Intake Air Temperature Sensor 1 - Voltage Above Normal
The intake air temperature sensor is reporting a high voltage reading.
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 intake air temperature sensor is giving a signal that's higher than expected, which can mess with engine performance and fuel efficiency.
What the computer is actually seeing
The ECM sees a voltage reading from the intake air temperature sensor that exceeds the specified normal range, usually over 5 volts.
What a healthy reading looks like
Normal voltage for intake air temperature sensor typically ranges from 0.5V to 4.5V based on intake air temperature values, where 0.5V equals around -40°C and 4.5V equals around 125°C.
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 connectors for the intake air temperature sensor for signs of damage or corrosion. Is there any visible damage? If yes, repair or replace the damaged wiring/connectors.
- 22. Use a multimeter to test the voltage at the intake air temperature sensor connector. Is the reading over 5V? If yes, the wiring is likely shorted directly to power or there's a fault in the ECM. Proceed with wiring repairs or ECM testing as needed.
- 33. If the voltage is within the expected range, remove the sensor and inspect it for contamination. Is it clean? If not, clean or replace the sensor if it won’t function properly after cleaning.
- 44. Reconnect the sensor and clear the trouble codes. Does the code come back after a drive cycle? If yes, replace the sensor.
Common causes
- Wiring issues (frayed, shorted, or corroded wires)
- Faulty intake air temperature sensor
- Poor electrical connections or connectors
- Contamination or debris affecting sensor operation
Typical repair cost
$$ (100-400)
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but there's a risk of decreased engine performance and efficiency. Fix soon.
Will this code come back after resetting?
If the issue isn't resolved, yes, it will likely return after a drive cycle.
Why does this code pair with other codes?
High intake air temperature readings can affect other systems like fuel delivery and air management, triggering related fault codes.
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 →