AutoCodes – GMC – P2306 GMC

P2306 GMC Code - Ignition Coil 3 Control Circuit Low Voltage

Quick Answer

The ignition system on this engine uses ignition coils with integrated power transistors. Common causes include Faulty Ignition Coil 3, Ignition Coil 3 harness is open or shorted, Ignition Coil 3 circuit poor electrical connection. 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: P2306 GMC indicates Ignition Coil 3 Control Circuit Low Voltage.
Common causes: Common causes include Faulty Ignition Coil 3, Ignition Coil 3 harness is open or shorted, Ignition Coil 3 circuit poor electrical connection.
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.

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Code Popularity 630

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 31, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2306 GMC Description

The ignition system on this engine uses ignition coils with integrated power transistors. The Engine Control Module (ECM) controls the spark event for each cylinder through individual ignition coil control circuits. When the ECM commands the ignition control circuit On, electrical current flows through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM commands the ignition control circuit Off, interrupting current flow through the primary winding. The collapsing magnetic field created by the primary winding induces a high voltage in the secondary winding, which is connected to the spark plugs. The Diagnostic Trouble Code (DTC) will be set when the control circuit commanded by the ECM state does not match the actual state.

OBDII Code P2306 GMC - Ignition Coil 3 Control Circuit Low Voltage - AutoCodes.com — P2306 GMC Code - Ignition Coil 3 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2306 GMC?

Faulty Ignition Coil 3
Ignition Coil 3 harness is open or shorted
Ignition Coil 3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2306 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2306 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2306 GMC code?

Need more information on how to fix the P2306 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2306 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P2306 2014 GMC Sierra — Ignition Coil 3 Control Circuit Low Voltage
P2306 2015 GMC Sierra — Ignition Coil 3 Control Circuit Low Voltage
P2306 2016 GMC Sierra — Ignition Coil 3 Control Circuit Low Voltage
P2306 2017 GMC Sierra — Ignition Coil 3 Control Circuit Low Voltage
P2306 2018 GMC Sierra — Ignition Coil 3 Control Circuit Low Voltage

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 P2306 GMC Code

1. What are the common symptoms of OBDII code P2306 GMC (Ignition Coil 3 Control Circuit Low Voltage)?

The common symptoms include rough idle, engine misfires, loss of power, and illuminated Check Engine Light.

2. What are the possible causes of OBDII code P2306 GMC?

Possible causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a problem with the Engine Control Module (ECM), or a weak electrical connection.

3. How can I diagnose the issue causing OBDII code P2306 GMC?

You can diagnose the issue by using a scan tool to read the code, visually inspecting the ignition coil and related wiring, testing the ignition coil for proper function, and checking the ECM for any faults.

4. Can I still drive my vehicle with OBDII code P2306 GMC present?

It is not recommended to drive your vehicle with this code present, as it can lead to further damage to the engine and other components. It is best to address the issue promptly.

5. How can I repair OBDII code P2306 GMC (Ignition Coil 3 Control Circuit Low Voltage)?

To repair this code, you may need to replace the faulty ignition coil, repair any damaged wiring or connectors, reset the ECM, and clear the code using a scan tool.

6. Are there any preventative maintenance tips to avoid OBDII code P2306 GMC?

Regularly checking and maintaining your ignition system, including the ignition coils and wiring, can help prevent issues that may trigger this code.

7. Can a DIY enthusiast fix OBDII code P2306 GMC?

If you have experience working on vehicles and access to the necessary tools and resources, you may be able to diagnose and repair this code yourself. However, if you are unsure, it's best to consult a professional mechanic.

8. How much does it typically cost to repair OBDII code P2306 GMC?

The cost of repairing this code can vary depending on the specific issue causing it, the labor rates in your area, and the cost of parts. It's best to get a few quotes from different mechanics to compare prices.

9. Will OBDII code P2306 GMC affect my vehicle's performance?

Yes, this code can affect your vehicle's performance by causing issues such as misfires, rough idle, and loss of power. It's important to address the problem promptly to avoid further damage.

10. Is it necessary to clear OBDII code P2306 GMC after repairing the issue?

Yes, it is important to clear the code using a scan tool after repairing the issue to reset the Check Engine Light and ensure that the problem has been resolved.