AutoCodes – GMC – P124A 2015 GMC Sierra

P124A 2015 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 2015 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 208

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 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 P124A 2015 GMC Sierra - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P124A 2015 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 2015 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 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 P124A 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 P124A 2015 GMC Sierra Code

What does the OBDII code P124A mean for a 2015 GMC Sierra?

P124A indicates that there is a problem with the injector 3 positive voltage control circuit, suggesting a short circuit in the control circuit.

What are the common symptoms of a P124A code?

Common symptoms include poor engine performance, rough idling, increased fuel consumption, and potential engine misfires.

What could cause the P124A code to trigger?

Causes may include a shorted wire in the injector control circuit, a faulty injector, issues with the engine control module (ECM), or poor electrical connections.

How can I diagnose the P124A code?

To diagnose P124A, check the wiring and connectors for damage or corrosion, test the injector for proper operation, and use a multimeter to check for voltage and ground at the injector.

What should I check first if I encounter a P124A code?

Start by visually inspecting the wiring and connectors related to injector 3 for any signs of damage or short circuits.

Can I drive my GMC Sierra with a P124A code?

It's not recommended to drive with a P124A code, as it can lead to engine performance issues and potential damage if not addressed.

What repairs might be needed to fix the P124A code?

Repairs may include replacing damaged wiring, repairing connectors, replacing the faulty injector, or addressing issues within the ECM.

Is it necessary to clear the code after repairs?

Yes, after repairs are made, it's important to clear the code using an OBDII scanner and then perform a test drive to ensure the issue is resolved.

How can I prevent a P124A code from recurring?

To prevent recurrence, regularly inspect electrical connections and wiring for wear and tear, and ensure that maintenance on the fuel system is performed as needed.