Transmission Temperature Sensor
Indicates a fault with the transmission temperature sensor.
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What it means (plain English)
The transmission temperature sensor measures the fluid temperature; if it gets too hot or cold, it can cause transmission damage.
What the computer is actually seeing
The ECM sees a voltage signal from the transmission temperature sensor that varies based on fluid temperature, typically between 0.5V (low temp) to 4.5V (high temp).
What a healthy reading looks like
Normal transmission fluid temperature is between 70°C to 90°C (158°F to 194°F). The sensor should output 0.5V to 4.5V across this range.
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 necessary, then recheck code. Decision: If code clears, issue was low fluid; if not, proceed.
- 22. Inspect the wiring and connectors to the transmission temperature sensor for damage or corrosion. Decision: Repair any issues found; if no issues, continue.
- 33. Measure the voltage output from the transmission temperature sensor with a multimeter while checking fluid temperature. Expected should be between 0.5V (low temp) and 4.5V (high temp). Decision: If voltage is outside this range, sensor is likely faulty; if normal, check ECM.
- 44. Replace the transmission temperature sensor and clear the codes. Recheck for reappearance. Decision: If code reappears, suspect a faulty ECM or TCM.
Common causes
- Faulty transmission temperature sensor
- Wiring issues (frayed or shorted wires)
- Bad ECM or poor connection at the ECM
- Low transmission fluid level or quality
- Faulty transmission control module (TCM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate; you should fix it soon to avoid potential transmission overheating.
Will this code come back after I fix it?
If the underlying issue is addressed, it shouldn't reappear.
Why does this code appear with other codes?
These codes often indicate related issues in the transmission system.
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