Transmission Fluid Temperature High
Transmission fluid temperature is higher than normal operating range.
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What it means (plain English)
The transmission fluid is getting too hot, which can lead to damage and shifting issues.
What the computer is actually seeing
The computer monitors the transmission fluid temperature using a sensor. It sends a signal that represents the temperature, usually between 60°C to 90°C (140°F to 194°F) during normal operation.
What a healthy reading looks like
Transmission fluid should stay below 100°C (212°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 the transmission fluid level. Add fluid if low. Decision: If fluid is low, fill it and retest. If not low, continue.
- 22. Visually inspect the transmission fluid temperature sensor and connector for damage. Decision: If damaged, replace the sensor. If not, continue.
- 33. Test the resistance of the transmission fluid temperature sensor. Expected resistance at 25°C (77°F) is approximately 2,000 to 3,000 ohms. Decision: If resistance is out of spec, replace the sensor. If in spec, continue.
- 44. Check for any transmission leaks that could indicate a problem. Decision: If leaks are found, repair them and retest. If no leaks are detected, continue.
- 55. Inspect the transmission cooler for blockages or damage. Decision: Clean or replace cooler if issues are found. If cooler is good, consider evaluating the transmission for overloading issues.
Common causes
- Low transmission fluid level
- Faulty transmission fluid temperature sensor
- Clogged transmission cooler
- Excessive load on the transmission
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive short distances but fix it soon to avoid transmission damage.
Will this code come back after resetting?
If the underlying issue isn't fixed, yes, it will come back.
Why is this code paired with others like SPN 735?
They often indicate related transmission or cooling issues.
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