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Engine-Codes – GMC – P124C 2014 GMC Sierra

P124C 2014 GMC Sierra Code - Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The diagnostic trouble code P124C for a 2014 GMC Sierra indicates that there is a problem with the Injector 5 Positive Voltage Control Circuit being shorted to the Control Circuit. Common causes include Damaged wiring or connectors in the Injector 5 Positive Voltage Control Circuit, Faulty fuel injector for cylinder number 5, 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
P124C 2014 GMC Sierra indicates Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes
Common causes include Damaged wiring or connectors in the Injector 5 Positive Voltage Control Circuit, Faulty fuel injector for cylinder number 5, 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
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Code P124C 2014 GMC Sierra Description

The diagnostic trouble code P124C for a 2014 GMC Sierra indicates that there is a problem with the Injector 5 Positive Voltage Control Circuit being shorted to the Control Circuit. In simpler terms, this means that there is an issue with the electrical circuit that controls the fuel injector for cylinder number 5 in the engine. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber for efficient combustion. When this circuit is shorted, it can lead to a variety of performance issues in the vehicle.

OBDII Code P124C 2014 GMC Sierra - Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit
P124C 2014 GMC Sierra Code - Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit

Common Causes of P124C 2014 GMC Sierra

  1. Damaged wiring or connectors in the Injector 5 Positive Voltage Control Circuit
  2. Faulty fuel injector for cylinder number 5
  3. Malfunctioning Engine Control Module (ECM)
  4. Short circuit caused by water intrusion or corrosion
  5. Electrical issues such as a blown fuse or relay in the circuit

Symptoms of P124C 2014 GMC Sierra

  1. Engine misfires
  2. Rough idling
  3. Decreased fuel efficiency
  4. Poor acceleration
  5. Stalling

How to Fix P124C 2014 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring and connectors in the Injector 5 Positive Voltage Control Circuit to identify any damage or corrosion.
  2. Test the fuel injector for cylinder number 5 to determine if it is functioning correctly. Replace the injector if necessary.
  3. Check the Engine Control Module (ECM) for any faults or errors. Repair or replace the ECM as needed.
  4. Clear the diagnostic trouble codes from the vehicle's computer using a scan tool and test drive the vehicle to ensure that the issue has been resolved.
  5. If the problem persists, consult a professional mechanic for further diagnosis and repair.

Cost to Fix P124C 2014 GMC Sierra

The typical repair costs for addressing a P124C code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new fuel injector or Engine Control Module (ECM) can range from $200 to $800. Labor costs at an auto repair shop can add an additional $100 to $300 to the total bill. Overall, the total repair costs for this issue may range from $300 to $1100. It is important to note that these estimates are rough averages, and actual costs may vary based on factors such as location, vehicle make and model, and the extent of the repairs needed. It is recommended to obtain quotes from local auto repair shops for a more accurate cost estimate.

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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 P124C 2014 GMC Sierra Code

1. What does the OBDII code P124C mean on a 2014 GMC Sierra?

P124C indicates an issue with the Injector 5 Positive Voltage Control Circuit being shorted to the control circuit, which affects the operation of injector 5.

2. What are the common symptoms of the P124C code?

Symptoms may include rough idling, misfires, reduced engine performance, poor fuel economy, and the check engine light being illuminated.

3. What causes the P124C code to appear?

Common causes include damaged wiring or connectors for injector 5, a failed fuel injector, a short circuit in the injector wiring harness, or a faulty engine control module (ECM).

4. Can I drive my 2014 GMC Sierra with a P124C code?

Driving with a P124C code is not recommended, as it can lead to further engine damage, reduced performance, and potential safety issues.

5. How do I diagnose the P124C code on my 2014 GMC Sierra?

Start by inspecting the wiring and connectors for injector 5 for damage or corrosion. Then, use a multimeter to check for continuity and shorts in the circuit, and test the injector itself for proper operation.

6. How is the P124C code typically repaired?

Repairs may include replacing damaged wiring or connectors, replacing the injector, or repairing the short circuit. In some cases, the ECM may need reprogramming or replacement.

7. How much does it cost to fix the P124C code?

The repair cost can vary depending on the root cause. Replacing an injector typically costs $300-$700, while wiring repairs might cost $100-$300. ECM replacement or reprogramming could exceed $1,000.

8. Can a faulty injector cause the P124C code?

Yes, a faulty injector can cause a short in the circuit, triggering the P124C code.

9. Will clearing the code with a scan tool fix the issue?

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

10. What tools are needed to troubleshoot the P124C code?

You’ll need an OBDII scanner, a multimeter, and possibly wiring diagrams for your 2014 GMC Sierra to properly diagnose the issue.

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