INLET AIR TEMPERATURE SENSOR 1 VOLTAGE HIGH
The inlet air temperature sensor is reporting a voltage that is too high.
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What it means (plain English)
The computer measures the temperature of the air coming into the engine using a sensor. If this sensor detects a voltage higher than its normal range, it thinks the air temperature is too high, which can mess with engine performance.
What the computer is actually seeing
A signal from the inlet air temperature (IAT) sensor that is outside of the expected voltage range, typically above 4.9 volts.
What a healthy reading looks like
The inlet air temperature sensor usually operates between 0.5 to 4.5 volts, depending on the air 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.
- 11. Check the inlet air temperature sensor wiring for any visual damage, shorts, or loose connections. Decision point: Repair any visible wiring issues or proceed to step 2 if none found.
- 22. Measure the voltage at the inlet air temperature sensor connector with the key on, engine off. Expected value: 0.5 to 4.5 volts. Decision point: If voltage is above 4.9 volts, proceed to step 3; if within range, the sensor may be good, check ECM.
- 33. Disconnect the sensor and check the resistance of the sensor itself. Expected resistance varies by temperature but should be within a specific range according to its specs. Decision point: If resistance is out of spec, replace the sensor; if within spec, investigate further towards the ECM.
Common causes
- Faulty inlet air temperature sensor
- Wiring issues (short or open circuit)
- Corrosion or bad connectors
- Faulty Engine Control Module (ECM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's drivable, but engine performance may suffer. Address it soon to avoid potential emissions issues.
Will the code come back after clearing?
If the underlying issue is fixed, it should stay off; otherwise, it will return.
Why does this code pair with other codes?
Many IAT sensor problems can affect air-fuel mixture calculations, leading to multiple related faults.
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