Engine Intake Air Temperature Sensor 1
Intake air temperature sensor readings are out of 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 engine's computer isn't getting proper temperature readings from the intake air temperature sensor, which tells it how hot the air entering the engine is. This can mess with the fuel-air mix and engine performance.
What the computer is actually seeing
The engine control module (ECM) sees abnormal voltages from the intake air temperature sensor, indicating temperatures that are either too high or too low compared to programmed thresholds.
What a healthy reading looks like
Normal intake air temperature readings are typically between 20°F and 150°F (-6°C to 65°C). Voltage from the sensor usually ranges from 0.5V (cold) to 4.5V (hot).
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 wiring and connectors to the intake air temperature sensor for damage or corrosion. Are they secure?
- 2Measure the voltage at the sensor connector. Is it within expected range (0.5V - 4.5V)?
- 3Inspect the actual intake air temperature with a scan tool. Does it match the sensor reading? If not, replace the sensor.
Common causes
- Faulty intake air temperature sensor
- Wiring issues or bad connections
- Intake air leaks
- ECM issues
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, but engine performance may be affected. Fix it soon.
Will this code come back after I clear it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code show up with SPN 3205?
Both codes are related to intake air temperature sensor issues, as they monitor similar functions.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →