Transmission Fluid Temperature Sensor Out Of Range
The transmission fluid temperature is outside the expected range.
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What it means (plain English)
The temperature of the transmission fluid is either too high or too low, which can cause shifting issues and damage the transmission over time.
What the computer is actually seeing
The computer monitors the transmission fluid temperature and expects it to stay within a specified range (typically 150°F to 220°F). When the reading falls outside of this range, it sets the SPN 1573 code.
What a healthy reading looks like
Transmission fluid temperature should typically be between 150°F (65°C) and 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.
- 11. Check the transmission fluid level. Ensure it's at the correct level and top off if needed. Decision: If low, fill and test drive to see if code returns.
- 22. Inspect wiring and connectors related to the transmission fluid temperature sensor for any signs of damage or corrosion. Decision: If damaged, repair or replace as necessary, then retest.
- 33. Use a scan tool to monitor the live data from the transmission fluid temperature sensor while the engine is running. Decision: If the values are unrealistic (e.g., below 0°F or well above 220°F), replace the sensor.
- 44. If the sensor data is within expected values but the code persists, check the TCM for faults or updates. Decision: If TCM issues are found, consider replacement or reprogramming.
Common causes
- Faulty transmission fluid temperature sensor
- Damaged wiring or connectors
- Low transmission fluid level
- Faulty transmission control module (TCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so while it may be drivable, it's best to fix it soon to avoid transmission damage.
Will the code come back after repairs?
If the root cause is fixed (like a bad sensor or wiring), the code should not return.
Why does this code sometimes pair with SPN 111?
SPN 111 is also related to temperature but for the engine; it might indicate overall cooling issues affecting both systems.
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