AutoCodes – Buick – P2315 Buick

P2315 Buick Code - Ignition Coil 6 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 6, Ignition Coil 6 harness is open or shorted, Ignition Coil 6 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: P2315 Buick indicates Ignition Coil 6 Control Circuit Low Voltage.
Common causes: Common causes include Faulty Ignition Coil 6, Ignition Coil 6 harness is open or shorted, Ignition Coil 6 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 673

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 Jul 31, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2315 Buick 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 P2315 Buick - Ignition Coil 6 Control Circuit Low Voltage - AutoCodes.com — P2315 Buick Code - Ignition Coil 6 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2315 Buick?

Faulty Ignition Coil 6
Ignition Coil 6 harness is open or shorted
Ignition Coil 6 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2315 Buick?

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 P2315 Buick 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.

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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 P2315 Buick Code

What does the OBDII code P2315 mean on a Buick?

P2315 indicates an issue with the ignition coil 6 control circuit, specifically that the voltage is lower than expected.

What are the common symptoms of code P2315 on a Buick?

Symptoms may include engine misfires, rough idling, reduced power, poor fuel economy, and a check engine light.

What causes the P2315 code on a Buick?

Common causes include a faulty ignition coil, damaged wiring or connectors for coil 6, a malfunctioning powertrain control module (PCM), or corroded electrical connections.

Can I drive my Buick with the P2315 code?

Driving with this code is not recommended, as it can cause engine misfires, which may lead to further engine damage or unsafe driving conditions.

How do I diagnose a P2315 code on my Buick?

Start by inspecting the ignition coil 6, checking for damaged wiring, corroded connectors, and testing the coil's resistance with a multimeter. Use a scan tool to monitor live data.

How can I fix the P2315 code on my Buick?

Repairs may include replacing the faulty ignition coil, repairing damaged wiring or connectors, cleaning corroded terminals, or reprogramming or replacing the PCM if necessary.

How much does it cost to fix the P2315 code on a Buick?

Repair costs vary but typically range from $100 to $300, depending on whether you need a new ignition coil, wiring repairs, or PCM reprogramming.

Can a bad spark plug cause the P2315 code?

While unlikely, a severely worn spark plug in cylinder 6 could indirectly contribute to ignition coil failure, so itâ€™s worth inspecting the spark plug as well.

Will clearing the code with a scan tool fix the P2315 issue?

Clearing the code will turn off the check engine light temporarily, but the issue will return unless the underlying problem is resolved.

How can I prevent the P2315 code on my Buick in the future?

Regular maintenance, including inspecting ignition components, replacing spark plugs as recommended, and keeping electrical connections clean, can help prevent this issue.