AutoCodes – Chevrolet – P124C 2018 Chevrolet Silverado

P124C 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 357

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 P124C 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P124C 2018 Chevrolet Silverado Code - Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P124C 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P124C 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2018 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P124C in a 2018 Chevrolet Silverado?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and potential stalling.

2. What causes the Injector 5 Positive Voltage Control Circuit to be shorted to the Control Circuit in a 2018 Chevrolet Silverado?

- The most common cause is a damaged or shorted wiring harness related to Injector 5 or a faulty Injector 5 itself.

3. How serious is the P124C OBDII code in a 2018 Chevrolet Silverado?

- This code should be addressed promptly as it can lead to poor engine performance, potential damage to the injector system, and increased emissions.

4. Can I drive my 2018 Chevrolet Silverado with the P124C code?

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

5. What is the typical repair process for OBDII code P124C in a 2018 Chevrolet Silverado?

- The repair process usually involves diagnosing the exact cause of the shorted circuit, repairing or replacing the damaged wiring or injector, and resetting the fault code.

6. How can I prevent the Injector 5 Positive Voltage Control Circuit from shorting in my 2018 Chevrolet Silverado?

- Regular maintenance checks, avoiding water exposure to the engine compartment, and ensuring proper installation of components can help prevent this issue.

7. Can a DIY enthusiast fix the P124C code in a 2018 Chevrolet Silverado?

- While some experienced DIY enthusiasts may be able to diagnose and repair the issue, it is recommended to consult a professional mechanic due to the complexity of the electrical system.

8. What is the approximate cost to repair the Injector 5 Positive Voltage Control Circuit shorted to Control Circuit in a 2018 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the issue, but it typically ranges from $200 to $600 including parts and labor.

9. Will the P124C code reset itself after the repair in a 2018 Chevrolet Silverado?

- After the repair is completed, the fault code should be cleared using an OBDII scanner to reset the system and ensure the issue has been resolved.

10. How important is it to address the P124C code promptly in a 2018 Chevrolet Silverado?

- It is crucial to address this code promptly to prevent further damage to the engine, ensure optimal performance, and maintain the vehicle's emissions compliance.