Transmission Fluid Temperature Sensor
Transmission fluid temperature is too high.
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What it means (plain English)
The sensor that measures how hot the transmission fluid is reading a temperature that's higher than expected, indicating possible overheating issues.
What the computer is actually seeing
The ECM receives an input voltage from the transmission fluid temperature sensor (often around 0.5V to 4.5V), which corresponds to fluid temperatures typically ranging from 0°C (32°F) to 150°C (302°F). If the temperature exceeds the normal range for an extended period, the code sets—indicating possible overheating.
What a healthy reading looks like
Transmission fluid temperatures should be between 70°C (158°F) and 110°C (230°F) under normal operating conditions.
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. Make sure it's at the proper level; if low, fill and check for leaks.
- 22. Inspect the wiring and connector for the transmission fluid temperature sensor. Look for frayed wires, loose connections, or corrosion. Repair as necessary.
- 33. Test the resistance of the transmission fluid temperature sensor. At room temperature (around 20°C or 68°F), it should be approximately 2.2k ohms. Compare readings at different temperatures to ensure it’s within spec.
- 44. If the sensor tests OK, examine the transmission fluid condition. If it appears burnt or dirty, consider a fluid change.
- 55. If all prior checks are good, consider the possibility of an internal transmission issue affecting temperature, like a stuck valve in the valve body.
Common causes
- Faulty transmission fluid temperature sensor
- Low transmission fluid level
- Wiring issues (short, open, or corrosion)
- Dirty or burned transmission fluid
- Cooling system problems (e.g., failed radiator, cooler)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's generally drivable for a short distance, but high temperatures can damage the transmission. Address the issue soon.
Will this code come back after clearing it?
Yes, if the underlying issue isn't resolved, the code will typically reappear.
Why do I see this code with other codes?
It may be related to other issues in the transmission system, like pressure problems or fluid level issues.
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