P0218Generic code

P0218 Code: Transmission Over Temperature Condition

The P0218 code means the fluid in the automatic transmission reached an excessive temperature. Reduce the load and check the fluid and the transmission cooler. You can drive with caution, and repairs cost about $0 to $800.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$0 to $800
Difficulty
Medium
System
Transmission
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0218 code means

The transmission computer watches the fluid temperature with the TFT sensor. Above the limit (often 130 to 150 °C, or about 266 to 302 °F), it stores the P0218 code and may change the shift strategy to protect the transmission.

Overheated fluid breaks down and speeds up wear on the clutches and seals.

The transmission fluid temperature goes up mostly when the torque converter slips: when towing, climbing long hills with a load, or driving in heavy traffic in hot weather. Every 10 °C (18 °F) above about 90 °C (194 °F) cuts the life of the fluid significantly. That is why, on vehicles that tow, many manufacturers recommend an extra cooler and more frequent fluid changes.

P0218 code symptoms

  • Harsh shifts or limp mode.
  • Smell of burnt fluid.
  • Transmission temperature warning light.

Likely causes of the P0218 code

  1. Towing or an excessive load.
  2. Low fluid level or degraded fluid.
  3. Clogged transmission cooler.
  4. Slipping torque converter.
  5. Faulty TFT sensor.

How to diagnose the P0218 code step by step

  1. Check the fluid level and condition.
  2. Inspect the cooler and its hoses.
  3. Compare the TFT reading with the real temperature.
  4. Check the torque converter lockup.
  5. Log the temperature on the road. If it only goes up under load, the cooler is not big enough. If it always goes up, check the torque converter and the fluid level.

How to fix the P0218 code

  • Reduce the load and let the transmission cool down.
  • Change the fluid if it is degraded.
  • Clean or replace the cooler.
  • Add an auxiliary cooler if you tow often.
  • Use tow/haul mode if the vehicle has it.

Technical reference data

  • Normal fluid temperature: 70 to 95 °C (about 158 to 203 °F).
  • Typical limit for the code: 130 to 150 °C (about 266 to 302 °F).
  • These values are a rough guide, so check the manufacturer's data for your engine.

Brand-specific notes

The P0218 code is frequent on pickup trucks that tow. The notes below are what is reported for these brands.

P0218 on Ford

Frequent on Ford trucks that tow.

P0218 on GM

Frequent on GM trucks that tow.

P0218 on Ram

Frequent on Ram trucks that tow.

Frequently asked questions about P0218

Can I drive with a P0218 code?
With caution, and without a load until the temperature comes down.
What causes the P0218 code?
Mostly towing, low fluid or a clogged cooler.
Can it damage the transmission?
Yes, if it keeps happening. Burnt fluid wears out the clutches.
How much does it cost to fix P0218?
Roughly $0 to $800 if it is just the fluid or the cooler. Anything beyond that means the transmission has been damaged.
What is the most common cause of P0218?
Towing or hauling a heavy load, followed by low or degraded fluid and a clogged cooler. Start by checking the fluid level and condition.
Will a P0218 code clear itself?
Often the light goes out after the transmission cools down, but if the cause is still there, such as low fluid or a clogged cooler, it will come back.

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