Transmission Fluid Temperature Too High
Transmission fluid temperature exceeds normal operating range.
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What it means (plain English)
The transmission fluid is getting too hot, which can lead to shifting problems and transmission damage.
What the computer is actually seeing
The ECU monitors the transmission fluid temperature using a sensor. If this temperature rises above a set threshold (usually around 200°F or 93°C for many transmissions), it triggers this fault code.
What a healthy reading looks like
Normal transmission fluid temperature is typically between 160°F and 200°F (71°C to 93°C). Over 200°F (93°C) triggers a fault.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the transmission fluid level. Add fluid if low (should be in the 'full' range on the dipstick).
- 22. Inspect the transmission fluid condition (should be clean and reddish, not brown or burnt).
- 33. Test the transmission fluid temperature sensor with a multimeter. Expected output at normal temp should be around 0.5V to 1V if the temp is below 200°F; replace if faulty.
- 44. Check for any signs of blockage in the transmission cooler or lines. Ensure coolant flow is proper through the system.
- 55. If all checks pass, consider possible internal transmission issues, like a worn valve body or clutches.
Common causes
- Low transmission fluid level
- Faulty transmission fluid temperature sensor
- Cooling system issue (radiator or cooler blockage)
- Worn transmission components
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to avoid driving until you fix this issue as it can lead to transmission failure.
Will this code come back after clearing?
If the underlying problem isn't fixed, yes, this code will likely return.
Why does it pair with other codes?
Often, when transmission temperature is high, it affects multiple sensors or systems, causing related codes to trigger.
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