AutoCodes – GMC – P124F 2016 GMC Sierra

P124F 2016 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 2016 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 320

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P124F 2016 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 2016 GMC Sierra - Cylinder 8 Injector High Control Circuit Shorted to Control Circuit - AutoCodes.com — P124F 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the P124F 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P124F 2016 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 P124F 2016 GMC Sierra Code

What does the OBDII code P124F mean on a 2016 GMC Sierra?

P124F indicates that the Cylinder 8 injector high control circuit is shorted to the control circuit, which disrupts proper fuel delivery to that cylinder.

What are the common symptoms of code P124F on a 2016 GMC Sierra?

Symptoms may include rough idling, engine misfires, reduced power, poor fuel economy, and the Check Engine Light turning on.

What causes the P124F code to appear on a 2016 GMC Sierra?

Common causes include damaged or shorted wiring in the injector circuit, a faulty fuel injector, a malfunctioning powertrain control module (PCM), or poor electrical connections.

How can I diagnose the P124F code on my 2016 GMC Sierra?

Start by inspecting the wiring and connectors for Cylinder 8's fuel injector. Use a multimeter to test for shorts or continuity issues, and verify the injector's functionality.

Can I drive my 2016 GMC Sierra with the P124F code?

Driving with this code is not recommended, as it can lead to engine misfires, increased fuel consumption, and potential damage to other engine components.

How do I fix the P124F code on a 2016 GMC Sierra?

Repairs may include replacing damaged wiring, repairing poor electrical connections, replacing the faulty fuel injector, or reprogramming/updating the PCM if needed.

How much does it cost to fix the P124F code on a 2016 GMC Sierra?

Repair costs vary, but replacing a fuel injector may cost between $200 and $400, while addressing wiring issues or PCM reprogramming may add labor costs.

Can a bad fuel injector cause the P124F code?

Yes, a faulty or shorted fuel injector in Cylinder 8 can trigger the P124F code due to abnormal electrical feedback in the circuit.

How do I prevent the P124F code from recurring?

Regular maintenance, inspecting wiring harnesses for damage, and ensuring proper connections can help prevent this code from recurring.

Will clearing the P124F code fix the problem?

Clearing the code with an OBDII scanner will reset the Check Engine Light temporarily, but the underlying issue must be resolved to prevent the code from returning.