AutoCodes – GMC – B273A 2017 GMC Sierra

B273A 2017 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 2017 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 290

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 2017 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 2017 GMC Sierra - Hill Descent Control Switch - AutoCodes.com — B273A 2017 GMC Sierra Code - Hill Descent Control Switch

What does this mean?

What are the Possible Causes of the DTC B273A 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra Code

1. What does the OBDII code B273A mean on a 2017 GMC Sierra?

The code B273A indicates an issue with the Hill Descent Control (HDC) switch circuit, such as a malfunction or irregular signal.

2. What are the symptoms of OBDII code B273A in a 2017 GMC Sierra?

Common symptoms include the Hill Descent Control system not activating, a warning light on the dashboard, and possible loss of HDC functionality.

3. What causes the B273A code to appear in a 2017 GMC Sierra?

The code may be triggered by a faulty HDC switch, damaged wiring, poor electrical connections in the switch circuit, or a software-related issue in the control module.

4. Can I still drive my 2017 GMC Sierra with the B273A code?

Yes, you can still drive the vehicle, but the Hill Descent Control system may not function, which could impact performance on steep declines.

5. How do I diagnose the B273A code in a 2017 GMC Sierra?

Start by inspecting the HDC switch for damage, check the wiring and connectors for corrosion or loose connections, and use a scan tool to confirm the code and monitor switch functionality.

6. How do I fix the B273A code on a 2017 GMC Sierra?

Repairs may involve replacing the Hill Descent Control switch, repairing damaged wiring, or cleaning and securing electrical connections in the switch circuit.

7. Is the Hill Descent Control switch expensive to replace on a 2017 GMC Sierra?

The cost of the switch itself is generally affordable, but labor costs may vary depending on the repair shop or dealership.

8. Can a software issue cause the B273A code on a 2017 GMC Sierra?

Yes, outdated or corrupted software in the control module could potentially cause this code and may require a software update or reprogramming.

9. How can I prevent the B273A code from returning?

Regular maintenance, inspecting electrical connections for corrosion, and addressing any issues with the HDC system promptly can help prevent this code from recurring.

10. Is it safe to clear the B273A code without fixing the problem?

Clearing the code without addressing the underlying issue may cause it to return and could leave the Hill Descent Control system nonfunctional.