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Engine-Codes – GMC – P124B 2014 GMC Sierra

P124B 2014 GMC Sierra Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The P124B diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a short circuit between the positive voltage control circuit and the control circuit of injector 4. Common causes include Wiring harness damage or wear, Corrosion in the electrical connectors, Faulty fuel injector. 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
P124B 2014 GMC Sierra indicates Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes
Common causes include Wiring harness damage or wear, Corrosion in the electrical connectors, Faulty fuel injector.
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
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Code P124B 2014 GMC Sierra Description

The P124B diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a short circuit between the positive voltage control circuit and the control circuit of injector 4. In simpler terms, this means that there is an electrical issue in the wiring that controls the fuel injector for cylinder 4. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time to ensure proper engine performance.

OBDII Code P124B 2014 GMC Sierra - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit
P124B 2014 GMC Sierra Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit

Common Causes of P124B 2014 GMC Sierra

  1. Wiring harness damage or wear
  2. Corrosion in the electrical connectors
  3. Faulty fuel injector
  4. Issues with the Engine Control Module (ECM)
  5. Electrical short circuit

Symptoms of P124B 2014 GMC Sierra

  1. Engine misfires
  2. Rough idle
  3. Lack of power
  4. Poor fuel economy
  5. Difficulty starting

How to Fix P124B 2014 GMC Sierra

  1. Begin by conducting a visual inspection of the wiring harness and connectors to check for any visible damage or corrosion.
  2. Use a multimeter to test the continuity and resistance of the wiring to identify the location of the short circuit.
  3. Repair or replace any damaged wiring or connectors as necessary.
  4. Test the fuel injector and replace it if found to be faulty.
  5. Clear the DTC from the vehicle's ECM and perform a test drive to ensure the issue has been resolved.

Cost to Fix P124B 2014 GMC Sierra

The cost of repairing a P124B code on a 2014 GMC Sierra can vary depending on the extent of the damage and the specific parts that need to be replaced. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. It is important to note that labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate. Additionally, the cost may be higher if additional components need to be replaced or if the issue is more complex than initially anticipated.

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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 P124B 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P124B in a 2014 GMC Sierra related to Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit?

- Common symptoms include rough idling, engine misfires, poor acceleration, and potential engine stalling.

2. What are the possible causes of OBDII code P124B in a 2014 GMC Sierra?

- The code P124B can be triggered by issues such as damaged wiring, faulty fuel injector, corroded connectors, or a short circuit in the control circuit.

3. How can I diagnose the Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit issue in a 2014 GMC Sierra?

- To diagnose the problem, you can use a scan tool to read the OBDII code, visually inspect the wiring and connectors, perform continuity tests, and check the fuel injector for proper functioning.

4. Can I continue driving my 2014 GMC Sierra with OBDII code P124B related to Injector 4 issue?

- It is not recommended to drive the vehicle with this code as it may lead to further damage to the engine components. It is best to address the issue promptly.

5. How can I repair the Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit problem in my 2014 GMC Sierra?

- Repairing the issue involves fixing the damaged wiring, replacing the faulty fuel injector, cleaning or replacing corroded connectors, and ensuring there are no short circuits in the control circuit.

6. Is it possible to clear the OBDII code P124B in a 2014 GMC Sierra without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of the problem to prevent the code from reappearing and causing further issues.

7. Can a DIY enthusiast fix the Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit problem in a 2014 GMC Sierra?

- Depending on your skill level and experience with automotive repairs, you may be able to address the issue yourself by following repair guides and using the necessary tools.

8. How much does it typically cost to repair OBDII code P124B related to Injector 4 issue in a 2014 GMC Sierra?

- The cost of repairs can vary based on the extent of the damage and whether you do the repairs yourself or take the vehicle to a professional mechanic. It may range from a few hundred to over a thousand dollars.

9. Will fixing the Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit problem improve the performance of my 2014 GMC Sierra?

- Yes, addressing this issue can help restore the proper functioning of the fuel injector, leading to improved engine performance, fuel efficiency, and overall drivability of your vehicle.

10. How often does the OBDII code P124B related to Injector 4 issue occur in a 2014 GMC Sierra?

- While the occurrence of this specific code may vary, it is essential to address it promptly to prevent any potential damage to the engine and ensure the smooth operation of your vehicle.

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