Transmission Oil Temperature Sensor
Transmission fluid temperature sensor range issue.
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What it means (plain English)
The transmission oil temperature sensor is measuring temperatures out of its normal range, which can lead to overheating or poor transmission performance.
What the computer is actually seeing
The computer sees readings from the transmission oil temperature sensor (typically 0-300°F). A voltage outside the expected range, usually 0.5-4.5V, indicates a fault.
What a healthy reading looks like
Transmission fluid temperature should be between 175°F to 225°F during normal operation; sensor voltage should be in the 0.5V to 4.5V 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.
- 1Check transmission fluid level and condition; top off if low or replace if burnt or dirty.
- 2Inspect wiring and connector for damage or corrosion; repair as necessary.
- 3Using a scan tool, check the voltage reading from the transmission oil temperature sensor; it should be between 0.5-4.5V under normal conditions.
- 4If the voltage is out of range, replace the sensor and retest. If in range, consider TCM issues.
Common causes
- Faulty transmission oil temperature sensor
- Wiring issues or connector corrosion
- Low transmission fluid level
- Faulty transmission control module (TCM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to address this code soon. Driving with an overheat risk can cause serious transmission damage.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why does this code pair with transmission performance issues?
The transmission temperature affects fluid viscosity and operation; high temps can cause slippage and shifting problems.
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