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Engine-Codes – Chevrolet – P124B 2018 Chevrolet Silverado

P124B 2018 Chevrolet Silverado Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The P124B diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates an issue with the injector 4 positive voltage control circuit being shorted to the control circuit. Common causes include Damaged or shorted wiring harness, Faulty fuel injector, Issues with the engine control module (ECM). 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 Damaged or shorted wiring harness, Faulty fuel injector, Issues with the engine control module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P124B 2018 Chevrolet Silverado Description

The P124B diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates an issue with the injector 4 positive voltage control circuit being shorted to the control circuit. In simpler terms, this means that there is a problem with the electrical connection that controls the fuel injector for cylinder 4 in the engine. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time for optimal engine performance.

OBDII Code P124B 2018 Chevrolet Silverado - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit
P124B 2018 Chevrolet Silverado Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit

Common Causes of P124B 2018 Chevrolet Silverado

  1. Damaged or shorted wiring harness
  2. Faulty fuel injector
  3. Issues with the engine control module (ECM)
  4. Poor electrical connection
  5. Corrosion or water intrusion in the electrical system

Symptoms of P124B 2018 Chevrolet Silverado

  1. Rough engine idling
  2. Decreased fuel efficiency
  3. Engine misfires
  4. Hesitation or stalling during acceleration
  5. Check engine light illuminated

How to Fix P124B 2018 Chevrolet Silverado

  1. Conduct a thorough visual inspection of the wiring harness and connectors to check for any visible damage or corrosion.
  2. Use a multimeter to test the continuity and resistance of the injector 4 positive voltage control circuit to identify any short circuits.
  3. Inspect the fuel injector for proper operation and replace if necessary.
  4. Clear the DTC from the vehicle's ECM using a diagnostic scan tool after the repair is completed.
  5. Perform a road test to ensure the issue has been resolved and that the vehicle is running smoothly.

Cost to Fix P124B 2018 Chevrolet Silverado

The typical repair costs for addressing a P124B code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. On average, you can expect to pay between $200 and $500 for parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources to ensure you're getting a fair price for the repair.

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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 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.

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