P0112 2012 Nissan Pathfinder Code - Intake Air Temperature Circuit Low Input

P0112 is a diagnostic trouble code (DTC) that indicates the Intake Air Temperature (IAT) sensor circuit is reporting a lower than expected voltage, suggesting the sensor is reading a temperature that is colder than the actual air entering the engine.

Symptoms can include a check engine light, poor fuel economy, rough idling, difficulty starting in cold conditions, and a possible decrease in overall engine performance.

Common causes include a faulty or disconnected IAT sensor, corrosion or damage to the sensor connector, shorted or open wiring in the IAT sensor circuit, or issues with the engine control module (ECM).

Begin by visually inspecting the IAT sensor and its connector for any signs of damage or corrosion. Use a multimeter to check for proper voltage and ground at the sensor connector. If the wiring checks out, consider testing or replacing the IAT sensor itself.

Repair or replace any damaged or corroded wires or connectors. If the IAT sensor is faulty, replace the sensor. Clear the code from the ECM to see if it returns; if it does, further diagnosis of the ECM and circuit may be necessary.

While it's unlikely to cause immediate severe damage, driving for an extended period with this code can lead to reduced engine performance, increased emissions, and potentially worse fuel economy, which can strain the engine over time.

While OEM parts are recommended for best compatibility and performance, aftermarket parts that meet OEM specifications can also be used effectively. Always ensure any replacement part is compatible with your specific vehicle model.

It is moderately urgent. While the vehicle can typically still be driven, addressing the issue promptly can prevent potential long-term effects like decreased engine performance and increased fuel consumption.