Transmission Oil Temperature Sensor
Indicates an issue with the transmission oil temperature sensor.
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 has a temperature sensor that reports how hot the transmission fluid is. If this sensor has a problem, the computer may not know if the fluid is too hot, which can lead to transmission damage.
What the computer is actually seeing
The computer monitors the transmission fluid temperature through the sensor, typically expecting a voltage range of 0.5 to 4.5 volts corresponding to temperatures of -40°C to +125°C (-40°F to +257°F).
What a healthy reading looks like
0.5 volts = -40°C, 2.5 volts = 45°C, 4.5 volts = 125°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. Inspect the wiring and connectors for the transmission oil temperature sensor. Look for frayed wires or corrosion.
- 22. Check the transmission fluid level and quality. It should be a clear red color; if it's brown or smells burnt, replace it.
- 33. With the vehicle running, use a scan tool to read the transmission oil temperature. Compare the reading with the expected values above.
- 44. If the temperature reading is out of spec, replace the transmission oil temperature sensor and retest.
Common causes
- Faulty transmission oil temperature sensor
- Wiring issues or corroded connectors
- Low transmission fluid level or quality
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately severe; you can drive but monitor performance and have it checked soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, it likely will return.
Why do I see this code with others like SPN 1919?
Those codes often appear together due to common wiring issues or shared sensor failures.
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