Redundant or Inaccurate Transmission Fluid Temperature
Transmission fluid temperature reading is out of range or inconsistent.
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What it means (plain English)
The computer is getting a faulty signal about how hot the transmission fluid is. It should be around 175-220°F (79-104°C) when operating normally, but it’s not getting a clear reading.
What the computer is actually seeing
The engine control module (ECM) or transmission control module (TCM) sees a temperature reading outside of the normal range (commonly below 120°F or above 260°F), or the voltage from the sensor is inconsistent—like fluctuating between 0.5V and 4.5V instead of staying stable.
What a healthy reading looks like
Transmission fluid temperature should be around 175-220°F (79-104°C) under normal operation, with sensor output voltage typically between 0.5V (cold) and 4.5V (hot).
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; it should be within safe limits.
- 22. Check the wiring and connectors going to the transmission fluid temperature sensor for damage or corrosion.
- 33. Test the voltage output of the transmission fluid temperature sensor; it should change smoothly as the fluid temperature changes.
- 44. If necessary, replace the temperature sensor and recheck values after clearing codes.
- 55. If the code returns, further diagnose the TCM or check for additional related codes.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or connector problems
- Low transmission fluid level
- Contaminated transmission fluid
- Faulty transmission control module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may drive okay for a while, but overheating can lead to serious transmission damage. Fix it soon.
Will this code come back after clearing it?
If the issue is not fixed, yes, the code will likely return. Monitor fluid levels and sensor operation.
Why does this code pair with others?
Common causes like wiring issues can affect multiple components, triggering related codes.
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