Transmission fluid temperature sensor A circuit high
The temperature sensor for the transmission fluid is reporting a high voltage signal.
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What it means (plain English)
Inside the transmission, there's a temperature sensor that measures how hot the fluid is. If it detects a voltage above what it should be, like over 4.5 volts, it triggers this code.
What the computer is actually seeing
The computer sees an abnormal voltage reading from the transmission fluid temperature sensor that exceeds defined limits, usually over 4.5 volts.
What a healthy reading looks like
Normal operation voltage for the sensor is typically between 0.5 to 4.5 volts, depending on the temperature; at 20°C, expect about 1.5 volts.
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; should be within specified range.
- 2Inspect the wiring and connector for the transmission fluid temperature sensor; look for damage or corrosion.
- 3Measure the voltage at the transmission fluid temperature sensor; it should be between 0.5 to 4.5 volts.
- 4If voltage is high (over 4.5V), inspect for short circuits in the wiring to the sensor.
- 5If wiring checks out, replace the transmission fluid temperature sensor and retest.
Common causes
- Shorted sensor wiring
- Faulty transmission fluid temperature sensor
- Corroded connectors
- Low transmission fluid
- Faulty transmission control module (TCM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive long distances as overheating could damage the transmission.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code relate to others like P0710?
These codes are all related to the transmission temperature sensor issues, often due to wiring or sensor faults.
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