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Engine-Codes – GMC – B273A 2018 GMC Sierra

B273A 2018 GMC Sierra Code - Hill Descent Control Switch

Quick Answer

The B273A diagnostic trouble code (DTC) specifically refers to an issue with the Hill Descent Control (HDC) switch in a 2018 GMC Sierra. Common causes include Faulty Hill Descent Control switch, Damaged wiring or connections related to the HDC system, Malfunctioning control module that manages the HDC system. 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
B273A 2018 GMC Sierra indicates Hill Descent Control Switch.
Common causes
Common causes include Faulty Hill Descent Control switch, Damaged wiring or connections related to the HDC system, Malfunctioning control module that manages the HDC system.
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 B273A 2018 GMC Sierra Description

The B273A diagnostic trouble code (DTC) specifically refers to an issue with the Hill Descent Control (HDC) switch in a 2018 GMC Sierra. Hill Descent Control is a feature that assists the driver when descending steep inclines by automatically controlling the vehicle's speed without the need for constant braking. The HDC switch is an integral part of this system, allowing the driver to activate and deactivate the feature as needed.

OBDII Code B273A 2018 GMC Sierra - Hill Descent Control Switch
B273A 2018 GMC Sierra Code - Hill Descent Control Switch

Common Causes of B273A 2018 GMC Sierra

  1. Faulty Hill Descent Control switch.
  2. Damaged wiring or connections related to the HDC system.
  3. Malfunctioning control module that manages the HDC system.
  4. Water or debris infiltration affecting the HDC switch.
  5. Electrical issues within the HDC system components.

Symptoms of B273A 2018 GMC Sierra

  1. Inability to activate or deactivate the Hill Descent Control system.
  2. Illumination of the HDC warning light on the dashboard.
  3. Loss of control or erratic behavior when descending steep inclines.
  4. Reduced effectiveness of the HDC system in maintaining a consistent speed downhill.
  5. An audible warning or chime when attempting to use the HDC switch.

How to Fix B273A 2018 GMC Sierra

  1. Begin by conducting a thorough diagnostic scan to confirm the B273A code and pinpoint the exact source of the issue.
  2. Inspect the HDC switch for any visible damage or signs of wear, and replace it if necessary.
  3. Check the wiring and connections related to the HDC system for any breaks, corrosion, or loose connections, and repair or replace them as needed.
  4. Test the control module that manages the HDC system for proper functionality, and replace it if it is found to be faulty.
  5. Clear the diagnostic trouble code from the vehicle's system and perform a test drive to ensure that the HDC switch is functioning correctly and the code does not reappear.

Cost to Fix B273A 2018 GMC Sierra

The cost of repairing a Hill Descent Control switch issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, the parts for replacing a faulty HDC switch can range from $50 to $150, while labor costs can add an additional $80 to $150 per hour. Overall, the total repair cost for addressing a B273A code related to the HDC switch in a 2018 GMC Sierra could range from $150 to $500, depending on the extent of repairs needed. It's recommended to obtain quotes from local auto repair shops to get a more accurate estimate based on your location and vehicle specifics.

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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 B273A 2018 GMC Sierra Code

1. What does the OBDII code B273A mean for a 2018 GMC Sierra related to the Hill Descent Control Switch?

The B273A code indicates a malfunction in the Hill Descent Control Switch system on a 2018 GMC Sierra.

2. What are the common symptoms of a B273A OBDII code in a 2018 GMC Sierra?

Common symptoms of the B273A code may include the Hill Descent Control system not engaging or disengaging unexpectedly, and a warning light on the dashboard.

3. What are possible causes of the B273A OBDII code in a 2018 GMC Sierra?

Potential causes of the B273A code include a faulty Hill Descent Control Switch, wiring issues, or a malfunction in the control module.

4. How can I diagnose the B273A OBDII code in my 2018 GMC Sierra related to the Hill Descent Control Switch?

Diagnosing the B273A code involves checking the wiring and connections related to the Hill Descent Control Switch, as well as testing the switch itself for proper functionality.

5. Can I still drive my 2018 GMC Sierra with a B273A OBDII code related to the Hill Descent Control Switch?

It is generally safe to drive with the B273A code, but it is recommended to have the issue diagnosed and repaired as soon as possible to ensure the proper functioning of the Hill Descent Control system.

6. Is it possible to reset the B273A OBDII code in a 2018 GMC Sierra without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is important to address the root cause of the problem to prevent the code from reappearing.

7. How much does it typically cost to repair a B273A OBDII code in a 2018 GMC Sierra related to the Hill Descent Control Switch?

The cost of repair can vary depending on the specific issue causing the code, but it may involve replacing the Hill Descent Control Switch or addressing wiring issues, with costs ranging from $100 to $300 or more.

8. Can a DIY enthusiast fix the B273A OBDII code related to the Hill Descent Control Switch in a 2018 GMC Sierra?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the issue themselves, especially if it involves simple tasks like checking connections or replacing a switch.

9. Will the B273A OBDII code in a 2018 GMC Sierra reset on its own after the issue is fixed?

Once the underlying problem causing the B273A code is resolved, the code can be cleared using an OBDII scanner, and it should not reappear if the repair was successful.

10. How important is it to address the B273A OBDII code related to the Hill Descent Control Switch in a 2018 GMC Sierra?

Addressing the B273A code is important to ensure the proper functioning of the Hill Descent Control system, which can be a valuable safety feature when driving in challenging terrain.

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