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.
Code P0112, IAT Sensor Circuit (Low Temperature Indicated): Notes
The Intake Air Temperature (IAT) sensor is a thermistor. PCM applies and monitors 5 volts 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 P0112 will set when the following conditions are present.
- Engine coolant temperature is greater than 140°F (60°C).
- Mass air flow is less than 12 grams per second.
- Vehicle speed is less than 25 MPH.
- IAT signal voltage indicates an intake air temperature less than -29°F (-34°C) for 5 seconds.
With Code P0112 set, PCM will substitute a default value of 61°F (16°C) for intake air temperature. Code P0112 does not illuminate the Malfunction Indicator Light (MIL).
- An open sensor, wire or connection will cause Code P0112 to set. An open circuit would cause Tech-1 to display approximately -40°F (-40°C). This test determines if wiring and PCM are okay.
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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.
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