AutoCodes – GMC – P124F 2014 GMC Sierra

P124F 2014 GMC Sierra Code - Cylinder 8 Injector High 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 8, Fuel Injector 8 harness is open or shorted, Fuel Injector 8 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: P124F 2014 GMC Sierra indicates Cylinder 8 Injector High Control Circuit Shorted to Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 8, Fuel Injector 8 harness is open or shorted, Fuel Injector 8 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 335

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 P124F 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 P124F 2014 GMC Sierra - Cylinder 8 Injector High Control Circuit Shorted to Control Circuit - AutoCodes.com — P124F 2014 GMC Sierra Code - Cylinder 8 Injector High Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P124F 2014 GMC Sierra?

Faulty Fuel Injector 8
Fuel Injector 8 harness is open or shorted
Fuel Injector 8 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P124F 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 P124F 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 P124F 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 P124F 2014 GMC Sierra Code

What does OBDII code P124F mean in a 2014 GMC Sierra?

Code P124F indicates that the Cylinder 8 Injector High Control Circuit is shorted to the control circuit, which means there is an electrical issue affecting the injector's functionality.

What are the symptoms of code P124F in a 2014 GMC Sierra?

Common symptoms include engine misfires, reduced engine power, rough idling, poor fuel economy, and the check engine light turning on.

What causes the P124F code in a 2014 GMC Sierra?

The most common causes are damaged wiring or connectors in the injector circuit, a faulty fuel injector, or a malfunctioning engine control module (ECM).

Can driving with code P124F damage my 2014 GMC Sierra?

Driving with this code can lead to further engine damage over time, as improper fuel delivery may cause misfires or damage to other components.

How can I diagnose the P124F code in my GMC Sierra?

Use an OBDII scanner to confirm the code, then inspect the wiring and connectors for Cylinder 8's injector circuit for signs of damage or corrosion. Test the injector and ECM if no visible issues are found.

What tools are needed to fix code P124F in a 2014 GMC Sierra?

You may need an OBDII scanner, a multimeter, and basic tools for electrical repairs, such as pliers and wire cutters, depending on the exact issue.

How do I repair the P124F code on my GMC Sierra?

Repairs may include fixing or replacing damaged wiring/connectors, replacing the Cylinder 8 fuel injector, or reprogramming/replacing the ECM if necessary.

Can a dirty fuel injector trigger the P124F code?

No, a dirty fuel injector typically causes performance issues but not an electrical fault like P124F. This code specifically relates to a short in the injector circuit.

Is P124F a common issue for the 2014 GMC Sierra?

This code is not extremely common but can occur, especially in vehicles with higher mileage or those exposed to harsh conditions that may damage electrical components.

Should I take my truck to a mechanic for the P124F code?

If you're not experienced with electrical diagnostics and repairs, it's best to take the vehicle to a qualified mechanic to avoid further damage.