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Engine-Codes – GMC – B273A 2017 GMC Sierra

B273A 2017 GMC Sierra Code - Hill Descent Control Switch

Quick Answer

The diagnostic trouble code B273A for a 2017 GMC Sierra relates to an issue with the Hill Descent Control (HDC) switch. Common causes include Faulty HDC switch, Wiring issues or electrical connections related to the HDC system, Malfunctioning sensors that communicate with 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 2017 GMC Sierra indicates Hill Descent Control Switch.
Common causes
Common causes include Faulty HDC switch, Wiring issues or electrical connections related to the HDC system, Malfunctioning sensors that communicate with 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 29, 2024
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Code B273A 2017 GMC Sierra Description

The diagnostic trouble code B273A for a 2017 GMC Sierra relates to an issue with the Hill Descent Control (HDC) switch. Hill Descent Control is a feature that helps vehicles maintain a steady speed when driving down steep inclines, enhancing safety and control for the driver. The HDC switch allows the driver to activate and deactivate this feature as needed.

OBDII Code B273A 2017 GMC Sierra - Hill Descent Control Switch
B273A 2017 GMC Sierra Code - Hill Descent Control Switch

Common Causes of B273A 2017 GMC Sierra

  1. Faulty HDC switch
  2. Wiring issues or electrical connections related to the HDC system
  3. Malfunctioning sensors that communicate with the HDC system
  4. Software glitches in the vehicle's onboard computer system
  5. Physical damage to the HDC components due to off-road use or environmental factors

Symptoms of B273A 2017 GMC Sierra

  1. HDC feature not engaging or disengaging properly
  2. Warning light on the dashboard related to Hill Descent Control
  3. Loss of traction control on steep inclines
  4. Vehicle struggling to maintain speed on downhill slopes
  5. Unusual noises or vibrations when using the HDC feature

How to Fix B273A 2017 GMC Sierra

  1. Begin by conducting a thorough diagnostic scan to confirm the B273A code and identify the specific issue with the HDC switch.
  2. Inspect the HDC switch, wiring, and related components for any visible damage or loose connections.
  3. Test the functionality of the HDC system using diagnostic tools to pinpoint the exact cause of the malfunction.
  4. Replace the faulty HDC switch or repair any damaged wiring or components as needed.
  5. Clear the diagnostic trouble code from the vehicle's computer system and test the HDC feature to ensure proper operation.

Cost to Fix B273A 2017 GMC Sierra

The typical repair costs for addressing the B273A code related to the Hill Descent Control switch in a 2017 GMC Sierra can vary depending on the extent of the issue and the specific parts or components that require replacement. On average, the repair for this type of problem may range from $200 to $500, including parts and labor. However, it is important to note that prices can fluctuate based on factors such as location, vehicle make and model, and the expertise of the auto repair shop. Diagnostic time and labor rates can also impact the final cost, with rates typically ranging from $80 to $150 per hour. For a more accurate estimate, it is recommended to consult with a qualified mechanic or auto repair shop in your area.

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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.

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