Intake Air Temperature Sensor 1
Intake air temperature is out of range.
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What it means (plain English)
The engine control module (ECM) is not getting the right temperature reading from the intake air temperature sensor, which affects air-fuel mixture calculations.
What the computer is actually seeing
The ECM expects the intake air temperature to be between -40°F to 221°F (-40°C to 105°C). When the reading is outside this range, it triggers this code.
What a healthy reading looks like
Intake air temperature readings should be between 20°F to 150°F (-6°C to 65°C) during normal operation.
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 intake air temperature sensor connector for any signs of damage or corrosion. Repair as necessary.
- 2Measure the resistance of the sensor at various temperatures; it should show a specific range (typically 2,500 ohms at 25°C). If it doesn't match, replace the sensor.
- 3Inspect the wiring harness for signs of wear or shorts. Use a multimeter to check for continuity from the ECM to the sensor. Repair any shorts or opens found.
- 4Clear the code and take the vehicle for a test drive. If the code returns immediately, suspect a faulty sensor or wiring issue.
Common causes
- Faulty intake air temperature sensor
- Wiring issues or damaged connectors
- Short or open circuits in the intake air temperature sensor circuit
- Contaminated or damaged sensor element
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but may cause performance issues; fix soon.
Will this code come back after clearing?
If the issue persists, it will likely return after a drive cycle.
Why might it pair with SPN 1390?
SPN 1390 is often related to the same intake temp sensor circuit issues.
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