Transmission Fluid Temperature Sensor
Transmission fluid temperature sensor circuit is out of range or faulty.
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What it means (plain English)
The transmission fluid temperature sensor tells the computer how hot the fluid is. If it's too hot or too cold, or if the sensor is broken, the computer will throw a code.
What the computer is actually seeing
The computer monitors the transmission fluid temperature and expects it to be within a specific range, typically around 175°F to 200°F (80°C to 93°C) during normal operation. Values lower than 150°F or higher than 220°F could trigger a fault.
What a healthy reading looks like
Normal operating temperature for transmission fluid is between 175°F and 200°F (80°C and 93°C). Should not exceed 220°F (104°C).
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; ensure it's at the manufacturer-recommended level.
- 2Inspect the wiring and connectors to the transmission fluid temperature sensor for any visible damage or corrosion.
- 3Using a scan tool, check the actual temperature reading from the sensor; it should be within 175°F to 200°F (80°C to 93°C).
- 4If the reading is out of range, backprobe the sensor with a multimeter to check for proper voltage (typically 0.5V to 4.5V depending on temperature).
- 5If the voltage is irregular or out of range, replace the transmission fluid temperature sensor.
- 6If the sensor is functioning normally, test the TCM and related wiring for faults.
Common causes
- Failed transmission fluid temperature sensor
- Wiring issues or short circuits in the sensor circuit
- Faulty transmission control module (TCM)
- Low transmission fluid levels or overheating
- Corroded connectors or harness issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but monitor transmission performance; fix soon to avoid potential overheating.
Will this code come back after clearing?
If the issue isn't resolved, it will likely return after clearing.
Why does it pair with codes SPN 5201 and SPN 5203?
These codes are related to other transmission fluid temperature sensors or their circuits, indicating a broader issue in the system.
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