Transmission Fluid Temperature Sensor
Indicates a problem with the transmission fluid temperature sensor circuit.
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What it means (plain English)
The transmission fluid temperature sensor monitors the temp of the transmission fluid to prevent overheating. If it detects temperatures outside of normal range, it sends a voltage signal to the computer, which can cause shifting issues or poor performance.
What the computer is actually seeing
The computer expects a voltage signal that correlates with fluid temperatures, typically between 20°C (68°F) and 100°C (212°F), translating to a voltage range of 0.5V to 4.5V.
What a healthy reading looks like
0.5V to 4.5V at fluid temperatures between 20°C (68°F) and 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 and condition. Correct if low or contaminated.
- 22. Inspect the wiring and connectors for the transmission fluid temperature sensor for damage or corrosion. Repair as needed.
- 33. Use a scan tool to monitor the actual temperature reading and compare it to the expected values as you warm up the vehicle.
- 44. If readings are stable but outside the normal range, replace the transmission fluid temperature sensor and retest.
- 55. If issues persist, check the vehicle's control module for faults or update software.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or short circuits in the sensor circuit
- Poor connector contacts leading to intermittent signal
- Low or contaminated transmission fluid
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's not recommended to drive, as it may cause shifting issues and further transmission damage.
Will this code come back after being cleared?
Yes, if the underlying issue isn't fixed, the code will likely return.
Why does this code pair with other transmission-related codes?
Other codes often relate to the same system components, which can affect or indicate the same issues.
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