AutoCodes – GMC – P2309 2017 GMC Sierra

P2309 2017 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 2017 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 194

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2309 2017 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 2017 GMC Sierra - Ignition Coil 4 Control Circuit Low Voltage - AutoCodes.com — P2309 2017 GMC Sierra Code - Ignition Coil 4 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2309 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the P2309 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2309 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2017 GMC Sierra Code

1. What does the OBDII code P2309 mean on a 2017 GMC Sierra?

P2309 indicates a problem with the ignition coil 4 control circuit, specifically low voltage detected by the engine control module (ECM).

2. What are the symptoms of code P2309 in a 2017 GMC Sierra?

Symptoms may include engine misfires, rough idling, reduced power, poor fuel economy, and the check engine light being illuminated.

3. What causes the P2309 code to appear on a 2017 GMC Sierra?

Common causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a malfunctioning ECM, or corrosion at electrical connections.

4. Can I drive my 2017 GMC Sierra with the P2309 code?

Driving with this code can lead to engine misfires and potential damage to the catalytic converter. Itâ€™s best to address the issue as soon as possible.

5. How do I diagnose the P2309 code on my 2017 GMC Sierra?

Start by inspecting the ignition coil 4, its wiring, and connectors. Use a multimeter to check for proper voltage and continuity in the ignition coil control circuit.

6. How do I fix the P2309 code on a 2017 GMC Sierra?

Repairs may include replacing the faulty ignition coil, repairing damaged wiring or connectors, cleaning corroded terminals, or in rare cases, replacing the ECM.

7. How much does it cost to fix a P2309 code on a 2017 GMC Sierra?

The cost depends on the repair. Replacing an ignition coil typically costs $100-$300, while addressing wiring issues or ECM replacement can vary significantly.

8. Can a bad spark plug cause the P2309 code on my 2017 GMC Sierra?

A bad spark plug itself may not trigger P2309, but it can cause misfires that stress the ignition coil, potentially leading to circuit issues.

9. Will clearing the P2309 code fix the problem in my 2017 GMC Sierra?

Clearing the code may temporarily turn off the check engine light, but it wonâ€™t resolve the underlying issue. Proper diagnosis and repair are necessary.

10. How can I prevent the P2309 code from recurring on my 2017 GMC Sierra?

Regular maintenance, including inspecting ignition components, checking for corroded connections, and replacing worn parts, can help prevent this issue.