Code Definition

P0111 — Intake Air Temperature Circuit Range/Performance

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

About P0111

P0111 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 P0111 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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 P0111 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 P0111 code indicates a problem with the range or performance of the Intake Air Temperature (IAT) sensor circuit. This sensor measures the temperature of air entering the engine's intake system, providing essential data to the Engine Control Module (ECM) for optimal fuel mixture and ignition timing. The ECM sets this code when it detects that the IAT sensor's readings are not within the expected range or the sensor is not performing as intended, which can lead to issues like improper air-fuel ratio, reduced engine performance, and increased emissions.

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