AutoCodes – Chevrolet – P2318 2018 Chevrolet Silverado

P2318 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 397

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Ignition Coil 7 Control Circuit Low Voltage - AutoCodes.com — P2318 2018 Chevrolet Silverado Code - Ignition Coil 7 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2318 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P2318 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What does the OBDII code P2318 mean on a 2018 Chevrolet Silverado?

The P2318 code indicates an "Ignition Coil 7 Control Circuit Low Voltage," meaning the ECM is detecting an issue with the electrical signal to ignition coil 7.

2. What are the common symptoms of code P2318 in a 2018 Chevrolet Silverado?

Symptoms may include engine misfires, rough idling, reduced power, poor fuel economy, and the Check Engine Light being illuminated.

3. What causes the P2318 code to appear on a 2018 Chevrolet Silverado?

Common causes include a faulty ignition coil, damaged or corroded wiring or connectors, a defective ECM, or an issue with the coil circuit ground.

4. Can I drive my 2018 Chevrolet Silverado with the P2318 code?

Itâ€™s not recommended to drive with this code, as it can cause further damage to the engine or catalytic converter if the misfiring continues.

5. How do you diagnose code P2318 on a 2018 Chevrolet Silverado?

Diagnosis typically involves scanning for additional codes, checking the ignition coil 7 and its wiring for damage, testing the coil with a multimeter, and verifying proper voltage and grounding.

6. How can I fix the P2318 code on a 2018 Chevrolet Silverado?

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

7. How much does it cost to fix the P2318 code on a 2018 Chevrolet Silverado?

The repair cost depends on the issue, ranging from $100-$300 for ignition coil replacement to higher amounts if the ECM or extensive wiring repair is necessary.

8. Can a bad spark plug cause the P2318 code on a 2018 Chevrolet Silverado?

While rare, a faulty spark plug can lead to misfires that indirectly contribute to ignition coil issues, so itâ€™s worth inspecting the spark plug for cylinder 7.

9. How can I prevent the P2318 code from occurring again?

Regular maintenance like inspecting ignition components, replacing spark plugs as recommended, and ensuring wiring is free of corrosion or damage can help prevent this code.

10. Is a professional mechanic required to fix the P2318 code on a 2018 Chevrolet Silverado?

While experienced DIYers may be able to handle ignition coil or wiring repairs, consulting a professional is recommended for accurate diagnostics and complex repairs.