AutoCodes – Chevrolet – B291B Chevrolet

B291B Chevrolet 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 Chevrolet 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 3,811

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 Chevrolet 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 Chevrolet - Content Theft Deterrent Sensor - AutoCodes.com — B291B Chevrolet Code - Content Theft Deterrent Sensor

What does this mean?

What are the Possible Causes of the DTC B291B Chevrolet?

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 Chevrolet?

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 Chevrolet 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 B291B Chevrolet code?

Need more information on how to fix the B291B Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B291B Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B291B 2014 Chevrolet Silverado — Content Theft Deterrent Sensor
B291B 2015 Chevrolet Silverado — Content Theft Deterrent Sensor
B291B 2016 Chevrolet Silverado — Content Theft Deterrent Sensor
B291B 2017 Chevrolet Silverado — Content Theft Deterrent Sensor
B291B 2018 Chevrolet Silverado — Content Theft Deterrent Sensor

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 Chevrolet Code

1. What does the OBDII code B291B for Chevrolet Content Theft Deterrent Sensor mean?

The code B291B indicates a fault in the Content Theft Deterrent Sensor system of a Chevrolet vehicle.

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

Common symptoms include issues with the vehicle's anti-theft system, such as the alarm not functioning correctly or the system falsely detecting unauthorized access.

3. What can cause the B291B Content Theft Deterrent Sensor code in a Chevrolet?

The code can be triggered by a malfunction in the Content Theft Deterrent Sensor itself, wiring issues, a faulty control module, or a problem with the key fob.

4. How can I diagnose the B291B code related to the Content Theft Deterrent Sensor in my Chevrolet?

Diagnosis typically involves using a professional OBDII scanner to read the code, inspecting the sensor and its connections, and testing the control module and key fob.

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

It is generally safe to drive the vehicle with this code, but it's recommended to address the issue promptly to prevent any potential security concerns.

6. How do I repair the B291B Content Theft Deterrent Sensor code in my Chevrolet?

Repair methods may include replacing the faulty sensor or control module, repairing damaged wiring, or reprogramming the system to resolve the issue.

7. Are there any DIY tips for fixing the B291B code in a Chevrolet?

While some basic inspections and visual checks can be done by DIY enthusiasts, resolving the code often requires professional diagnostic tools and expertise.

8. How much does it cost to repair the B291B code related to the Content Theft Deterrent Sensor in a Chevrolet?

Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can a B291B code be reset without fixing the underlying issue in a Chevrolet?

Resetting the code without addressing the root cause is not recommended, as the problem will likely persist and may lead to further issues with the vehicle's security system.

10. How often does the B291B Content Theft Deterrent Sensor code occur in Chevrolet vehicles?

While not extremely common, this code can still be encountered in Chevrolet models, especially in older vehicles or those with a history of electrical issues.