Engine Ambient Air Temperature Sensor Out of Range
The engine ambient air temperature sensor reading is too high or too low.
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What it means (plain English)
The engine's temperature sensor is giving incorrect readings - either too hot or too cold, affecting performance and emissions control.
What the computer is actually seeing
The engine control module (ECM) receives a voltage signal from the ambient air temperature sensor. When the sensor fails or the signal is out of the expected range, the ECM triggers a fault code.
What a healthy reading looks like
Expected sensor voltage should be between 0.5V (cold temp) and 4.5V (hot temp); typical ambient temperature range is -40 to 125 degrees Fahrenheit.
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 wiring and connections to the ambient air temperature sensor for damage or corrosion. If found, repair or replace as needed.
- 22. With the engine off, disconnect the sensor and check for continuity in the wiring harness; it should show continuity. If no continuity, repair the wiring.
- 33. With the engine running, measure the voltage at the sensor connector. It should fall within 0.5V to 4.5V based on temperature. If voltage is outside this range, replace the sensor.
- 44. If the sensor checks out but the code returns, inspect the ECM for issues or programming.
- 55. Clear the fault code and run the vehicle to see if the code returns. If it does, further investigation of the ECM or replacement may be necessary.
Common causes
- Faulty ambient air temperature sensor
- Wiring issues or bad connectors
- Corroded terminals
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but drivability may be affected. Monitor performance and emissions.
Will the code come back after clearing it?
If the issue remains, the code will likely reappear.
Why does this fault code pair with others?
It often pairs with codes related to air intake sensors or temperature readings due to system interdependencies.
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