FMI 7 - Transmission Fluid Temperature Sensor Out of Range
The transmission fluid temperature sensor is reading a value that is outside the expected range.
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What it means (plain English)
The sensor that measures the temperature of the transmission fluid is either too high or too low, which can lead to improper transmission operation.
What the computer is actually seeing
The engine control module (ECM) sees a transmission fluid temperature reading that is either below 14°F (-10°C) or above 248°F (120°C).
What a healthy reading looks like
Transmission fluid temp should typically be between 160°F and 200°F (71°C - 93°C) during normal operation.
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 transmission fluid level and condition. Ensure it's within spec and clean. Low or dirty fluid can impact readings. Decision: Is fluid okay? If no, top off or replace and recheck.
- 22. Check the wiring and connector to the transmission fluid temperature sensor for any damage or corrosion. Decision: Is the wiring intact? If no, repair or replace as needed.
- 33. Using a scanner, check the actual transmission fluid temperature reading. Compare it with the coolant/engine temp. Decision: Is the temp reading within the expected ranges? If no, replace the sensor.
- 44. If the sensor was replaced and the problem persists, look for possible shorts or opens in the wiring harness leading to the ECM.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or damaged connectors
- Low or contaminated transmission fluid
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive but avoid heavy towing or aggressive driving until resolved.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return after a short while.
Why does this code pair with SPN 1230?
SPN 1230 often indicates the same sensor issue, further confirming a problem with the temperature sensor.
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