AutoCodes – Buick – P2312 Buick

P2312 Buick Code - Ignition Coil 5 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 5, Ignition Coil 5 harness is open or shorted, Ignition Coil 5 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: P2312 Buick indicates Ignition Coil 5 Control Circuit Low Voltage.
Common causes: Common causes include Faulty Ignition Coil 5, Ignition Coil 5 harness is open or shorted, Ignition Coil 5 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 425

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 P2312 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 P2312 Buick - Ignition Coil 5 Control Circuit Low Voltage - AutoCodes.com — P2312 Buick Code - Ignition Coil 5 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2312 Buick?

Faulty Ignition Coil 5
Ignition Coil 5 harness is open or shorted
Ignition Coil 5 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2312 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 P2312 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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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 P2312 Buick Code

1. What does the OBDII code P2312 mean on a Buick?

P2312 indicates a low voltage issue in the control circuit for ignition coil 5. This can impact the coil's ability to generate proper spark for the associated cylinder.

2. What are the common symptoms of code P2312 in a Buick?

Symptoms may include engine misfires, rough idling, reduced fuel efficiency, hesitation during acceleration, and the check engine light being illuminated.

3. What causes the P2312 code to appear on a Buick?

Common causes include a faulty ignition coil, damaged wiring or connectors in the coil 5 control circuit, a malfunctioning ignition control module, or a failing powertrain control module (PCM).

4. Can I still drive my Buick with the P2312 code?

Itâ€™s not recommended to drive for an extended period with this code. Misfires caused by the issue can lead to engine damage, increased emissions, and poor performance.

5. How do I diagnose the P2312 code on my Buick?

Start by inspecting ignition coil 5 and its wiring for damage. Use a multimeter to check for proper voltage, continuity, and resistance in the circuit. If no issues are found, test the PCM and ignition control module.

6. How do I fix the P2312 code on a Buick?

Repairs may include replacing the faulty ignition coil, repairing damaged wiring or connectors, or replacing the ignition control module or PCM if they are found to be defective.

7. How much does it cost to repair the P2312 code on a Buick?

The repair cost can vary, but replacing an ignition coil typically ranges from $100 to $300, while fixing wiring issues or replacing a PCM can be more expensive based on labor and parts.

8. Can a bad spark plug cause the P2312 code in a Buick?

No, P2312 specifically relates to the control circuit of ignition coil 5, not the spark plug itself. However, a bad spark plug can cause related misfires, so itâ€™s good to check them as part of troubleshooting.

9. Will clearing the P2312 code fix the problem on my Buick?

Clearing the code without addressing the underlying issue will only temporarily remove the check engine light. The code will likely reappear if the problem persists.

10. Is it necessary to replace all ignition coils if P2312 is triggered on a Buick?

No, you only need to replace the faulty ignition coil (coil 5 in this case). However, if other coils show signs of wear or failure, it may be cost-effective to replace them as a set.