Code Definition

P2305 — Ignition Coil ‘B’ Secondary Circuit

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

About P2305

P2305 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Mazda vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2305 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 P2305 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 Powertrain Control Module (PCM) monitors the secondary ignition performance of ignition coil B by analysing primary circuit feedback and crankshaft speed variations during the combustion event for the associated cylinder. DTC P2305 is set when the PCM determines that the secondary ignition output from coil B is insufficient or abnormal, meaning the expected spark energy is not being delivered. The secondary side of the coil supplies the high voltage that jumps the spark plug gap to ignite the mixture, so a weak secondary output gives a poor or missing spark on that cylinder. When this code...

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