AutoCodes – GMC – B273A 2018 GMC Sierra

B273A 2018 GMC Sierra Code - Hill Descent Control Switch

Quick Answer

The Body Control Module (BCM) monitors the signal circuit from the Hill Descent Control Switch. Common causes include Faulty Multifunction Switch Instrument Panel, Multifunction Switch Instrument Panel harness is open or shorted, Multifunction Switch Instrument Panel 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: B273A 2018 GMC Sierra indicates Hill Descent Control Switch.
Common causes: Common causes include Faulty Multifunction Switch Instrument Panel, Multifunction Switch Instrument Panel harness is open or shorted, Multifunction Switch Instrument Panel 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 218

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 30, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B273A 2018 GMC Sierra Description

The Body Control Module (BCM) monitors the signal circuit from the Hill Descent Control Switch. The hill descent switch is a momentary switch that is normally open. When the hill descent control switch is pressed once, the body control module will request the electronic brake control module via serial data to disable or enable the hill descent control. When activated, the switch grounds the hill descent control system signal circuit. The electronic brake control module then enables or disables the hill descent control system. The electronic brake control module will request the instrument cluster via serial data to turn the hill descent indicator ON or OFF to notify the driver.

OBDII Code B273A 2018 GMC Sierra - Hill Descent Control Switch - AutoCodes.com — B273A 2018 GMC Sierra Code - Hill Descent Control Switch

What does this mean?

What are the Possible Causes of the DTC B273A 2018 GMC Sierra?

Faulty Multifunction Switch Instrument Panel
Multifunction Switch Instrument Panel harness is open or shorted
Multifunction Switch Instrument Panel circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B273A 2018 GMC Sierra?

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 B273A 2018 GMC Sierra 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 B273A 2018 GMC Sierra code?

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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.