Engine Intake Air Temperature Sensor
Indicates a problem with the Engine Intake Air Temperature (IACT) Sensor.
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 Control Module (ECM) uses the intake air temperature sensor to monitor the temperature of the air entering the engine, helping to optimize fuel injection and ignition timing.
What the computer is actually seeing
The ECM expects to see readings between -40°C to 125°C (-40°F to 257°F). If the signal reads outside this range or is interrupted, a fault code triggers.
What a healthy reading looks like
Intake air temperature should typically be within 10°C to 40°C (50°F to 104°F) when the engine is running in normal conditions, matching ambient temperature.
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 damage or corrosion. Repair as necessary. Decision: Is the connector okay? Yes: Go to step 2. No: Repair or replace the connector.
Common causes
- Wiring issues (broken, pinched, or corroded wires)
- Faulty intake air temperature sensor
- Connector issues (loose or damaged connectors)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but performance may suffer and fuel economy will decrease. Fix it soon.
Will the code come back after clearing?
It may return if the underlying issue isn't fixed. Monitor after repairing.
Why do I also see SPN 1216?
SPN 1216 indicates a circuit fault that might result from the same issues affecting the sensor.
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