Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0113: IAT Sensor Circuit High Temperature Indicated: Notes
Intake Air Temperature (IAT) sensor is a thermistor. PCM applies and monitors a 5-volt reference signal to sensor. When air is cold, sensor resistance is high and PCM will measure a high signal voltage. If air is warm, sensor resistance is low causing PCM to measure low voltage.
Code P0113 will set when the following conditions are present.
- Signal voltage indicates an intake air temperature greater than 284°F (140°C).
- Vehicle speed is greater than 35 MPH.
- Conditions are met for at least for 5 seconds.NOTE: Test numbers refer to numbers on diagnostic chart.
- Scan tester may be used to diagnose this fault since PCM transmits actual values when fault is present. A grounded circuit will cause tester to display a temperature of about 147°C.
- If scan tester displays about -40°C with IAT sensor disconnected, PCM and wiring are okay. Replace IAT sensor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.