Intake Air Temperature Sensor Range/Performance Problem
The engine control module (ECM) sees an issue with the intake air temperature signal.
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What it means (plain English)
The engine computer is reading the temperature of the air coming into the engine and thinks the values are off, indicating a problem with the temperature sensor or its circuit.
What the computer is actually seeing
The ECM monitors the intake air temperature through a sensor that should typically output between 0.5 to 4.5 volts, reflecting temperatures from -40°F to 250°F. When it sees values outside expected ranges for 2 seconds or more, it triggers this code.
What a healthy reading looks like
Expected voltage from the IAT sensor is between 0.5 to 4.5 volts. The temperature conversion should correlate; for example, 1.5V should represent around 68°F.
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. Visual Inspection: Check the wiring and connector at the intake air temperature sensor. Look for signs of damage, corrosion, or loose connections. Decision Point: If damaged, repair/replace and recheck. If not, move to step 2.
- 22. Check Sensor Resistance: Disconnect the IAT sensor and use a multimeter to measure its resistance at a known temperature (around 70°F should be around 1.6k ohms). Decision Point: If resistance is out of spec, replace the sensor. If within spec, move to step 3.
- 33. Measure Voltage Output: With the key on, engine off, measure the voltage at the IAT sensor connector. You should see a voltage based on ambient air temperature. Decision Point: If voltage is out of range expected (0.5 to 4.5 volts), test the wiring circuit for shorts or opens. If wiring is good, the ECM may be faulty.
Common causes
- Faulty intake air temperature sensor
- Damaged wiring or connector to the sensor
- Corroded pins in the wiring harness
- Air intake leaks affecting sensor readings
- ECM software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but performance can be affected, and fuel economy may decrease. Fix this soon.
Could this code come back after clearing it?
Yes, if the underlying issue isn't fixed, the code will likely return.
Why does this code pair with other codes like P0113?
Codes like P0113 indicate similar issues with the intake air temperature sensor, often pointing to a sensor malfunction or wiring issue.
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