Engine-Codes.com
Engine-Codes – GMC – P2312 2018 GMC Sierra

P2312 2018 GMC Sierra Code - Ignition Coil 5 Control Circuit Low Voltage

Quick Answer

The diagnostic trouble code (DTC) P2312 for a 2018 GMC Sierra specifically relates to the Ignition Coil 5 Control Circuit Low Voltage. Common causes include Faulty ignition coil, Damaged wiring or connectors in the control circuit, Malfunctioning engine control module (ECM). 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, Damaged wiring or connectors in the control circuit, Malfunctioning engine control module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P2312 2018 GMC Sierra Description

The diagnostic trouble code (DTC) P2312 for a 2018 GMC Sierra specifically relates to the Ignition Coil 5 Control Circuit Low Voltage. This code indicates that there is an issue with the electrical circuit controlling the ignition coil for cylinder 5 in the engine. The ignition coil is responsible for converting the low voltage from the battery into the high voltage needed to create a spark in the spark plugs, which in turn ignites the air-fuel mixture in the combustion chamber. When the control circuit for the ignition coil is experiencing low voltage, it can lead to misfires, rough idling, decreased fuel efficiency, and potentially even engine stalling.

OBDII Code P2312 2018 GMC Sierra - Ignition Coil 5 Control Circuit Low Voltage
P2312 2018 GMC Sierra Code - Ignition Coil 5 Control Circuit Low Voltage

Common Causes of P2312 2018 GMC Sierra

  1. Faulty ignition coil
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning engine control module (ECM)
  4. Battery or charging system issues
  5. Environmental factors such as moisture or corrosion

Symptoms of P2312 2018 GMC Sierra

  1. Engine misfires or rough idling
  2. Decreased fuel efficiency
  3. Illuminated check engine light
  4. Engine stalling or hesitation
  5. Lack of power or acceleration

How to Fix P2312 2018 GMC Sierra

  1. Begin by diagnosing the specific cause of the low voltage in the ignition coil control circuit using a scan tool to retrieve freeze frame data and live data.
  2. Inspect the ignition coil, wiring, and connectors for any visible damage or corrosion. Replace any components that are faulty.
  3. Test the battery and charging system to ensure they are providing the correct voltage to the ignition coil.
  4. Clear the trouble code from the ECM memory and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnostic procedures may be necessary to identify any underlying issues with the ECM or other related components.

Cost to Fix P2312 2018 GMC Sierra

The typical repair costs for addressing the Ignition Coil 5 Control Circuit Low Voltage issue can vary depending on the specific cause of the problem. In general, replacing a faulty ignition coil can cost between $100 and $300, while addressing wiring or connector issues may range from $50 to $150. Diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically falling between $80 and $150. It is advisable to consult with a trusted mechanic or dealership to obtain a more accurate estimate based on your vehicle's make and model, as well as the local labor rates in your area.

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.

Discuss the causes and fixes for P2312 2018 GMC Sierra OBDII Code

Submit a New Comment

Code P2312 2018 GMC Sierra comments

No comments found for this page.