AutoCodes – GMC – P124D GMC

P124D GMC Code - Injector 6 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 6, Fuel Injector 6 harness is open or shorted, Fuel Injector 6 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: P124D GMC indicates Injector 6 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 6, Fuel Injector 6 harness is open or shorted, Fuel Injector 6 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 3,044

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P124D GMC 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 P124D GMC - Injector 6 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P124D GMC Code - Injector 6 Positive Voltage Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P124D GMC?

Faulty Fuel Injector 6
Fuel Injector 6 harness is open or shorted
Fuel Injector 6 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P124D GMC?

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 P124D GMC 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 P124D GMC code?

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Need Help with the Code?

Get the P124D GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P124D 2014 GMC Sierra — Injector 6 Positive Voltage Control Circuit Shorted to Control Circuit
P124D 2015 GMC Sierra — Injector 6 Positive Voltage Control Circuit Shorted to Control Circuit
P124D 2016 GMC Sierra — Injector 6 Positive Voltage Control Circuit Shorted to Control Circuit
P124D 2017 GMC Sierra — Injector 6 Positive Voltage Control Circuit Shorted to Control Circuit
P124D 2018 GMC Sierra — Injector 6 Positive Voltage Control Circuit Shorted to Control Circuit

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 P124D GMC Code

1. What are the common symptoms of OBDII code P124D GMC?

Common symptoms of this code may include rough idling, engine misfires, poor acceleration, and potentially decreased fuel efficiency.

2. What can cause the Injector 6 Positive Voltage Control Circuit to short to the Control Circuit?

Possible causes for this issue can be a damaged injector, wiring harness issues, a faulty ECM, or a short circuit in the control circuit.

3. How do I diagnose the Injector 6 Positive Voltage Control Circuit shorted to Control Circuit problem?

Diagnosis involves using a multimeter to check the resistance of the injector circuit, inspecting the wiring for damage, and testing the ECM for proper functioning.

4. Can I drive my vehicle with OBDII code P124D GMC?

It is not recommended to drive your vehicle with this code present, as it can lead to further damage to the engine or emissions system.

5. How can I repair the Injector 6 Positive Voltage Control Circuit shorted to Control Circuit issue?

Repairing this problem involves replacing the damaged injector, repairing any wiring issues, and potentially reprogramming or replacing the ECM.

6. Is it safe to ignore OBDII code P124D GMC?

Ignoring this code can lead to poor engine performance, potential damage to other components, and may cause your vehicle to fail emissions tests.

7. Is there a way to prevent the Injector 6 Positive Voltage Control Circuit shorted to Control Circuit problem?

Regular maintenance and inspections can help prevent this issue, along with avoiding rough driving conditions that can cause damage to the injector system.

8. Can a DIY enthusiast fix the Injector 6 Positive Voltage Control Circuit shorted to Control Circuit problem?

While some experienced DIY enthusiasts may be able to diagnose and repair this issue, it is recommended to seek help from a professional mechanic due to the complexity of the repair.

9. What are the potential long-term effects of ignoring OBDII code P124D GMC?

Ignoring this code can lead to permanent damage to the engine, increased repair costs, and potential safety hazards if the issue worsens.

10. How much does it typically cost to repair OBDII code P124D GMC at a repair shop?

Repair costs for this code can vary depending on the exact cause of the issue, but it is advisable to budget for several hundred dollars for parts and labor.