Transmission Fluid Temperature Sensor Fault
Indicates a fault with the transmission fluid temperature sensor.
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What it means (plain English)
The computer is not getting a proper signal from the transmission fluid temperature sensor, which measures how hot the transmission fluid gets.
What the computer is actually seeing
The Engine Control Module (ECM) expects a voltage between 0.5V and 4.5V according to the fluid temperature changes. If the voltage stays steady or goes outside this range, it triggers the fault.
What a healthy reading looks like
Transmission fluid temperature should be between 165°F and 220°F; corresponding sensor voltage should be 1V to 4V at these temps.
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.
- 1Check the transmission fluid level; it should be between the MIN and MAX marks on the dipstick.
- 2Inspect wiring and connectors to the transmission fluid temperature sensor for damage or corrosion. Repair as needed.
- 3Use a multimeter to check voltage at the sensor; it should be between 1V and 4V. If not, replace the sensor.
- 4If the sensor checks out, use a scan tool to look for ECM software updates that may fix calibration issues.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or damaged connectors
- Low transmission fluid level
- ECM software issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's best to fix this soon as overheating transmission can lead to serious damage.
Will this fault code come back after clearing?
Yes, if the underlying issue isn't fixed, it will return.
Why is this code paired with fluid level issues?
Low fluid affects temperature readings, causing false signals to the ECM.
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