AutoCodes – GMC – P124E 2014 GMC Sierra

P124E 2014 GMC Sierra Code - Cylinder 7 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 7, Fuel Injector 7 harness is open or shorted, Fuel Injector 7 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: P124E 2014 GMC Sierra indicates Cylinder 7 Injector High Control Circuit Shorted to Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 7, Fuel Injector 7 harness is open or shorted, Fuel Injector 7 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 216

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 P124E 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 P124E 2014 GMC Sierra - Cylinder 7 Injector High Control Circuit Shorted to Control Circuit - AutoCodes.com — P124E 2014 GMC Sierra Code - Cylinder 7 Injector High Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P124E 2014 GMC Sierra?

Faulty Fuel Injector 7
Fuel Injector 7 harness is open or shorted
Fuel Injector 7 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P124E 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 P124E 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 P124E 2014 GMC Sierra code?

Need more information on how to fix the P124E 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P124E 2014 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 P124E 2014 GMC Sierra Code

1. What does the OBDII code P124E mean on a 2014 GMC Sierra?

The code P124E indicates a problem with the Cylinder 7 injector high control circuit, specifically that it is shorted to the control circuit.

2. What are the common symptoms of the P124E code?

Symptoms may include rough idling, reduced engine performance, misfires in cylinder 7, poor fuel efficiency, or the Check Engine Light being illuminated.

3. What causes the P124E code to appear?

The main causes include damaged or shorted wiring in the injector circuit, a faulty cylinder 7 fuel injector, a malfunctioning engine control module (ECM), or corroded electrical connections.

4. Can I drive my 2014 GMC Sierra with the P124E code?

Itâ€™s not recommended to drive with this code active, as it can lead to further engine damage, misfires, or reduced performance.

5. How do I diagnose the P124E code?

Diagnose the code by inspecting the wiring and connectors for cylinder 7â€™s injector, testing the injector resistance, checking for shorts to ground, and using a scan tool to analyze live data.

6. How do I fix the P124E code on my GMC Sierra?

Fixes may include repairing or replacing damaged wiring, cleaning or replacing corroded connectors, replacing the cylinder 7 fuel injector, or reprogramming the ECM if needed.

7. How much does it cost to repair the P124E code?

Repair costs vary but typically range from $200 to $600 depending on whether wiring repairs, injector replacement, or ECM reprogramming is required.

8. Can a bad fuel injector cause the P124E code?

Yes, a faulty fuel injector in cylinder 7 can cause the P124E code by creating a short in the control circuit.

9. What tools are needed to troubleshoot the P124E code?

Youâ€™ll need a multimeter to check for electrical shorts, a diagnostic scan tool for live data analysis, and possibly a noid light to test injector operation.

10. Does the P124E code require ECM replacement?

ECM replacement is not usually required unless the ECM is confirmed to be damaged or unable to control the injector circuit properly.