AutoCodes – GMC – P2318 2016 GMC Sierra

P2318 2016 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 2016 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 175

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 2016 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 2016 GMC Sierra - Ignition Coil 7 Control Circuit Low Voltage - AutoCodes.com — P2318 2016 GMC Sierra Code - Ignition Coil 7 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2318 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What does the OBDII code P2318 mean on a 2016 GMC Sierra?

P2318 indicates a low voltage issue in the ignition coil 7 control circuit, which may affect the performance of cylinder 7.

2. What are the symptoms of code P2318 on a 2016 GMC Sierra?

Common symptoms include engine misfires, rough idling, reduced fuel efficiency, and possibly the check engine light illuminating.

3. What causes the P2318 code to appear in a 2016 GMC Sierra?

Possible causes include a faulty ignition coil, defective wiring or connectors in the ignition circuit, a bad spark plug, or a malfunctioning ECM/PCM.

4. How do I diagnose the P2318 code on my GMC Sierra?

Diagnosis involves inspecting the wiring and connectors for damage, testing the ignition coil on cylinder 7, checking the spark plug, and verifying the output from the ECM/PCM.

5. Can I drive my 2016 GMC Sierra with the P2318 code active?

Itâ€™s not recommended to drive with this code active, as it can lead to further engine damage and reduced performance due to misfires.

6. How do I fix the P2318 code on a 2016 GMC Sierra?

Repairs may include replacing the ignition coil, repairing damaged wiring or connectors, replacing the spark plug, or reprogramming or replacing the ECM/PCM if necessary.

7. How much does it cost to repair the P2318 code on a GMC Sierra?

The cost varies depending on the repair. Replacing an ignition coil typically costs $100-$200, while more complex issues, such as ECM replacement, can exceed $500.

8. Can a dirty or faulty spark plug cause the P2318 code?

Yes, a dirty or faulty spark plug can cause ignition coil issues, potentially triggering the P2318 code.

9. What tools do I need to troubleshoot the P2318 code on my GMC Sierra?

You'll need an OBDII scanner, a multimeter for testing voltage, and possibly tools to remove the ignition coil and spark plug for inspection.

10. Is the P2318 code a common issue for the 2016 GMC Sierra?

While not extremely common, ignition coil circuit issues like P2318 can occur, especially as the vehicle ages or with wear on ignition system components.