Intake Air Temperature Sensor 2 - Voltage Out of Range
The intake air temperature sensor 2 is reading out of expected voltage range.
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What it means (plain English)
The engine's computer has a second intake air temperature sensor that tells it how hot the air is. If the sensor sends a voltage that’s too high or too low, it triggers this code.
What the computer is actually seeing
The engine control module (ECM) expects the intake air temperature (IAT) voltage to be between 0.5V and 4.5V. Any reading outside this range indicates a problem.
What a healthy reading looks like
0.5V to 4.5V when running, ambient temperature when off.
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 the wiring and connector for intake air temperature sensor 2. Look for any damage, corrosion, or loose connections. Decide: is wiring intact?
- 2Measure the voltage at the intake air temperature sensor 2 with the key on and engine off. You should read around 0.5V to 4.5V. If you see no voltage or it’s out of range, replace the sensor. If readings are normal, proceed to step 3.
- 3Check for air filter restriction or blockage. Replace the air filter if it’s dirty and recheck the code. Did the code clear?
- 4Inspect the intake air temperature sensor 1 (if present) for functionality. Compare readings. Is sensor 1 normal? If sensor 2 is out of range, replace sensor 2.
Common causes
- Faulty intake air temperature sensor 2
- Wiring issues such as shorts or opens
- Corroded or loose connector
- Air filter blockage or intake restrictions
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so you can drive short distances, but fix it soon to avoid performance issues.
Will this code come back after clearing?
If the issue isn't fixed, yes, it will return.
Why does this code pair with SPN 1384?
SPN 1384 indicates a similar issue with the first intake air temperature sensor, often indicating a systemic problem with the air intake system.
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