Incorrect Transmission Fluid Temperature
The transmission control module is reporting an inappropriate fluid temperature.
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What it means (plain English)
The computer thinks the transmission fluid is either too hot or too cold, which can lead to poor shifting or even damage.
What the computer is actually seeing
The Transmission Control Module (TCM) expects the fluid temperature to be between 70°F and 200°F during operation. If the temperature reading deviates from this range, an error is flagged.
What a healthy reading looks like
Normal transmission fluid temperature should range between 70°F (21°C) and 200°F (93°C).
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: Is the fluid level within specs?
- 22. Inspect the wiring and connectors for the transmission temperature sensor for damage or corrosion. Decision: Are the connections secure and undamaged?
- 33. Test the transmission fluid temperature sensor with a multimeter (should read in the range of 0.5V at 32°F to 4.5V at 200°F). Decision: Does the sensor output match expected values?
- 44. If the sensor is faulty, replace it. If wiring and fluid levels are good, consider fluid contamination or internal transmission issues.
- 55. Clear codes and test drive the vehicle to see if the code reappears. Decision: Does the fault code return?
Common causes
- Faulty transmission temperature sensor
- Wiring issues or bad connectors
- Low transmission fluid level
- Contaminated transmission fluid
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's usually safe for short distances but should be addressed soon to prevent transmission damage.
Will this fault code come back?
It can return if the underlying issues are not resolved—like a bad sensor or low fluid.
What happens if I ignore this code?
Ignoring it can cause more serious transmission issues, including overheating or complete failure.
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