DODGE Code P1112: Causes, Symptoms, and Repairs
1. Meaning of DODGE Code P1112
Code P1112 is a diagnostic trouble code (DTC) related to the Intake Air Temperature (IAT) sensor.
The IAT sensor can be:
- Integrated into the Mass Air Flow (MAF) sensor.
- Mounted on the air filter housing, depending on the vehicle model.
IAT Sensor Operation
- It detects the intake air temperature and sends a signal to the Engine Control Module (ECM).
- It contains a thermistor that is sensitive to temperature changes.
- The higher the temperature, the lower the resistance.
- The ECM uses this data to adjust fuel injection, ignition timing, and other parameters.
If the sensor signal is abnormal or intermittent, the code P1112 is stored and the check engine light may illuminate.
2. Possible Symptoms of Code P1112
- Illuminated check engine light
- Engine malfunctions (rough idle, poor performance)
- Excessive fuel consumption
- Hard starting in cold weather
3. Possible Causes of Code P1112
Code P1112 can be caused by:
- Faulty Intake Air Temperature (IAT) sensor
- Open or shorted IAT sensor harness
- Poor electrical connection in the IAT circuit
4. How to Repair DODGE Code P1112?
1. Check the wiring and connectors condition
- Visually inspect the IAT sensor wiring harness.
- Look for broken, corroded, or shorted wires.
- Check the connector pins (broken, bent, or corroded).
2. Test the IAT sensor with a multimeter
- Disconnect the IAT sensor and measure the resistance.
- Compare the obtained value to the manufacturer’s specifications.
- If the resistance is out of tolerance, replace the sensor.
3. Check the IAT sensor signal with an OBD-II scanner
- Read the real-time values to see if the displayed air temperature is consistent.
- If the value is stuck or inconsistent, suspect a faulty sensor.
4. Clear the Code and Test the Vehicle
- Clear the trouble code with an OBD-II scanner.
- Perform a road test to see if the code reappears.
Conclusion
DODGE code P1112 is usually caused by a faulty IAT sensor or a wiring problem. An accurate diagnosis by following the steps above will resolve the issue and improve engine operation and fuel consumption.