P2302 — Ignition coil A secondary circuit — circuit fault

P2302 concerns ignition coil A secondary circuit. The monitor identifies a circuit problem without specifying a particular electrical failure mode. The secondary circuit is the side involved in producing the ignition output. A identifies the coil designation, not a universal cylinder number.

Affected system: Ignition-coil monitoring

Symptoms

• An engine warning may coincide with rough running or intermittent misfires, especially under acceleration.
• Uneven ignition can be accompanied by hesitation, reduced power or increased fuel use.

Possible causes

• Ignition coil A may be damaged, or its associated spark plug may be worn or fouled.
• A loose connector, corroded terminal or damaged ignition wiring can disturb the secondary circuit.

What to check

• Read companion misfire codes and locate coil A using the vehicle documentation rather than assuming a cylinder number.
• With the ignition off, inspect the relevant coil, connector and spark plug for visible defects.
• Use vehicle-specific ignition and wiring tests before deciding on replacement; avoid touching high-voltage components during operation.

Also written as: P2302-00, P230200 (some scan tools add the fault-type byte, e.g. -00).