Transmission Fluid Temperature Sensor Circuit High
The transmission fluid temperature sensor is reporting a voltage that is too high.
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What it means (plain English)
The computer checks the temp of the transmission fluid through a sensor, which should give it a voltage reading. If the voltage exceeds a certain threshold (typically over 5 volts), it throws this code because it indicates that the sensor is likely bad or there's a wiring issue.
What the computer is actually seeing
A voltage reading above the expected range from the transmission fluid temperature sensor, indicating excessive fluid temperature or a malfunctioning sensor.
What a healthy reading looks like
Transmission fluid temperature should be between 70°F to 210°F (21°C to 99°C), corresponding to a sensor voltage typically between 0.5V (cold) to 4.5V (hot) under normal conditions.
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.
- 1Check the transmission fluid level; if low, refill to the correct level and retest.
- 2Inspect wiring and connectors for damage, shorts, or corrosion. Repair as necessary and retest.
- 3Using a multimeter, measure the voltage at the sensor connector. If it's above 5V with the engine running, check for shorts in the wiring.
- 4Replace the sensor if the voltage reading is correct but still throws the code after wiring checks.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring or connector issues (short to voltage)
- Low transmission fluid level
- Faulty PCM (Powertrain Control Module)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's usually safe to drive if the transmission is performing normally, but the fluid overheating could lead to further damage.
Will this code come back after I repair it?
If the underlying issue is resolved, the code should clear itself; otherwise, it will return.
Why does this code pair with SPN 1571?
SPN 1571 is related to the same system and often triggers when the temperature reading is out of range.
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