Transmission Fluid Temperature Sensor High
Transmission fluid temperature is too high for normal operation.
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What it means (plain English)
The transmission has a sensor that measures how hot the transmission fluid is. If it gets too hot, it can cause damage and the sensor sends a signal to the computer to alert you.
What the computer is actually seeing
The transmission control module (TCM) reads the temperature sensor value. It should normally register between 175°F and 220°F (80°C - 105°C) during standard operation. A reading above 230°F (110°C) triggers this code.
What a healthy reading looks like
Normal transmission fluid temperature should be between 175°F and 220°F (80°C - 105°C). Anything over 230°F (110°C) is considered too high.
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. Ensure it's within the specified range and top off if low. Decision Point: Is the fluid level okay? If no, top it off and retest. If yes, proceed to step 2.
- 22. Inspect the wiring and connectors to the transmission fluid temperature sensor for damage or corrosion. Decision Point: Are the connections good? If no, repair or replace as necessary and retest. If yes, proceed to step 3.
- 33. Use a scan tool to monitor the transmission fluid temperature while the vehicle is running. Decision Point: Is the temperature reading consistent with normal operating range? If it's normal, the issue may be elsewhere. If it exceeds 230°F (110°C), proceed to step 4.
- 44. Check for external temperature influences like heavy towing or a stuck torque converter. Address these issues if present. Decision Point: Were any causes found? If yes, fix them and retest. If no, replace the transmission fluid temperature sensor.
Common causes
- Low transmission fluid level
- Faulty transmission fluid temperature sensor
- Wiring issues to the sensor
- Overheating due to heavy towing
- Radiator issues affecting fluid temperature
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
It's not recommended as high transmission fluid temperatures can cause serious damage.
Will this code come back after I fix the issue?
If the root cause is addressed, the code should not reappear.
Why does this code sometimes pair with a P0700 code?
P0700 is a generic transmission fault code indicating there’s a transmission issue, which could include high fluid temperature.
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