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Engine-Codes – GMC – P2306 2018 GMC Sierra

P2306 2018 GMC Sierra Code - Ignition Coil 3 Control Circuit Low Voltage

Quick Answer

The P2306 diagnostic trouble code (DTC) specifically relates to the ignition coil 3 control circuit having low voltage in a 2018 GMC Sierra. Common causes include Faulty ignition coil for cylinder 3, Damaged wiring or connectors in the ignition coil circuit, Failed engine control module (ECM). 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 2018 GMC Sierra indicates Ignition Coil 3 Control Circuit Low Voltage.
Common causes
Common causes include Faulty ignition coil for cylinder 3, Damaged wiring or connectors in the ignition coil circuit, Failed engine control module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P2306 2018 GMC Sierra Description

The P2306 diagnostic trouble code (DTC) specifically relates to the ignition coil 3 control circuit having low voltage in a 2018 GMC Sierra. This code indicates that there is an issue with the electrical circuit responsible for controlling the ignition coil for cylinder 3, which can result in a lack of proper spark being generated for combustion in that cylinder. Ignition coils play a crucial role in the ignition system of a vehicle, as they are responsible for converting the low voltage power from the battery into the high voltage needed to create a spark at the spark plugs. In this case, a low voltage signal is being detected by the engine control module (ECM), indicating a problem with the ignition coil's operation.

OBDII Code P2306 2018 GMC Sierra - Ignition Coil 3 Control Circuit Low Voltage
P2306 2018 GMC Sierra Code - Ignition Coil 3 Control Circuit Low Voltage

Common Causes of P2306 2018 GMC Sierra

  1. Faulty ignition coil for cylinder 3.
  2. Damaged wiring or connectors in the ignition coil circuit.
  3. Failed engine control module (ECM).
  4. Poor power supply to the ignition coil.
  5. Environmental factors such as moisture or corrosion affecting the circuit.

Symptoms of P2306 2018 GMC Sierra

  1. Engine misfires or hesitation during acceleration.
  2. Rough idling or vibrations while the engine is running.
  3. Decreased fuel efficiency and power.
  4. Check engine light illuminated on the dashboard.
  5. Engine stalling or difficulty starting the vehicle.

How to Fix P2306 2018 GMC Sierra

  1. Start by diagnosing the specific cause of the low voltage issue, using a scan tool to retrieve the DTC and checking the ignition coil, wiring, connectors, and ECM for any visible damage or faults.
  2. Replace the faulty ignition coil for cylinder 3 if it is determined to be the source of the problem.
  3. Inspect and repair any damaged wiring or connectors in the ignition coil circuit, ensuring a secure connection.
  4. Test the power supply to the ignition coil and address any issues with voltage levels or continuity.
  5. Clear the DTC from the ECM memory and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P2306 2018 GMC Sierra

The typical repair costs for addressing a P2306 code on a 2018 GMC Sierra can range from $150 to $300, including parts and labor. However, it's essential to note that the actual costs can vary based on factors such as the location of the repair shop, the specific make and model of the vehicle, and the type of engine being worked on. Diagnostic time and labor rates at auto repair shops typically range from $80 to $150 per hour, with rates potentially higher at dealerships or in metropolitan areas and lower at independent shops. It's advisable to obtain a detailed estimate from a local repair shop to get a more accurate cost projection for this particular issue.

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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 P2306 2018 GMC Sierra Code

1. What are common symptoms of OBDII code P2306 in a 2018 GMC Sierra related to Ignition Coil 3 Control Circuit Low Voltage?

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

2. What are the possible causes of OBDII code P2306 in a 2018 GMC Sierra?

- The code P2306 may indicate issues such as a faulty ignition coil, damaged wiring or connectors, a defective PCM, or a problem with the spark plug.

3. How can I diagnose the source of OBDII code P2306 in my 2018 GMC Sierra?

- To diagnose the issue, you can perform a visual inspection of the ignition coil and related components, check the wiring for any damage, test the coil's resistance, and use a scan tool to monitor live data while the engine is running.

4. Can driving with OBDII code P2306 in a 2018 GMC Sierra cause further damage?

- Continuing to drive with the code P2306 can potentially lead to permanent damage to the ignition system, reduced fuel efficiency, and further engine performance issues.

5. Is it safe to continue driving my 2018 GMC Sierra with OBDII code P2306 related to Ignition Coil 3 Control Circuit Low Voltage?

- It is not recommended to drive the vehicle with this code active, as it can lead to poor engine performance and potentially leave you stranded.

6. How can I repair OBDII code P2306 in my 2018 GMC Sierra related to Ignition Coil 3 Control Circuit Low Voltage?

- Repair options include replacing the faulty ignition coil, repairing or replacing damaged wiring, ensuring proper connections, and resetting the trouble code with a scan tool after the repair is completed.

7. Can I reset OBDII code P2306 in my 2018 GMC Sierra without fixing the underlying issue?

- While you can clear the trouble code with a scan tool, it is crucial to address the underlying problem causing the code to prevent further issues.

8. How much does it typically cost to fix OBDII code P2306 in a 2018 GMC Sierra at a repair shop?

- The cost of repairing OBDII code P2306 can vary depending on the specific issue, but it may range from $100 to $300 or more, including parts and labor.

9. Are there any preventive maintenance measures I can take to avoid OBDII code P2306 in my 2018 GMC Sierra?

- Regularly inspecting and maintaining the ignition system, including checking the condition of spark plugs and ignition coils, can help prevent issues that trigger code P2306.

10. Will disconnecting the battery reset OBDII code P2306 in a 2018 GMC Sierra?

- Disconnecting the battery may clear the code temporarily, but it is recommended to address the root cause of the issue to prevent the code from reappearing.

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