A/C Evaporator Temperature Sensor
Evaporator temperature sensor is out of the expected range.
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What it means (plain English)
The A/C system isn't keeping cool because the sensor that measures the evaporator's temperature is not working right. It should read between 32°F and 50°F but is outside this range.
What the computer is actually seeing
The ECM expects the evaporator temperature sensor to send a signal that reflects proper cooling operation, typically between 32°F and 50°F. If it reads below or above this range, it triggers the code.
What a healthy reading looks like
Expected sensor readings between 32°F (0°C) to 50°F (10°C) while A/C is operating in cooling mode.
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 A/C system refrigerant level; it should be within manufacturer specs.
- 2Inspect wiring and connectors to the evaporator temperature sensor for corrosion or damage.
- 3Using a scan tool, monitor the evaporator temp sensor reading; should be between 32°F and 50°F during operation.
- 4If reading is out of range, replace the evaporator temperature sensor and clear the code.
- 5If code reappears after sensor replacement, consider testing the ECM.
Common causes
- Wiring issues or damage to the connector
- Faulty evaporator temperature sensor
- Refrigerant leaks causing low pressure
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the A/C will likely not function properly until resolved.
Will this code come back after clearing?
It may if the underlying issue isn't fixed.
Why does this code appear with A/C system issues?
Because it directly relates to the sensor that controls the evaporator temperature, which is crucial for proper A/C operation.
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