P2305 Fault Code

Ignition Coil B Secondary Circuit

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2305 fault code indicates an issue with the Ignition Coil B Secondary Circuit. This code may be triggered when the Engine Control Module (ECM) detects a problem in the electrical circuit of the ignition coil responsible for firing the engine's cylinders.

• Ignition Coil Function: Responsible for stepping up voltage from the battery to create a spark in the spark plugs.
• Secondary Circuit: Refers to the circuitry after the ignition coil's primary winding that includes the various components involved in distributing the spark to the cylinders.

What are the symptoms of the P2305 code?

When the P2305 code is present, you may experience symptoms such as:

• Engine misfires, particularly on the cylinder associated with Ignition Coil B
• Difficulty starting the engine
• Decreased engine performance and acceleration
• Check Engine Light (CEL) illumination
• Rough idling or stalling can also occur depending on the severity

What causes the P2305 code?

Several factors can contribute to the P2305 code, including:

• Damaged or faulty ignition coil B
• Poor electrical connections or corroded wiring within the ignition circuit
• Faulty ignition coil driver in the ECM
• Short or open circuit conditions
• Issues with the spark plugs or related components

How to fix P2305?

To resolve the P2305 code, follow these steps:

• Initial Diagnosis: Use an OBD-II scanner to confirm the fault code and check for any additional related codes.
• Inspect Wiring and Connectors: Check the wiring and connectors leading to Ignition Coil B for any signs of damage or corrosion. Repair or replace as necessary.
• Test Ignition Coil B: Use a multimeter to test the resistance and functionality of the ignition coil. If it is defective, replace it.
• Check ECM: If all else is functioning well, inspect the engine control module for faults, as it may have a defective ignition coil driver.
• Clear Codes and Test Drive: After repairs, clear the fault codes and take the vehicle for a test drive to ensure the issue is resolved.