P0112
Low SeverityIntake Air Temperature Sensor Circuit Low
Fuel System
What Does P0112 Mean?
IAT sensor voltage is too low, indicating impossibly high air temperature. Usually a short circuit in the sensor or wiring.
Common Fix
Replace IAT sensor
Estimated Cost (DIY)
$10 - $30
Symptoms
- ⚠️Check engine light
- ⚠️Slightly rich running
- ⚠️Decreased fuel economy
Common Causes
Shorted IAT sensorlikely
Short in wiringpossible
Corroded connectorpossible
How to Diagnose P0112
- 1Disconnect sensor — if code changes to P0113, sensor is bad
- 2Check wiring for shorts to ground
- 3Measure sensor resistance
- 4Replace sensor
Need to read or clear this code?
Shop OBD2 Scanners on Amazon →Frequently Asked Questions
- What does low IAT reading mean?
- Low voltage means the ECM thinks the air is very hot, so it trims fuel delivery. Usually a sensor fault.
- How to test IAT sensor?
- Measure resistance — should be ~2-3K ohms at 70°F. Much lower indicates a short.