Transmission Fluid Temperature Sensor 1
Transmission fluid temperature sensor is reading out of expected range.
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What it means (plain English)
The transmission fluid temperature sensor monitors the temperature of the transmission fluid. If the temperature is too high or too low, it can signal a problem, affecting shifting and overall transmission performance.
What the computer is actually seeing
The Engine Control Module (ECM) reads the temperature from the transmission fluid temperature sensor. If the sensor sends a voltage signal that indicates a temperature outside the range of -40°F to 300°F, the code will trigger.
What a healthy reading looks like
Transmission fluid temperature should be between 160°F to 230°F during normal operation under load.
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 wiring and connectors for damage or corrosion at the transmission fluid temperature sensor. Repair as necessary. Decision: Is the wiring intact? Yes - go to step 2. No - repair and retest.
- 22. Inspect the transmission fluid level. It should be between the low and high marks on the dipstick. Decision: Is the fluid at the correct level? Yes - go to step 3. No - top off the fluid and retest.
- 33. Verify the operation of the transmission fluid temperature sensor using a scan tool. Confirm the temperature reading during operation. Decision: Is the temperature reading within expected values? Yes - code might be intermittent; monitor. No - replace the transmitter.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or damaged connectors
- Low transmission fluid level
- Contaminated transmission fluid
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's moderate in severity; you can drive but should fix soon to avoid transmission issues.
Will this code come back after clearing?
If the underlying issue is not resolved, yes, it will return.
Why is this code showing with a transmission issue?
The sensor measures fluid temperature, which directly impacts transmission performance.
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