Transmission Fluid Temperature Sensor Out of Range
The transmission fluid temperature is outside expected limits.
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What it means (plain English)
The transmission fluid temperature sensor is reporting a temperature that's way too high or too low, which can cause the transmission to operate improperly.
What the computer is actually seeing
The PCM sees a voltage signal from the transmission fluid temperature sensor that doesn’t fall within the expected range, typically around 80°C (176°F) to 100°C (212°F) for normal operation.
What a healthy reading looks like
Normal transmission fluid temperature should be between 80°C (176°F) and 100°C (212°F).
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; should be within specified range and clean.
- 2Inspect wiring and connectors at the transmission fluid temperature sensor for damage or corrosion; repair as needed.
- 3Test the transmission fluid temperature sensor; resistance should change with temperature (typically 1-3 kΩ at 25°C/77°F).
- 4Verify PCM readings of fluid temperature against your multimeter or scan tool; they should match within a reasonable margin.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring or connector issues
- 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 moderate severity; you can drive, but limit heavy loads until fixed.
Will this code come back?
If the underlying issue isn't resolved, it’s likely to return.
Why might this code pair with SPN 1243?
SPN 1243 indicates an issue with the transmission’s performance, which could be linked to incorrect fluid temperature readings.
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