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AutoCodes – GMC – P2312 2018 GMC Sierra

P2312 2018 GMC Sierra 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 2018 GMC Sierra 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 420
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 25, 2024
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Code P2312 2018 GMC Sierra 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 2018 GMC Sierra - Ignition Coil 5 Control Circuit Low Voltage - AutoCodes.com
P2312 2018 GMC Sierra Code - Ignition Coil 5 Control Circuit Low Voltage
What does this mean?

What are the Possible Causes of the DTC P2312 2018 GMC Sierra?

  • 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 2018 GMC Sierra?

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 2018 GMC Sierra 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 2018 GMC Sierra code?

Need more information on how to fix the P2312 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2312 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2018 GMC Sierra Code

1. What does the OBDII code P2312 mean on a 2018 GMC Sierra?

P2312 indicates a low voltage issue in the control circuit for Ignition Coil 5, which may affect engine performance.

2. What are the common symptoms of code P2312 in a 2018 GMC Sierra?

Symptoms may include rough idling, misfires, reduced engine power, poor fuel efficiency, and an illuminated check engine light.

3. What causes the P2312 code on a 2018 GMC Sierra?

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

4. Can you drive a 2018 GMC Sierra with the P2312 code?

Driving with this code is not recommended as it can lead to engine misfires, reduced performance, and potential damage to the catalytic converter.

5. How do you diagnose the P2312 code on a 2018 GMC Sierra?

Start by inspecting the wiring and connectors for damage, testing the Ignition Coil 5 for proper function, and checking the PCM for related issues.

6. How can you fix the P2312 code on a 2018 GMC Sierra?

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

7. How much does it cost to fix the P2312 code on a 2018 GMC Sierra?

Costs vary but can range from $150 to $400, depending on whether the ignition coil, wiring repairs, or PCM replacement is needed.

8. Can a bad spark plug cause the P2312 code on a 2018 GMC Sierra?

While unlikely, a bad spark plug can contribute to ignition issues and should be checked when diagnosing the problem.

9. What tools are needed to diagnose the P2312 code on a 2018 GMC Sierra?

You'll need an OBDII scanner, a multimeter to check voltage and continuity, and possibly an ignition coil tester.

10. Will clearing the P2312 code fix the issue on a 2018 GMC Sierra?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be repaired to prevent the code from returning.

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