Transmission Fluid Temperature Sensor Circuit High
The transmission fluid temperature sensor signal is too high.
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What it means (plain English)
The transmission fluid temperature sensor measures how hot the transmission fluid is, and you’re seeing a signal that suggests it’s too high, which might mean the fluid is overheating or the sensor is failing.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage signal from the transmission fluid temperature sensor in the range of 0.5V to 4.5V, corresponding to fluid temperatures from -40°C to +150°C. If the voltage exceeds 4.5V, it triggers this fault code.
What a healthy reading looks like
0.5V to 4.5V indicates normal operation; above 4.5V is considered high and triggers the code.
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 transmission fluid level and condition: Ensure fluid is at the correct level and not burnt. If fluid is low or burnt, top off or replace accordingly. If fluid is good, move to step 2.
- 22. Inspect sensor wiring and connectors: Look for corrosion, loose connections, or frayed wires. Repair or replace as needed. If wiring is good, proceed to step 3.
- 33. Test the transmission fluid temperature sensor: Use a multimeter to measure voltage at the sensor connector while running the engine. You should see a signal between 0.5V and 4.5V. If it exceeds 4.5V, replace the sensor. If normal, check the ECM. Run a code scan after each step to see if the code returns.
Common causes
- Faulty transmission fluid temperature sensor
- Short in sensor wiring
- Poor connector contact
- Transmission overheating
- Oil cooler failure
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s not recommended to drive for an extended period, as overheating can damage the transmission.
How likely is it that the code will come back after clearing it?
If the underlying issue isn’t fixed, the code will likely return.
Why does this code sometimes pair with transmission performance issues?
This code indicates high temperature; if the transmission overheats, it can cause slippage or shifting issues.
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