Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P0218 OBD-II Trouble Code: Transmission Over Temperature

P0218 OBD-II Trouble Code: Transmission Over Temperature

Check Engine Light

P0218 trouble code definition

Transmission over temperature condition

What the P0218 code means

The P0218 code means that the transmission temperature has exceeded the maximum allowable limit that has been set by the vehicle’s manufacturer.

What are the causes of the P0218 code?

  • A leak from any part of the transmission system such as the transmission pan, transmission cooler lines, transmission cooler, or the radiator.

  • Internal damage to the transmission causing excess friction between internal moving transmission parts.

  • A faulty transmission temperature sensor

  • A faulty powertrain control module

  • It is even possible that the engine being overheated could cause the transmission to overheat as well.

Note: Vehicles will either have a transmission cooler or radiator but usually not both.

What are the symptoms of the P0218 code?

Symptoms of the P0218 code may include an improperly operating transmission in ways such as slipping, hard shifts, or total lack of response all together.

Some vehicles have a fail-safe mode built into their transmissions to assist the driver in getting to a safe place to pull over before shutting off the vehicle. If the vehicle in question has a fail-safe system integrated, this feature may be engaged as an additional symptom.

How does a mechanic diagnose the P0218 code?

A mechanic would start diagnosing the P0218 code by checking the transmission fluid level and condition. If the transmission fluid is low or smells burnt, the transmission may have some internal damage.

Next, the mechanic would inspect the transmission and its cooling system for any leaks of transmission fluid. If a leak is found during this inspection, this may be another cause of the overheating issue. Any leak that is found should be repaired and the transmission should be topped off before any further diagnosis takes place. If the fluid level is low, the transmission fluid that is left will start to burn so just because it smells burned does not guarantee that the transmission has internal damage. If no leaks were found but fluid smells burnt, this would be a good reason to suspect the transmission may have internal damage.

If neither of these conditions are found, the mechanic would then test the transmission temperature sensor for proper function and if it were faulty it would then be replaced. If the transmission temperature sensor proves to be functional, the issue may lie within the powertrain control module.

Common mistakes when diagnosing the P0218 code

  • A common mistake that could be made when diagnosing the P0218 code would be finding one problem and stopping the diagnosis at that point.

  • A leaking transmission is one problem, but this problem may have caused the fluid level to go low and therefore may have internal transmission damage.

  • It is important to inspect all aspects of a problem before calling the repair complete.

    • It is possible that a transmission fluid leak could be repaired and the same P0218 code could come back.

How serious is the P0218 code?

A P0218 code would be considered very serious as it relates to one of the most expensive parts of an automobile. A transmission replacement for most vehicles could cost thousands of dollars. It is very important to have this issue diagnosed and repaired immediately in order to save the transmission from major damage.

What repairs can fix the P0218 code?

  • Repairing a transmission fluid leak by replacing parts such as the radiator, transmission cooler, transmission cooler lines, or transmission pan gasket.
  • Replacing the transmission temperature sensor
  • Replacing the powertrain control module
  • Rebuilding or replacing the entire transmission
  • Repairing an engine overheating condition

Additional comments regarding the P0218 code?

In order to help avoid getting a P0218 code, it is always a good idea to check your transmission fluid at least at every oil change. It is also important to have the transmission fluid and filter (if applicable) replaced at regular intervals to keep the transmission in good working order.

Need help with a P0218 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...
P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector –...

Related questions

Q: need to know how to change a coolant bypass solenoid and where it is located. Can't find anything on the internet about this.

Just search for "Ford Escape 2013 coolant by-pass solenoid". The coolant by-solenoid is generally located on top of the engine. After you make that search you'll get a good point of view. The repair involves removing coolant from the engine....

Q: Check Engine Light is on, trouble codes P0001 and P0006 are showing.

The fuel shut off valve is a solenoid that is controlled primarily by the shut off relay. The message you are receiving is telling you the circuit has low voltage. This means the solenoid is not energizing the way it...

Q: Engine light and battery light is on.

Hi there. Check the alternator and see if its not charging properly. Charge up the battery and start the engine. Check for a voltage on the battery with the engine running and see if its between 13.5 and 14.7 volts....