Intake Air Temperature Sensor Out of Range
The intake air temperature (IAT) sensor is reporting values that are outside normal operating range.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The sensor that measures how hot the air going into the engine is giving readings that are too high or too low, often causing performance issues.
What the computer is actually seeing
The engine control module (ECM) expects the IAT sensor voltage to vary between 0.5 to 4.5 volts, corresponding to temperatures from -40 to 130 degrees Celsius. If the voltage is below 0.2 volts or above 4.8 volts, you'll trigger this code.
What a healthy reading looks like
0.5 to 4.5 volts representing -40 to 130 °C (-40 to 266 °F).
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. Inspect the IAT sensor wiring and connectors for damage or corrosion. Fix any issues found. Decision: If wiring is intact, proceed to step 2, otherwise repair wiring.
- 22. Check the IAT sensor for physical damage or improper installation. Replace it if damaged. Decision: If the sensor is intact and correctly installed, proceed to step 3, otherwise replace sensor.
- 33. Measure the voltage at the IAT sensor connector while the engine is running. It should be between 0.5 and 4.5 volts. Decision: If voltage is within range, the issue may be elsewhere. If out of range, replace the sensor.
Common causes
- Faulty IAT sensor
- Wiring issues or damaged connectors
- Intake air leaks
- Incorrect installation of the IAT sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
You can drive it, but expect reduced engine performance and fuel efficiency. It's best to fix it soon.
Will this code come back after I clear it?
If the underlying issue is not fixed, the code will likely return.
Why does this code sometimes pair with SPN 2200?
SPN 2200 indicates an issue with the engine coolant temperature, which can affect air intake measurements and trigger both codes.
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