Transmission Fluid Temperature Sensor
The transmission fluid temperature sensor is reading out of range.
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What it means (plain English)
The sensor that measures how hot the transmission fluid is showing a temperature that the computer thinks is too high or too low. This can harm the transmission if not addressed.
What the computer is actually seeing
The ECM receives voltage signals from the transmission fluid temperature sensor that indicate the fluid temp; out-of-range readings trigger this code.
What a healthy reading looks like
Transmission fluid temperature should typically be between 150°F and 200°F (65°C to 93°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 transmission fluid level; it should be between the 'add' and 'full' marks. If low, top it off and recheck for the code. Decision: If no code, issue resolved.
- 22. Inspect the wiring and connectors at the transmission fluid temperature sensor for damage, corrosion, or loose connections. Repair or replace as needed. Decision: If problems found and fixed, recheck for the code.
- 33. Use a scan tool to monitor the transmission fluid temperature reading while the engine runs. Ensure it matches expected values (150°F to 200°F). Decision: If the sensor reading is out-of-range, replace the sensor.
- 44. If the sensor readings are normal, check for fluid contamination, which can affect temperature readings; flush the transmission if needed.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or shorts to the sensor
- Low transmission fluid level
- Contaminated transmission fluid
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to have it checked soon. If the fluid is overheating, it can damage the transmission.
Will this code come back after repairs?
If you fix the underlying issue, it shouldn't return unless there's another fault.
Why does it pair with SPN 880?
SPN 880 is also related to transmission temperature and usually appears if there's a common fault affecting the readings.
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