Code Definition

P0312 — Cylinder 12 Misfire Detected

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

About P0312

P0312 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.

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 P0312 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 P0312 fault code is triggered when the powertrain control module (PCM) detects a misfire in cylinder 12. This indicates that the air-fuel mixture in cylinder 12 is not combusting as intended, which can lead to rough engine performance, loss of power, or increased emissions.

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