Transmission Fluid Temperature High
Transmission fluid temperature is higher than normal limits.
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What it means (plain English)
The transmission fluid is getting too hot, which can cause shifting problems and damage if not addressed.
What the computer is actually seeing
The engine control module (ECM) monitors the transmission fluid temperature sensor and expects temperatures to stay within a specified range, typically around 70-90°C (158-194°F) during normal operation.
What a healthy reading looks like
Transmission fluid temperature should be between 70-90°C (158-194°F).
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 transmission fluid level. Should be at the correct mark on the dipstick under normal conditions.
- 22. Inspect the wiring and connectors to the transmission fluid temperature sensor for damage or corrosion.
- 33. Use a scan tool to check the actual transmission fluid temperature. It should read between 70-90°C (158-194°F). If it's over, continue testing.
- 44. Verify the operation of the transmission cooler. Ensure no blockages exist and that airflow is unobstructed.
- 55. If all previous checks are normal but the code persists, consider replacing the transmission fluid temperature sensor.
Common causes
- Failed transmission fluid temperature sensor
- Low transmission fluid level
- Clogged transmission cooler
- Poor airflow around the transmission
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to avoid driving until the issue is resolved to prevent transmission damage.
Will this code clear itself?
It won't clear until the fault is fixed, and it may come back if the cause isn't addressed.
Why did this code appear after towing?
Towing can increase transmission fluid temperatures due to extra load, especially if fluid levels are low or cooling is inadequate.
Working a real vehicle right now?
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