What does it mean?
This diagnostic code (DTC) is a generic powertrain code, meaning it applies to vehicles equipped with OBD-II. Although generic, specific repair steps may vary by make/model.
If you have a stored P0218 code, you have a transmission fluid temperature transmitter and likely a transmission overheat warning light on the instrument panel.
If your transmission/transaxle fluid temperature exceeds 290°F, P0218 will be set and the overheat warning light will illuminate. The primary cause of transmission failure is fluid overheating.
Symptoms
Symptoms of a P0218 DTC may include:
Vehicle transmission/transaxle not engaging
Fluid leaking from torque converter seal or other location
Low transmission/transaxle fluid level
Causes
Causes
Potential causes of a P0218 code include:
Overheating from towing an overloaded trailer
Restricted transmission cooler or lines
Restriction/debris in transmission cooler
Low transmission fluid
Inoperative cooling fan/fan clutch
Missing or damaged front air dam/deflector
Faulty transmission fluid temperature sensor
Possible Solutions
If towing a heavy load, ensure the vehicle is rated for that weight. If the load is too heavy, the transmission cooler may not maintain proper fluid temperature. An overheated transmission/transaxle won’t last long.
Next, verify the cooler isn’t obstructed by debris and lines aren’t pinched or leaking. If the transmission cooler has a cooling fan, ensure it operates correctly. If transmission fluid smells burnt or appears dark, perform a transmission fluid flush. If transmission fluid level is low, refill it and check for leaks.
Note: An overheated transmission can expel fluid through the vent or torque converter seal.