AutoCodes – GMC – P2304 2015 GMC Sierra

P2304 2015 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 2015 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 246

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 2015 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 2015 GMC Sierra - Ignition Coil 2 Control Circuit High Voltage - AutoCodes.com — P2304 2015 GMC Sierra Code - Ignition Coil 2 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2304 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P2304 in a 2015 GMC Sierra related to Ignition Coil 2 Control Circuit High Voltage?

- Common symptoms include engine misfires, rough idling, loss of power, and potential stalling.

2. What are the potential causes of OBDII code P2304 in a 2015 GMC Sierra?

- The code P2304 can be triggered by issues such as a faulty ignition coil, damaged wiring or connectors, a problem with the ignition coil driver circuit, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the cause of OBDII code P2304 in my 2015 GMC Sierra?

- Diagnosis typically involves inspecting the ignition coil and related components for damage, testing the wiring and connectors for continuity and proper voltage, and using a scan tool to check the PCM for any related trouble codes.

4. Can I continue to drive my 2015 GMC Sierra with OBDII code P2304 present?

- It is not recommended to drive your vehicle with code P2304 unresolved, as it can lead to further damage to the engine and potentially cause safety hazards.

5. How can I repair OBDII code P2304 related to Ignition Coil 2 Control Circuit High Voltage in my 2015 GMC Sierra?

- Repair options may include replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, addressing any issues with the ignition coil driver circuit, or reprogramming the PCM if necessary.

6. Is it possible to reset OBDII code P2304 in a 2015 GMC Sierra without fixing the underlying issue?

- While clearing the code may temporarily turn off the Check Engine Light, the underlying problem causing the code will persist and likely trigger the code again in the future.

7. Can a DIY enthusiast fix OBDII code P2304 in a 2015 GMC Sierra?

- Depending on your skill level and access to tools, you may be able to address some of the common causes of P2304, such as replacing the ignition coil or repairing simple wiring issues. However, more complex diagnostics and repairs may require professional assistance.

8. How long does it typically take to repair OBDII code P2304 in a 2015 GMC Sierra?

- The repair time can vary depending on the specific cause of the code, but simple fixes like replacing an ignition coil can usually be done within an hour or two, while more involved repairs may take longer.

9. Are there any preventative maintenance measures to avoid OBDII code P2304 in a 2015 GMC Sierra?

- Regularly inspecting and maintaining the ignition system components, such as the ignition coils, spark plugs, and wiring, can help prevent issues that may lead to code P2304.

10. Will fixing OBDII code P2304 improve the performance and fuel efficiency of my 2015 GMC Sierra?

- Yes, addressing code P2304 and ensuring the ignition system is functioning properly can help improve engine performance, fuel efficiency, and overall drivability of your vehicle.