AutoCodes – GMC – P2304 2014 GMC Sierra

P2304 2014 GMC Sierra Code - Ignition Coil 2 Control Circuit High Voltage

Quick Answer

The ignition system on this engine uses ignition coils with integrated power transistors. Common causes include Faulty Ignition Coil 2, Ignition Coil 2 harness is open or shorted, Ignition Coil 2 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: P2304 2014 GMC Sierra indicates Ignition Coil 2 Control Circuit High Voltage.
Common causes: Common causes include Faulty Ignition Coil 2, Ignition Coil 2 harness is open or shorted, Ignition Coil 2 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 149

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 Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2304 2014 GMC Sierra 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 P2304 2014 GMC Sierra - Ignition Coil 2 Control Circuit High Voltage - AutoCodes.com — P2304 2014 GMC Sierra Code - Ignition Coil 2 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2304 2014 GMC Sierra?

Faulty Ignition Coil 2
Ignition Coil 2 harness is open or shorted
Ignition Coil 2 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2304 2014 GMC Sierra?

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 P2304 2014 GMC Sierra 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 P2304 2014 GMC Sierra code?

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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 P2304 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P2304 in a 2014 GMC Sierra?

- Common symptoms include engine misfires, rough idle, decreased fuel efficiency, and potentially stalling of the vehicle.

2. What causes the OBDII code P2304 (Ignition Coil 2 Control Circuit High Voltage) in a 2014 GMC Sierra?

- The code is typically triggered by issues with the ignition coil, such as a faulty coil, damaged wiring, or a poor connection.

3. How can I diagnose the cause of OBDII code P2304 in my 2014 GMC Sierra?

- You can use a multimeter to test the ignition coil, check for damaged wiring or loose connections, and inspect the coil's connector for signs of corrosion.

4. Can a bad spark plug cause OBDII code P2304 to appear in a 2014 GMC Sierra?

- Yes, a bad spark plug can cause issues with the ignition system, potentially triggering this code. It's recommended to check and replace spark plugs if necessary.

5. Is it safe to continue driving with OBDII code P2304 present in my 2014 GMC Sierra?

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

6. How can I reset OBDII code P2304 in my 2014 GMC Sierra?

- You can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes. However, the underlying issue should still be addressed.

7. Can a DIY enthusiast repair OBDII code P2304 in a 2014 GMC Sierra?

- Some simple repairs, such as replacing the ignition coil or fixing a loose connection, can be done by a DIY enthusiast. However, more complex issues may require professional help.

8. Will OBDII code P2304 cause permanent damage to my 2014 GMC Sierra if left unresolved?

- Ignoring this code can lead to potential damage to the engine, catalytic converter, or other components over time, so it's best to address the issue promptly.

9. How much does it typically cost to repair OBDII code P2304 in a 2014 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

10. Are there any preventive measures to avoid OBDII code P2304 in a 2014 GMC Sierra?

- Regular maintenance, such as checking and replacing spark plugs, inspecting ignition components, and addressing any warning signs promptly, can help prevent this code from appearing.