Transmission Fluid Temperature Sensor Fault
Indicates a problem with the transmission fluid temperature sensor.
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What it means (plain English)
The transmission fluid temperature sensor is telling the computer that the fluid temperature is either too high or too low, which could lead to transmission damage if not addressed.
What the computer is actually seeing
The engine control module (ECM) expects the transmission fluid temperature to be within a certain range, typically between 160°F and 220°F (71°C to 104°C).
What a healthy reading looks like
Transmission fluid temperature should be between 160°F and 220°F (71°C and 104°C). A drastic drop below or spike above this range triggers the fault.
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 transmission fluid level; it should be near the full mark. If low, fill to the appropriate level with the correct fluid type.
- 2Inspect the wiring and connectors to the transmission fluid temperature sensor for damage, corrosion, or loose connections.
- 3Using a scan tool, check the live data for transmission fluid temperature; if it's outside of 160°F to 220°F (71°C to 104°C), proceed with further diagnosis.
- 4Test the resistance of the transmission fluid temperature sensor; compare readings to the manufacturer's specifications for confirmation.
Common causes
- Faulty transmission fluid temperature sensor
- Wiring issues or connector problems
- Low transmission fluid level or dirty fluid
- Faulty ECM or software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but address it soon to prevent potential transmission damage.
Will the code come back after clearing it?
If the issue is not resolved, the code will likely return.
Why does this code appear alongside SPN 2371?
SPN 2371 relates to a similar sensor but may indicate a different fault like a circuit problem.
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