AutoCodes – GMC – P124E 2015 GMC Sierra

P124E 2015 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 2015 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.

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Code Popularity 178

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 P124E 2015 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 2015 GMC Sierra - Cylinder 7 Injector High Control Circuit Shorted to Control Circuit - AutoCodes.com — P124E 2015 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 2015 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 2015 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 2015 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.

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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 P124E 2015 GMC Sierra Code

What does the OBDII code P124E mean for a 2015 GMC Sierra?

P124E indicates that the Cylinder 7 Injector High Control Circuit is shorted to the control circuit, meaning there is a wiring or electrical issue affecting the injector's operation.

What are the symptoms of code P124E in a 2015 GMC Sierra?

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

What causes the P124E code to appear in a 2015 GMC Sierra?

Common causes include damaged or frayed wiring, a short circuit in the injector control circuit, a faulty fuel injector, or a malfunctioning ECM (Engine Control Module).

Can I drive my 2015 GMC Sierra with the P124E code?

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

How do I diagnose the P124E code on a 2015 GMC Sierra?

Diagnosis involves inspecting the wiring and connectors for damage, testing the injector for proper resistance, and using a scan tool to monitor the injector circuit.

How do I fix the P124E code on a 2015 GMC Sierra?

Repairs may include repairing or replacing damaged wiring, replacing the fuel injector for Cylinder 7, or updating/replacing the ECM if necessary.

Can a bad fuel injector cause the P124E code?

Yes, a faulty fuel injector can cause the control circuit to malfunction and trigger the P124E code.

What tools are needed to troubleshoot the P124E code?

Basic tools include a multimeter for testing electrical circuits, a scan tool for diagnostic readings, and potentially wiring diagrams for the injector system.

Will clearing the code fix the P124E issue permanently?

Clearing the code will only reset the check engine light temporarily. The underlying issue causing the code must be resolved to prevent it from returning.

How much does it cost to repair a P124E code on a 2015 GMC Sierra?

Costs vary depending on the issue, with wiring repairs typically costing less than $200, injector replacement ranging from $300 to $600, and ECM replacement being more expensive.