Transmission Fluid Temperature Sensor A Circuit Intermittent
Intermittent signal from the transmission fluid temperature sensor.
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What it means (plain English)
The transmission fluid temperature sensor reports the fluid temperature to the engine control module. If the signal drops out intermittently, it can lead to incorrect shifting and overheating.
What the computer is actually seeing
The engine control module expects a voltage between 0.5V (cold) and 2.5V (hot) from the sensor. An intermittent low or high signal will trigger this code.
What a healthy reading looks like
Expected voltage range is 0.5V to 2.5V, depending on the transmission fluid temperature (approx. 180°F at 2.5V and 70°F at 0.5V).
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 wiring and connectors for damage or corrosion. Repair as necessary. Decision: Is the wiring intact? If yes, proceed to step 2; if no, fix now.
- 22. Test the transmission fluid temperature sensor using a multimeter. Expected reading should be within 0.5V to 2.5V based on fluid temperature. Decision: Is the sensor within spec? If yes, proceed to step 3; if no, replace the sensor.
- 33. Clear the code and test drive the vehicle. Monitor the transmission fluid temperature with a scanner. Decision: Does the fault return? If yes, consider an ECM issue; if no, repair is complete.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues (frayed or broken wires)
- Poor connector contact (corrosion or dirt)
- ECM software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but be aware of potential transmission overheating and poor shifting.
Will this code come back after clearing?
It may if the underlying issue isn't fixed.
Why does this code appear with shifting problems?
The transmission relies on accurate temperature readings for proper operation; incorrect readings can cause erratic shifting.
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