Transmission Fluid Temperature Out of Range
Indicates the temperature of the transmission fluid is outside the normal range.
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What it means (plain English)
The computer checks the transmission fluid temperature to make sure it's within a safe level for operation. If it gets too hot, it risks damaging the transmission. The fluid should ideally be around 160°F to 220°F during regular operation. When it’s too low or too high, the code is triggered.
What the computer is actually seeing
The computer monitors the transmission fluid temperature sensor reading and compares it to expected values. If the reading is below 140°F (too cold) or above 240°F (too hot), the code will set.
What a healthy reading looks like
Normal transmission fluid temperature should be between 160°F and 220°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.
- 11. Check the transmission fluid level; it should be between the 'full' and 'add' marks on the dipstick.
- 22. Inspect the wiring and connectors related to the transmission fluid temperature sensor for damage or corrosion.
- 33. Use a scan tool to read the transmission fluid temperature; verify it matches expected values.
- 44. If the fluid temperature reading is within normal limits, replace the transmission fluid temperature sensor and retest.
- 55. If the sensor reading is still out of range, check for any additional codes indicating TCM issues.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or poor connections
- Low transmission fluid levels
- 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 issue soon; driving with abnormal fluid temperatures can cause long-term transmission damage.
Will this code come back after repairs?
If the underlying issue is fixed properly, it shouldn't return unless there’s a new problem.
Why does this code sometimes appear with SPN 1231?
SPN 1231 relates to fluid temperature sensor faults; if the sensor is failing, both codes can be triggered.
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