Code Definition

P0102 — Mass or Volume Air Flow Circuit Low Input

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

About P0102

P0102 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 P0102 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 P0102 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 P0102 code indicates a low input condition in the circuit of the Mass Air Flow (MAF) sensor. This sensor measures the amount of air entering the engine, providing essential data to the Engine Control Module (ECM) for calculating the correct air-fuel mixture for efficient combustion. A low input signal from the MAF sensor might suggest a fault in the sensor or an issue in the circuit, leading to various engine performance problems, including poor fuel efficiency, rough running, and increased emissions.

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