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Engine-Codes – Generic – P2305

P2305 Code - Ignition Coil 'B' Secondary Circuit

Quick Answer

The P2305 diagnostic trouble code (DTC) indicates a malfunction in the ignition coil 'B' secondary circuit. Common causes include Faulty ignition coil 'B', Damaged ignition coil wiring or connectors, Issues with the engine control module (ECM). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2305 indicates Ignition Coil 'B' Secondary Circuit.
Common causes
Common causes include Faulty ignition coil 'B', Damaged ignition coil wiring or connectors, Issues with the engine control module (ECM).
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P2305 Description

The P2305 diagnostic trouble code (DTC) indicates a malfunction in the ignition coil 'B' secondary circuit. This code specifically points to an issue with the secondary winding of the ignition coil associated with cylinder 'B' in the engine. The ignition coil is a crucial component of the ignition system that converts the low voltage from the battery into the high voltage needed to create a spark in the spark plugs, which in turn ignites the air-fuel mixture in the engine cylinders.

OBDII Code P2305 - Ignition Coil 'B' Secondary Circuit
P2305 Code - Ignition Coil 'B' Secondary Circuit

Common Causes of P2305

  1. Faulty ignition coil 'B'
  2. Damaged ignition coil wiring or connectors
  3. Issues with the engine control module (ECM)
  4. Electrical shorts or open circuits in the ignition coil circuit
  5. Environmental factors such as moisture or corrosion

Symptoms of P2305

  1. Engine misfires
  2. Rough idling or vibrations
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Illuminated check engine light

How to Fix P2305

  1. Diagnose the issue by using a scan tool to verify the P2305 code and perform further testing to pinpoint the exact cause.
  2. Inspect the ignition coil 'B' and associated wiring for any visible damage or wear.
  3. Replace the faulty ignition coil 'B' if necessary, ensuring proper installation and connection.
  4. Clear the DTC and reset the ECM to see if the issue has been resolved.
  5. Test drive the vehicle to confirm that the symptoms have been resolved and there are no further issues.

Cost to Fix P2305

The typical repair costs for addressing the P2305 code can vary depending on the make and model of the vehicle, as well as the labor rates in different locations. On average, the cost of replacing an ignition coil can range from $100 to $300, including parts and labor. Additional diagnostic time may be required to pinpoint the exact cause of the issue, which can increase the overall cost. It's advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances.

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Code P2305 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2305 Code

No Frequently Asked Questions about P2305 Code found.

Discuss the causes and fixes for P2305 OBDII Code

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  • I still have this code coming up after putting in a new coil and plugs. Any other issues that could cause this?

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  • What model and year is your vehicle? have you try swapping the ignition coil with another cylinder? If coils are OK, then the next step is to check the wire from the ECM/PCM to ignition coil.

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  • 2006 Jeep Wrangler 4.0 motor. The coil is a huge coil pack so there's no checking it against other cylinders. We've tested the wires and all are good. Thoughts?

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  • According the service manual, the only other things that could cause that code, is the Automatic Shoutdown (ASD) Relay and the Powertrain Control Module (PCM)

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