AutoCodes – Chevrolet – P2318 2017 Chevrolet Silverado

P2318 2017 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 2017 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 276

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 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 2017 Chevrolet Silverado - Ignition Coil 7 Control Circuit Low Voltage - AutoCodes.com — P2318 2017 Chevrolet Silverado Code - Ignition Coil 7 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2318 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P2318 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 Chevrolet Silverado Code

1. What does the OBDII code P2318 mean for a 2017 Chevrolet Silverado?

P2318 indicates that there is a low voltage issue in the control circuit for ignition coil 7, which can affect the engine's performance.

2. What are the common symptoms of a P2318 code in a 2017 Chevrolet Silverado?

Symptoms may include engine misfires, rough idling, reduced power, poor fuel efficiency, and the illumination of the check engine light.

3. What causes the P2318 code in a 2017 Chevrolet Silverado?

Common causes include a faulty ignition coil, damaged wiring or connectors in the coil 7 circuit, a failing powertrain control module (PCM), or corroded electrical connections.

4. How do you diagnose the P2318 code in a 2017 Chevrolet Silverado?

Diagnosis involves inspecting the ignition coil 7 and its wiring for damage, checking for proper voltage supply, and using a scan tool to monitor the PCM and related sensor data.

5. Can a P2318 code cause engine damage if left unresolved?

Yes, prolonged misfires caused by this code can lead to engine damage, such as catalytic converter failure or increased wear on engine components.

6. How can you fix a P2318 code on a 2017 Chevrolet Silverado?

Repairs may include replacing the ignition coil for cylinder 7, repairing damaged wiring or connectors, cleaning corroded terminals, or, in rare cases, replacing the PCM if it is defective.

7. Is it safe to drive with a P2318 code on a 2017 Chevrolet Silverado?

It is not recommended to drive with this code, as misfires can reduce performance, increase emissions, and potentially cause engine damage over time.

8. How much does it cost to fix a P2318 code on a 2017 Chevrolet Silverado?

Repair costs can vary, but replacing an ignition coil typically costs $100-$300, while wiring repairs or PCM replacement can increase costs significantly.

9. Can a faulty spark plug cause the P2318 code in a 2017 Chevrolet Silverado?

Although unlikely, a faulty spark plug in cylinder 7 could indirectly contribute to misfires and should be inspected as part of the diagnostic process.

10. Will clearing the P2318 code without repairs fix the problem?

No, clearing the code without addressing the underlying issue will only temporarily turn off the check engine light, and the problem is likely to reoccur.