AutoCodes – Chevrolet – P124B 2018 Chevrolet Silverado

P124B 2018 Chevrolet Silverado Code - Injector 4 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 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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: P124B 2018 Chevrolet Silverado indicates Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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 363

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 P124B 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 P124B 2018 Chevrolet Silverado - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P124B 2018 Chevrolet Silverado Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P124B 2018 Chevrolet Silverado?

Faulty Fuel Injector 4
Fuel Injector 4 harness is open or shorted
Fuel Injector 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P124B 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 P124B 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 P124B 2018 Chevrolet Silverado code?

Need more information on how to fix the P124B 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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Get the P124B 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 P124B 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P124B on a 2018 Chevrolet Silverado?

The common symptoms of code P124B include rough idling, engine misfires, decreased fuel efficiency, and potentially stalling of the engine.

2. What does the OBDII code P124B indicate in a 2018 Chevrolet Silverado?

Code P124B indicates that the positive voltage control circuit for Injector 4 is shorted to the control circuit in the fuel injector system.

3. What are the possible causes of OBDII code P124B on a 2018 Chevrolet Silverado?

Possible causes of code P124B include damaged wiring, faulty fuel injector, a short circuit in the control circuit, or issues with the Engine Control Module (ECM).

4. How can I diagnose the OBDII code P124B on my 2018 Chevrolet Silverado?

Diagnosing code P124B involves inspecting the wiring harness for damage, testing the fuel injector, checking for short circuits, and using a scan tool to analyze the control circuit.

5. Can I still drive my 2018 Chevrolet Silverado with OBDII code P124B?

It is not recommended to drive your vehicle with code P124B as it can lead to further damage to the engine and affect its performance. It's best to address the issue promptly.

6. How do I repair OBDII code P124B on my 2018 Chevrolet Silverado?

Repairing code P124B may involve replacing the damaged wiring, repairing or replacing the fuel injector, addressing any short circuits, or reprogramming the Engine Control Module (ECM).

7. Will resetting the OBDII code P124B on my 2018 Chevrolet Silverado make the problem go away?

Resetting the code may temporarily turn off the Check Engine Light, but it will not fix the underlying issue causing code P124B. It's essential to diagnose and repair the problem to prevent further issues.

8. How much does it cost to fix OBDII code P124B on a 2018 Chevrolet Silverado?

The cost of fixing code P124B can vary depending on the exact cause of the issue, the extent of the repairs needed, and labor rates. It's advisable to consult a mechanic for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P124B on a 2018 Chevrolet Silverado?

While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing code P124B may require specialized tools and expertise. It's recommended to seek professional help for this issue.

10. How can I prevent OBDII code P124B from occurring in my 2018 Chevrolet Silverado?

To prevent code P124B, regular maintenance of your vehicle, including checking the wiring harness for damage, ensuring proper fuel injector function, and addressing any issues promptly, can help prevent this code from occurring.