Hybspec

P2305

Wysoki

Incorrect Voltage in Ignition Coil B Secondary Circuit. The PCM detects voltage deviations in the secondary circuit of cylinder B ignition coil.

OBD-II (EN): Ignition Coil B Secondary Circuit Voltage Malfunction

Code P2305 indicates incorrect voltage in the secondary circuit of ignition coil B, which may cause rough engine running, jerking, or the Check Engine light. The most common causes are a faulty ignition coil, worn spark plug, or high-voltage wiring issues. Professional diagnosis is recommended to pinpoint the fault and avoid further engine damage.

Symptoms

• Check Engine Light (MIL) is on • Engine jerking while driving or at idle • Noticeable misfire on the cylinder associated with coil B • Increased fuel consumption • Loss of engine power • Difficulty starting the vehicle • Possible vibrations transmitted to the body

Possible causes

• Faulty or burnt ignition coil for cylinder B • Worn or damaged spark plug in cylinder B • Open or short circuit in the high-voltage secondary circuit wire • Faulty Ignition Control Module (ICM) or PCM • Incorrect injection maps / lack of ECU software update after component replacement

Affected systems

Układ zapłonowyZarządzanie silnikiem (PCM/ECM)Układ paliwowyOkablowanie wysokiego napięcia

Related codes

P2300Wysoki

Niski poziom sygnału w obwodzie pierwotnym cewki zapłonowej 'A'. Sterownik silnika wykrył nieprawidłowe napięcie w obwodzie sterowania cewką zapłonową cylindra A.

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Does code P2305 require professional diagnostics?

The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.