AutoCodes – GMC – P2318 2015 GMC Sierra

P2318 2015 GMC Sierra Code - Ignition Coil 7 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 7, Ignition Coil 7 harness is open or shorted, Ignition Coil 7 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: P2318 2015 GMC Sierra indicates Ignition Coil 7 Control Circuit Low Voltage.
Common causes: Common causes include Faulty Ignition Coil 7, Ignition Coil 7 harness is open or shorted, Ignition Coil 7 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 271

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 P2318 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 P2318 2015 GMC Sierra - Ignition Coil 7 Control Circuit Low Voltage - AutoCodes.com — P2318 2015 GMC Sierra Code - Ignition Coil 7 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2318 2015 GMC Sierra?

Faulty Ignition Coil 7
Ignition Coil 7 harness is open or shorted
Ignition Coil 7 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2318 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 P2318 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 P2318 2015 GMC Sierra code?

Need more information on how to fix the P2318 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P2318 2015 GMC Sierra Code

1. What are common symptoms of OBDII code P2318 in a 2015 GMC Sierra?

- Common symptoms include engine misfires, rough idling, poor acceleration, and potential engine stalling.

2. What causes the OBDII code P2318 in a 2015 GMC Sierra?

- This code is typically triggered by a malfunction in the ignition coil 7 control circuit, leading to low voltage readings.

3. How can I diagnose the issue related to OBDII code P2318 in my 2015 GMC Sierra?

- Diagnosing the problem involves checking the wiring and connections related to ignition coil 7, testing the ignition coil itself, and inspecting for any damage or corrosion.

4. Can a faulty spark plug cause OBDII code P2318 in a 2015 GMC Sierra?

- While a faulty spark plug can contribute to ignition issues, OBDII code P2318 specifically relates to the control circuit and voltage of ignition coil 7.

5. What are the repair options for fixing OBDII code P2318 in a 2015 GMC Sierra?

- Repair options may include replacing the ignition coil 7, repairing any damaged wiring or connections, and resetting the trouble code with a diagnostic tool.

6. Is it safe to continue driving with OBDII code P2318 illuminated in a 2015 GMC Sierra?

- It is not recommended to drive with this code active, as it can lead to further engine performance issues and potential damage if left unresolved.

7. Can a DIY enthusiast fix OBDII code P2318 in a 2015 GMC Sierra?

- Depending on the individual's skill level, a DIY enthusiast may be able to address the issue by following repair guides and using the necessary tools.

8. How much does it typically cost to repair OBDII code P2318 in a 2015 GMC Sierra at a professional mechanic or dealership?

- Repair costs can vary but may include parts and labor, with an estimated range of $150 to $300 for addressing the ignition coil 7 control circuit low voltage issue.

9. Will resetting the OBDII code P2318 in a 2015 GMC Sierra make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not fixed, the code is likely to reappear once the problem is detected again.

10. How can I prevent OBDII code P2318 from reoccurring in my 2015 GMC Sierra?

- Regular maintenance, such as checking and replacing ignition components as needed, keeping up with tune-ups, and addressing any engine performance issues promptly, can help prevent the reoccurrence of this code.