AutoCodes – GMC – P2309 2015 GMC Sierra

P2309 2015 GMC Sierra Code - Ignition Coil 4 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 4, Ignition Coil 4 harness is open or shorted, Ignition Coil 4 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: P2309 2015 GMC Sierra indicates Ignition Coil 4 Control Circuit Low Voltage.
Common causes: Common causes include Faulty Ignition Coil 4, Ignition Coil 4 harness is open or shorted, Ignition Coil 4 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 163

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 P2309 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 P2309 2015 GMC Sierra - Ignition Coil 4 Control Circuit Low Voltage - AutoCodes.com — P2309 2015 GMC Sierra Code - Ignition Coil 4 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2309 2015 GMC Sierra?

Faulty Ignition Coil 4
Ignition Coil 4 harness is open or shorted
Ignition Coil 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2309 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 P2309 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 P2309 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 P2309 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P2309 in a 2015 GMC Sierra related to Ignition Coil 4 Control Circuit Low Voltage?

- Common symptoms include engine misfires, rough idling, loss of power, and illuminated Check Engine Light.

2. What are the possible causes of OBDII code P2309 in a 2015 GMC Sierra indicating Ignition Coil 4 Control Circuit Low Voltage?

- Possible causes may include a faulty ignition coil, damaged wiring or connectors, a defective PCM (powertrain control module), or a poor electrical connection.

3. How can I diagnose the issue causing OBDII code P2309 in my 2015 GMC Sierra related to Ignition Coil 4 Control Circuit Low Voltage?

- You can diagnose the problem by visually inspecting the ignition coil and its wiring, checking for loose connections, performing a continuity test on the wiring, and using a scan tool to monitor the coil's operation.

4. Can I continue driving my 2015 GMC Sierra with OBDII code P2309 related to Ignition Coil 4 Control Circuit Low Voltage?

- It is not recommended to drive the vehicle with this code 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 P2309 in my 2015 GMC Sierra indicating Ignition Coil 4 Control Circuit Low Voltage?

- Repair options may include replacing the faulty ignition coil, repairing or replacing damaged wiring, ensuring proper connections, and clearing the trouble code with a scan tool.

6. Is it possible to reset OBDII code P2309 in a 2015 GMC Sierra related to Ignition Coil 4 Control Circuit Low Voltage without fixing the underlying issue?

- While you can clear the trouble code temporarily with a scan tool, it is important to address the root cause of the problem to prevent the code from recurring.

7. How much does it typically cost to repair OBDII code P2309 in a 2015 GMC Sierra indicating Ignition Coil 4 Control Circuit Low Voltage?

- The cost of repair can vary depending on the specific issue, but it may involve parts and labor expenses ranging from $100 to $300 or more.

8. Will OBDII code P2309 in a 2015 GMC Sierra cause permanent damage if left untreated?

- Ignoring the issue indicated by this code can potentially lead to more severe engine problems over time, so it is advisable to address it promptly to prevent further damage.

9. Can extreme weather conditions affect the likelihood of triggering OBDII code P2309 in a 2015 GMC Sierra related to Ignition Coil 4 Control Circuit Low Voltage?

- Extreme weather conditions, such as excessive heat or moisture, can sometimes exacerbate electrical issues that may trigger this code, so it's essential to keep the vehicle well maintained in all conditions.

10. Are there any preventative maintenance steps I can take to reduce the risk of OBDII code P2309 in my 2015 GMC Sierra related to Ignition Coil 4 Control Circuit Low Voltage?

- Regularly inspecting and maintaining the ignition system components, ensuring proper grounding, and promptly addressing any warning signs can help prevent issues that may lead to this code.