Next, check for any debris that may be restricting the cooler and ensure that the lines are not pinched or leaking. If the transmission cooler is equipped with a cooling fan, verify that it is functioning properly. If the transmission fluid has a burnt smell or appears dark in color, perform a transmission fluid flush. If the transmission fluid level is low, top it off and inspect for any leaks.
Note: An overheated transmission can expel fluid from the vent or the torque converter seal.
