Engine-Codes.com
Engine-Codes – GMC – B144A 2018 GMC Sierra

B144A 2018 GMC Sierra Code - Run Power Relay Circuit

Quick Answer

The B144A diagnostic trouble code (DTC) in a 2018 GMC Sierra indicates a problem with the Run Power Relay Circuit. Common causes include Faulty power relay, Wiring or connection issues in the Run Power Relay Circuit, Corrosion or damage to the relay or circuit components. 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
B144A 2018 GMC Sierra indicates Run Power Relay Circuit.
Common causes
Common causes include Faulty power relay, Wiring or connection issues in the Run Power Relay Circuit, Corrosion or damage to the relay or circuit components.
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 17, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B144A 2018 GMC Sierra Description

The B144A diagnostic trouble code (DTC) in a 2018 GMC Sierra indicates a problem with the Run Power Relay Circuit. This code is typically triggered when the power relay that controls the vehicle's electrical systems fails to function properly. The power relay is responsible for supplying power to various components in the vehicle, such as the ignition system, fuel pump, and other critical systems. When this relay malfunctions, it can lead to a variety of issues that can affect the vehicle's performance and drivability.

OBDII Code B144A 2018 GMC Sierra - Run Power Relay Circuit
B144A 2018 GMC Sierra Code - Run Power Relay Circuit

Common Causes of B144A 2018 GMC Sierra

  1. Faulty power relay
  2. Wiring or connection issues in the Run Power Relay Circuit
  3. Corrosion or damage to the relay or circuit components
  4. Electrical system overload
  5. Software or programming issues

Symptoms of B144A 2018 GMC Sierra

  1. Engine stalling or difficulty starting
  2. Electrical issues such as flickering lights or malfunctioning accessories
  3. Vehicle going into "limp mode" with reduced power
  4. Check Engine Light illuminated on the dashboard

How to Fix B144A 2018 GMC Sierra

  1. Begin by conducting a visual inspection of the power relay and the wiring in the Run Power Relay Circuit to check for any visible damage, corrosion, or loose connections.
  2. Test the power relay using a multimeter to determine if it is functioning correctly. Replace the relay if it is found to be faulty.
  3. Check the wiring harness and connectors for any signs of damage or wear. Repair or replace any damaged components as needed.
  4. Clear the DTC from the vehicle's computer using a diagnostic scan tool and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the electrical system.

Cost to Fix B144A 2018 GMC Sierra

The typical repair costs for addressing a B144A DTC related to the Run Power Relay Circuit can vary depending on the extent of the issue and the specific components that need to be replaced. In general, the cost of replacing a power relay and conducting related repairs can range from $150 to $300, including parts and labor. However, it's important to note that the actual cost may be higher or lower based on factors such as the location of the repair shop, the make and model of the vehicle, and any additional repairs that may be necessary. Diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It's recommended to obtain a detailed estimate from a qualified mechanic to determine the exact cost for addressing this specific issue in a 2018 GMC Sierra.

Need more information about the B144A 2018 GMC Sierra code?

Need more information on how to fix the B144A 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B144A 2018 GMC Sierra 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 B144A 2018 GMC Sierra Code

1. What does the OBDII code B144A mean on a 2018 GMC Sierra?

The B144A code refers to a fault in the Run Power Relay Circuit, indicating an issue with the relay responsible for powering certain vehicle systems during operation.

2. What are the symptoms of the B144A code in a 2018 GMC Sierra?

Symptoms may include electrical components like the radio, HVAC system, or dashboard not functioning, intermittent power loss, or the vehicle failing to start.

3. What causes the B144A code to appear on a 2018 GMC Sierra?

Common causes include a faulty run power relay, damaged wiring or connectors in the circuit, or a malfunctioning control module.

4. How can I diagnose the B144A code on my 2018 GMC Sierra?

Use a diagnostic scanner to confirm the code, inspect the run power relay for proper function, and check the wiring and connectors for signs of damage or corrosion.

5. Can a bad run power relay cause the vehicle not to start?

Yes, a faulty run power relay can prevent power from reaching essential systems, potentially causing the vehicle not to start.

6. Is the B144A code in a 2018 GMC Sierra dangerous to drive with?

It depends on the severity of the issue. If critical systems lose power, it can affect drivability and safety. It’s best to address the problem promptly.

7. How do I fix the B144A code on a 2018 GMC Sierra?

Repairs may include replacing the run power relay, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the control module.

8. Where is the run power relay located in a 2018 GMC Sierra?

The run power relay is typically located in the under-hood fuse box. Refer to the owner’s manual for its exact location.

9. How much does it cost to repair the B144A code on a 2018 GMC Sierra?

Repair costs can vary, but replacing a run power relay typically costs $50–$150, with additional costs for wiring repairs or module replacement if needed.

10. Can I reset the B144A code without fixing the problem?

Clearing the code with a diagnostic scanner may temporarily remove it, but if the underlying issue isn’t resolved, the code will likely return.

Discuss the causes and fixes for B144A 2018 GMC Sierra OBDII Code

Submit a New Comment

Code B144A 2018 GMC Sierra comments

No comments found for this page.