AutoCodes – Buick – B291B Buick

B291B Buick Code - Content Theft Deterrent Sensor

Quick Answer

The Body Control Module (BCM) performs various communication fault detection tests to determine if a software, hardware, or communication concern exists with the ultrasonic intrusion sensor. Common causes include Faulty Content Theft Deterrent Sensor Module, Content Theft Deterrent Sensor Module harness is open or shorted, Content Theft Deterrent Sensor Module 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: B291B Buick indicates Content Theft Deterrent Sensor.
Common causes: Common causes include Faulty Content Theft Deterrent Sensor Module, Content Theft Deterrent Sensor Module harness is open or shorted, Content Theft Deterrent Sensor Module 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 674

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 Jun 01, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B291B Buick Description

The Body Control Module (BCM) performs various communication fault detection tests to determine if a software, hardware, or communication concern exists with the ultrasonic intrusion sensor. The sensor being disconnected, a poor connection at the connector, or the vehicle battery being discharged could all cause the communication to be interrupted. This interruption stops the self-test from completing which causes Diagnostic Trouble Code (DTC) B291B. This is not because of the sensor failing, it is because of a previous or existing open connection between the sensor and the BCM. Restoring this connection and then arming the theft system will complete the test and allow the DTC to be cleared. The DTC will be set when the BCM cannot communicate with the ultrasonic intrusion sensor.

OBDII Code B291B Buick - Content Theft Deterrent Sensor - AutoCodes.com — B291B Buick Code - Content Theft Deterrent Sensor

What does this mean?

What are the Possible Causes of the DTC B291B Buick?

Faulty Content Theft Deterrent Sensor Module
Content Theft Deterrent Sensor Module harness is open or shorted
Content Theft Deterrent Sensor Module circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B291B Buick?

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 B291B Buick 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.

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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 B291B Buick Code

1. What does OBDII code B291B for Buick Content Theft Deterrent Sensor indicate?

The B291B code specifically relates to a fault in the Content Theft Deterrent Sensor in a Buick vehicle.

2. What are the common symptoms of a B291B Buick code?

Common symptoms include issues with the vehicle's security system, such as false alarms, the alarm not sounding, or the vehicle failing to start.

3. What are the possible causes of the B291B code in a Buick?

Possible causes include a malfunctioning Content Theft Deterrent Sensor, wiring issues, a faulty control module, or a weak battery.

4. How can I diagnose the B291B Buick code?

Diagnosis typically involves using a diagnostic scanner to retrieve the code, inspecting the sensor and its wiring for any visible damage, and testing the sensor's functionality.

5. Can I still drive my Buick with a B291B code?

It is generally safe to drive the vehicle with this code, but it's important to address the issue promptly to ensure the security system functions correctly.

6. How do I repair the B291B Buick code?

Repair methods can include replacing the Content Theft Deterrent Sensor, repairing or replacing damaged wiring, resetting the control module, or addressing any battery issues.

7. Should I reset the B291B code after making repairs?

Yes, it's recommended to clear the code after repairs to see if the issue has been resolved. This can be done using a diagnostic scanner.

8. Can a DIY enthusiast fix the B291B code, or should I seek professional help?

While some basic troubleshooting and repairs can be done by DIY enthusiasts, complex issues may require the expertise of a professional mechanic.

9. How much does it cost to fix a B291B Buick code?

The cost can vary depending on the specific issue and the labor rates in your area. It's advisable to get a few quotes from different mechanics to compare prices.

10. How can I prevent the B291B code from reoccurring in my Buick?

Regular maintenance, keeping the vehicle's battery in good condition, and addressing any security system issues promptly can help prevent the B291B code from reoccurring.