AutoCodes – GMC – P124C 2017 GMC Sierra

P124C 2017 GMC Sierra Code - Injector 5 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 5, Fuel Injector 5 harness is open or shorted, Fuel Injector 5 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: P124C 2017 GMC Sierra indicates Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 5, Fuel Injector 5 harness is open or shorted, Fuel Injector 5 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 239

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
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Code P124C 2017 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 P124C 2017 GMC Sierra - Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P124C 2017 GMC Sierra Code - Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P124C 2017 GMC Sierra?

Faulty Fuel Injector 5
Fuel Injector 5 harness is open or shorted
Fuel Injector 5 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P124C 2017 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 P124C 2017 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 P124C 2017 GMC Sierra code?

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Need Help with the Code?

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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 P124C 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P124C in a 2017 GMC Sierra related to the Injector 5 Positive Voltage Control Circuit?

- Common symptoms include rough idling, engine misfires, loss of power, and illuminated Check Engine Light.

2. What can cause the Injector 5 Positive Voltage Control Circuit to be shorted to the control circuit in a 2017 GMC Sierra?

- Possible causes include damaged wiring, a faulty injector, a defective PCM (Powertrain Control Module), or a poor electrical connection.

3. How serious is the OBDII code P124C in a 2017 GMC Sierra?

- This code should be addressed promptly as it can lead to engine performance issues and potential long-term damage if left unresolved.

4. Can I still drive my 2017 GMC Sierra with the P124C code present?

- It is not recommended to drive the vehicle with this code present, as it can cause further damage to the engine and affect overall performance.

5. How can I diagnose the Injector 5 Positive Voltage Control Circuit shorted to control circuit issue in my 2017 GMC Sierra?

- Diagnosing this issue typically involves using a scan tool to retrieve the OBDII code, inspecting the wiring and connectors, and testing the injector and related components.

6. Is it safe to attempt to repair the OBDII code P124C in a 2017 GMC Sierra without professional help?

- While some DIY enthusiasts may be able to address simple wiring or connector issues, it is recommended to seek professional help for accurate diagnosis and repair of this code.

7. What are some repair tips for fixing the Injector 5 Positive Voltage Control Circuit shorted to control circuit issue in a 2017 GMC Sierra?

- Repair tips may include checking and repairing damaged wiring, replacing a faulty injector, ensuring proper electrical connections, and resetting the PCM after repairs.

8. Can resetting the PCM clear the OBDII code P124C in a 2017 GMC Sierra?

- Resetting the PCM may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return after driving the vehicle.

9. How much does it typically cost to repair the Injector 5 Positive Voltage Control Circuit shorted to control circuit issue in a 2017 GMC Sierra?

- The cost of repairs can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Will fixing the Injector 5 Positive Voltage Control Circuit issue improve the overall performance and fuel efficiency of my 2017 GMC Sierra?

- Yes, addressing this issue can help restore proper engine function, improve performance, and potentially enhance fuel efficiency in your GMC Sierra.