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 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 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.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.