Transmission Fluid Temperature Sensor 1 - Above Normal Operating Range
The transmission fluid temperature is too high.
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What it means (plain English)
The transmission fluid temperature should be around 175°F to 220°F during operation; if it goes above this range, it triggers this fault code indicating an overheating problem.
What the computer is actually seeing
The engine control module (ECM) monitors the input from the transmission fluid temperature sensor. When the sensor sends a reading above the normal range, typically above 235°F, the ECM logs SPN 1572 and may also trigger a warning light.
What a healthy reading looks like
Transmission fluid temperatures should be between 175°F and 220°F; any reading above 235°F triggers the code.
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 within the recommended range.
- 22. If fluid level is okay, visually inspect wiring and connectors to the transmission fluid temperature sensor for damage or corrosion.
- 33. Use a scan tool to read the current transmission fluid temperature; compare it against expected values of 175°F to 220°F.
- 44. If the reading is above 235°F, inspect the transmission cooler and system for blockages or leaks that could cause overheating.
- 55. If everything appears normal with fluid levels and wiring, consider replacing the transmission fluid temperature sensor.
Common causes
- Low transmission fluid level
- Faulty transmission fluid temperature sensor
- Excessive load on the transmission
- Cooling system issues causing overheating
- Wiring issues or bad connections to the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not ideal; overheating can damage the transmission. Fix it soon.
Will the code come back after clearing it?
If the root cause isn't fixed, yes, it will likely return.
Why does this code pair with SPN 1571?
Both relate to transmission fluid temperature but indicate different temperature levels.
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