AutoCodes – GMC – P2312 GMC

P2312 GMC 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 GMC 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 705

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

What does this mean?

What are the Possible Causes of the DTC P2312 GMC?

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 GMC?

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 GMC 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 P2312 GMC code?

Need more information on how to fix the P2312 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2312 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P2312 2014 GMC Sierra — Ignition Coil 5 Control Circuit Low Voltage
P2312 2015 GMC Sierra — Ignition Coil 5 Control Circuit Low Voltage
P2312 2016 GMC Sierra — Ignition Coil 5 Control Circuit Low Voltage
P2312 2017 GMC Sierra — Ignition Coil 5 Control Circuit Low Voltage
P2312 2018 GMC Sierra — Ignition Coil 5 Control Circuit Low Voltage

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 GMC Code

1. What are the common symptoms of OBDII code P2312 GMC (Ignition Coil 5 Control Circuit Low Voltage)?

- Common symptoms include engine misfires, rough idling, poor acceleration, and potentially a decrease in fuel efficiency.

2. What are some possible causes of OBDII code P2312 GMC?

- Possible causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a failed PCM, or a weak battery.

3. How can I diagnose the issue related to OBDII code P2312 GMC?

- Diagnose the issue by visually inspecting the ignition coil and its connections, checking for damaged wires, using a multimeter to test the voltage at the ignition coil, and performing a comprehensive scan tool diagnostic.

4. Can I still drive my vehicle with OBDII code P2312 GMC present?

- It is not recommended to drive your vehicle with this code present, as it can lead to further damage to the engine and other components. It is best to address the issue promptly.

5. How can I repair OBDII code P2312 GMC (Ignition Coil 5 Control Circuit Low Voltage)?

- Repair options include replacing the faulty ignition coil, repairing any damaged wiring or connectors, resetting the PCM, or replacing the PCM if necessary.

6. Will resetting the OBDII code P2312 GMC clear the issue permanently?

- Resetting the code may temporarily clear the issue, but if the underlying cause is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

7. What are some tips for preventing OBDII code P2312 GMC from occurring?

- Regularly inspect and maintain your vehicle's ignition system, ensure all electrical connections are secure, use high-quality ignition coils, and address any engine performance issues promptly.

8. Can a DIY enthusiast fix OBDII code P2312 GMC, or should I seek professional help?

- Depending on your skill level and experience with automotive repairs, you may be able to fix this issue yourself. However, if you are unsure or uncomfortable with the diagnostic and repair process, it is best to seek professional help.

9. Is it necessary to replace all ignition coils if OBDII code P2312 GMC is related to one specific coil?

- It is not necessary to replace all ignition coils if the issue is isolated to one specific coil. However, it is recommended to inspect the other coils for any signs of wear or damage while addressing the primary issue.

10. How long does it typically take to repair OBDII code P2312 GMC?

- The repair time can vary depending on the specific cause of the code and the complexity of the repair. It may take anywhere from a few hours to a full day to diagnose and fix the issue.