Intake Air Temperature Sensor Circuit Range/Performance Problem
The intake air temperature sensor has reported readings outside normal range.
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What it means (plain English)
The intake air temperature sensor monitors the temperature of the air coming into the engine. If it’s too cold or too hot, the engine control module (ECM) gets confused about how to mix air and fuel properly.
What the computer is actually seeing
The ECM expects to see temperature readings from the intake air temperature sensor between -40°C and 125°C. If readings drop below this range or exceed it significantly, a fault code is set.
What a healthy reading looks like
Intake air temperature should generally be between 15°C and 50°C under normal operating conditions. Ideally, it should match the ambient air temperature closely.
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 connector at the intake air temperature sensor for damage or corrosion.
- 22. Inspect the air intake system for leaks or blockages.
- 33. Use a multimeter to check the voltage output of the intake air temperature sensor; it should be 0.5V at -40°C and 4.5V at 125°C. If it’s outside this range, replace the sensor. Prior to replacing, clean the connections and clear the fault code before retesting.
- 44. If the issue persists, scan the ECM for additional fault codes before concluding whether the ECM is faulty.
Common causes
- Faulty intake air temperature sensor
- Wiring issue or damaged connector
- Air intake leaks
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but performance may be affected and fuel efficiency could drop.
Will this problem come back after fixing?
If underlying issues like wiring or leaks aren’t addressed, the code may return.
Why does this code pair with other codes?
Multiple codes can indicate that there is a deeper issue in the engine management system affecting performance.
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