AutoCodes – GMC – P2318 2017 GMC Sierra

P2318 2017 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 2017 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 171

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 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 P2318 2017 GMC Sierra - Ignition Coil 7 Control Circuit Low Voltage - AutoCodes.com — P2318 2017 GMC Sierra Code - Ignition Coil 7 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2318 2017 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 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 P2318 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 P2318 2017 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 P2318 2017 GMC Sierra Code

1. What are common symptoms of OBDII code P2318 on a 2017 GMC Sierra related to Ignition Coil 7 Control Circuit Low Voltage?

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

2. What are the possible causes of OBDII code P2318 on a 2017 GMC Sierra?

- The code P2318 can be triggered by issues such as a faulty ignition coil, damaged wiring or connectors, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code P2318 on my 2017 GMC Sierra?

- To diagnose the issue, you can perform a visual inspection of the ignition coil and its connections, test the coil's resistance, check the wiring for damage, and scan the ECM for related error codes.

4. Can a bad spark plug cause OBDII code P2318 on a 2017 GMC Sierra?

- Yes, a faulty spark plug can cause misfires that may lead to the ignition coil control circuit registering low voltage and triggering code P2318.

5. What is the recommended repair for OBDII code P2318 on a 2017 GMC Sierra?

- The recommended repair involves inspecting and replacing the faulty ignition coil, repairing any damaged wiring or connectors, and clearing the error code from the ECM.

6. Is it safe to continue driving my 2017 GMC Sierra with OBDII code P2318 present?

- It is not recommended to drive the vehicle with code P2318 as it can lead to further engine damage and potential safety hazards. It's best to address the issue promptly.

7. Can I reset the Check Engine Light caused by OBDII code P2318 without fixing the underlying issue?

- While you can clear the code and reset the light temporarily, it will likely reappear if the root cause of the problem, such as a faulty ignition coil, is not addressed.

8. How much does it typically cost to repair OBDII code P2318 on a 2017 GMC Sierra?

- The cost of repairs for code P2318 can vary depending on the exact cause of the issue, but it may involve expenses for parts and labor ranging from $100 to $300 or more.

9. Are there any preventative maintenance tips to avoid OBDII code P2318 on a 2017 GMC Sierra in the future?

- To prevent code P2318, it's advisable to perform regular maintenance checks on the ignition system, including inspecting and replacing spark plugs and ignition coils according to the manufacturer's recommendations.

10. Can a DIY enthusiast repair OBDII code P2318 on a 2017 GMC Sierra, or is it best left to professionals?

- While some aspects of diagnosing and repairing code P2318 can be tackled by DIY enthusiasts with the necessary tools and knowledge, complex issues may require professional assistance to ensure proper resolution.