AutoCodes – GMC – P124A 2014 GMC Sierra

P124A 2014 GMC Sierra Code - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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: P124A 2014 GMC Sierra indicates Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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 272

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 12, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P124A 2014 GMC Sierra Description

The Engine Control Module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. The ECM energizes each fuel injector by grounding the high voltage control circuit of the fuel injector. The ECM monitors the status of the injector high voltage supply circuits and the fuel injector high voltage control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set if the ECM detects the injector high control circuit is shorted to the low control circuit for greater than 2 s.

OBDII Code P124A 2014 GMC Sierra - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P124A 2014 GMC Sierra Code - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P124A 2014 GMC Sierra?

Faulty Fuel Injector 3
Fuel Injector 3 harness is open or shorted
Fuel Injector 3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P124A 2014 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 P124A 2014 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 P124A 2014 GMC Sierra code?

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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 P124A 2014 GMC Sierra Code

1. What does the OBDII code P124A mean for a 2014 GMC Sierra?

P124A indicates that the Injector 3 Positive Voltage Control Circuit is shorted to the control circuit, which affects the fuel injection system.

2. What are the common symptoms of code P124A in a 2014 GMC Sierra?

Common symptoms include rough idling, poor acceleration, misfires, decreased fuel efficiency, and the Check Engine Light being illuminated.

3. What causes the P124A code to appear on a 2014 GMC Sierra?

This code is typically caused by damaged wiring, a short circuit, a faulty injector, or issues with the engine control module (ECM).

4. Can I drive my 2014 GMC Sierra with the P124A code?

Driving with this code is not recommended as it can lead to further damage to the engine or fuel system and cause performance issues.

5. How do I diagnose the P124A code on a 2014 GMC Sierra?

Diagnose by using a scan tool to confirm the code, inspecting the wiring and connectors for damage, and testing the injector and ECM for proper function.

6. How can wiring issues cause the P124A code?

Damaged or corroded wiring can create a short circuit between the positive voltage and control circuits of Injector 3, triggering the code.

7. What tools are needed to fix the P124A code on a 2014 GMC Sierra?

You may need a diagnostic scan tool, a multimeter, and basic automotive tools to inspect the wiring, connectors, and fuel injector.

8. How much does it cost to repair the P124A code on a 2014 GMC Sierra?

Repair costs can vary depending on the issue, but replacing an injector typically costs $200â€“$400, while wiring repairs may cost less if no major components are damaged.

9. Could a faulty ECM cause the P124A code on a 2014 GMC Sierra?

Yes, a malfunctioning ECM can fail to control the injector circuits properly, though this is less common than wiring or injector issues.

10. How can I prevent the P124A code from reoccurring?

Regular maintenance, keeping wiring and connectors in good condition, and addressing injector issues promptly can help prevent this code from reoccurring.