P0218
CriticalTransmission Fluid Over Temperature
Transmission System
What Does P0218 Mean?
Transmission fluid temperature is too high. Overheated transmission fluid breaks down and loses its lubricating properties.
Common Fix
Service transmission and add cooler if towing
Estimated Cost (DIY)
$50 - $300
Symptoms
- ⚠️Transmission slipping
- ⚠️Burnt fluid smell
- ⚠️Harsh shifting
- ⚠️Transmission warning light
Common Causes
Towing or heavy load in hot weatherlikely
Low transmission fluidlikely
Clogged transmission coolerpossible
Failing torque converterpossible
How to Diagnose P0218
- 1Stop towing and let transmission cool
- 2Check transmission fluid level and condition
- 3Inspect transmission cooler lines
- 4Check if auxiliary cooler is needed
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Frequently Asked Questions
- Can overheated transmission fluid damage the transmission?
- Yes — every 20°F above normal cuts fluid life in half. Severely overheated fluid breaks down and causes internal damage.
- How hot is too hot for transmission fluid?
- Most transmissions are designed for 175-200°F. Above 240°F, fluid begins to break down rapidly.