Transmission Fluid Temperature Sensor 1
Transmission fluid temperature sensor reading is out of range.
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What it means (plain English)
The sensor that checks the temperature of the transmission fluid is reading a temperature that’s too high or too low for normal operation.
What the computer is actually seeing
The Engine Control Module (ECM) expects the transmission fluid temperature to be within a certain range, typically around 175°F to 225°F (79°C to 107°C), depending on model and conditions. An out-of-range signal triggers the fault code.
What a healthy reading looks like
Transmission fluid temperatures should typically range between 175°F (79°C) and 225°F (107°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. Check the transmission fluid level and condition. Ensure it's at the recommended level and clean. A low or dirty fluid can cause temperature issues.
- 2Decision Point: Is fluid level correct and in good condition? If NO, fill or change the fluid and retest. If YES, proceed to step 2.
- 32. Visually inspect the wiring and connectors to the transmission fluid temperature sensor for damage or corrosion. Repair as necessary.
- 4Decision Point: Are the wiring and connectors intact? If NO, repair the wiring or replace the connector and retest. If YES, proceed to step 3.
- 53. Use a scanner to monitor the live data from the transmission fluid temperature sensor. Check if the readings fluctuate with temperature changes (e.g., should vary significantly when the fluid warms up).
- 6Decision Point: Are the readings reasonable and responsive? If NO, the sensor is likely faulty. If YES, the issue may be with the transmission control module.
Common causes
- Faulty transmission fluid temperature sensor
- Damaged wiring or connectors to the sensor
- Low or contaminated transmission fluid
- Faulty transmission control module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix this soon as it can lead to overheating, which risks transmission damage.
Will this code come back after clearing?
If the underlying issue isn't resolved, it likely will return.
Why does this code sometimes pair with other codes?
Multiple codes can indicate a common issue like overheating or sensor malfunction.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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