Transmission Fluid Temperature Sensor A Circuit Out of Range
Transmission fluid temperature sensor reading is out of expected range.
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What it means (plain English)
The transmission fluid temperature sensor isn't giving a reading the computer expects, which could mean the sensor is faulty or the fluid is too hot or cold.
What the computer is actually seeing
The computer is getting voltage readings from the sensor that are consistently outside the normal thresholds, usually below 100°F or above 250°F under normal operating conditions.
What a healthy reading looks like
The transmission fluid should be around 175°F to 220°F when operating under normal conditions; sensor readings should be between 0.5V and 4.5V.
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 between the minimum and maximum marks on the dipstick. If low, add fluid and recheck codes.
- 22. Inspect the wiring and connectors of the transmission fluid temperature sensor for any visible damage or corrosion. Repair as necessary.
- 33. Using a diagnostic tool, read the temperature values from the transmission fluid temperature sensor. If the readings are outside the expected range (0.5V - 4.5V), replace the sensor.
- 44. If the sensor is within range, monitor the transmission temperature during operation. If it exceeds 250°F or stays below 100°F under normal conditions, examine the fluid quality and system operation.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring short or open in the sensor circuit
- Corrosion in the connector or terminals
- Low transmission fluid level
- Contaminated transmission fluid
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
You should not drive too far; if the fluid temperature is genuinely problematic, it can lead to transmission failure.
Will this issue come back after I clear the code?
It can if the underlying problem isn't fixed, like a faulty sensor or wiring issue.
Why does this code pair with SPN 0731?
SPN 0731 is related to the temperature sensor circuit, and if there's a fault in the circuit, multiple codes may trigger.
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