AutoCodes – Generic – B273A

B273A 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 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 1,579

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 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 - Hill Descent Control Switch - AutoCodes.com — B273A Code - Hill Descent Control Switch

What does this mean?

What are the Possible Causes of the DTC B273A?

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?

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 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 code?

Need more information on how to fix the B273A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B273A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B273A Buick — Hill Descent Control Switch
B273A Cadillac — Hill Descent Control Switch
B273A Chevrolet — Hill Descent Control Switch
B273A GMC — Hill Descent Control Switch

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 Code

1. What does OBDII code B273A mean?

- OBDII code B273A refers to an issue with the Hill Descent Control Switch in the vehicle.

2. What are the common symptoms of a Hill Descent Control Switch malfunction?

- Common symptoms include the Hill Descent Control system not engaging or disengaging properly, warning lights related to the system appearing on the dashboard, and potential loss of control when driving downhill.

3. What are some possible causes of the B273A OBDII code related to the Hill Descent Control Switch?

- Causes can include a faulty Hill Descent Control Switch, wiring issues in the system, or a malfunction in the control module.

4. How can I diagnose the problem with the Hill Descent Control Switch triggering the B273A code?

- A diagnostic scan tool can help identify the specific issue by reading the trouble codes stored in the vehicle's computer system.

5. Can I still drive my vehicle if the Hill Descent Control Switch is malfunctioning?

- It is not recommended to drive the vehicle if the Hill Descent Control system is not functioning correctly, as it could impact your ability to safely navigate downhill terrain.

6. How can I repair a Hill Descent Control Switch issue causing the B273A code?

- Repair typically involves inspecting the switch, wiring, and control module for any visible damage or loose connections. Replacing any faulty components may be necessary.

7. Is it possible to reset the B273A OBDII code related to the Hill Descent Control Switch?

- Resetting the code may temporarily clear the warning light, but it is important to address the underlying issue causing the malfunction to prevent it from recurring.

8. Can a DIY enthusiast repair a Hill Descent Control Switch problem triggering the B273A code?

- While some basic troubleshooting and inspections can be done by DIY enthusiasts, more complex repairs involving wiring or control module replacement may require professional assistance.

9. How much does it typically cost to repair a Hill Descent Control Switch issue associated with the B273A code?

- Repair costs can vary depending on the exact cause of the issue and whether any components need to be replaced. It is advisable to consult a mechanic for an accurate estimate.

10. Will ignoring the B273A OBDII code related to the Hill Descent Control Switch lead to further vehicle damage?

- Ignoring the code can potentially lead to further issues with the Hill Descent Control system, affecting your vehicle's performance and safety. It is best to address the problem promptly.