Transmission Oil Temperature Sensor 1
Wrong transmission oil temperature reading from sensor 1.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The transmission oil temperature sensor measures how hot the transmission fluid is; if it's faulty, it can cause bad shifting and overheating.
What the computer is actually seeing
The sensor should output a voltage reading between 0.5V to 4.5V based on the fluid temperature, which typically ranges from 0°C (32°F) to 100°C (212°F).
What a healthy reading looks like
0.5V at 0°C, 2.5V at 50°C, 4.5V at 100°C.
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 connector at the transmission oil temperature sensor for damage or corrosion. If found, repair or replace.
- 22. Measure the voltage at the sensor connector keying the ignition on. It should be within expected values; if not, check the wiring back to the ECM.
- 33. If voltage is steady, disconnect the sensor and confirm resistance varies with temperature; if no change, replace the sensor.
- 44. If all checks are okay and fault persists, inspect transmission fluid level and condition; low or contaminated fluid can cause erratic readings.
Common causes
- Faulty transmission oil temperature sensor
- Wiring issues (shorts or breaks)
- Connector problems (corrosion, loose connection)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive but should fix it soon to prevent transmission overheating.
Will this issue come back after clearing the code?
If the sensor or wiring is faulty, the code will likely return.
Why does this code sometimes appear with others?
It's common for related sensors to fail together or due to a common wiring issue.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →