Code Definition

P0112 — Intake Air Temperature Circuit Low Input

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0112

P0112 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0112 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0112 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0112 code indicates a low input condition in the circuit of the Intake Air Temperature (IAT) sensor. This sensor measures the temperature of the air entering the engine's intake system and is crucial for the Engine Control Module (ECM) to properly manage the air-fuel mixture and ignition timing. A low input signal from the IAT sensor may suggest an issue with the sensor or a fault in its circuit, leading to problems such as poor engine performance, increased emissions, and reduced fuel efficiency.

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