Code Definition

P2311 — Ignition Coil 4 Ionisation Not Complete

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

About P2311

P2311 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 P2311 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

Some ignition systems use ion sensing, where the Powertrain Control Module (PCM) measures the small ionisation current that flows through the ignition coil and spark plug just after the spark and uses it to confirm that combustion took place in the cylinder. DTC P2311 is a generic powertrain code set when the PCM does not detect the expected ionisation feedback from ignition coil 4 within the calibrated time or amplitude window after the spark event. This points to incomplete ionisation in cylinder 4, usually linked to a weak spark, a misfire, or abnormal combustion rather than the monitoring ...

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