AutoCodes – GMC – B291B 2016 GMC Sierra

B291B 2016 GMC Sierra 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 2016 GMC Sierra 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 170

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 2016 GMC Sierra 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 2016 GMC Sierra - Content Theft Deterrent Sensor - AutoCodes.com — B291B 2016 GMC Sierra Code - Content Theft Deterrent Sensor

What does this mean?

What are the Possible Causes of the DTC B291B 2016 GMC Sierra?

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 2016 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 B291B 2016 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.

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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 2016 GMC Sierra Code

1. What does OBDII code B291B for a 2016 GMC Sierra mean?

The code B291B indicates a problem with the Content Theft Deterrent (CTD) Sensor in the vehicle.

2. What are the common symptoms of a faulty Content Theft Deterrent Sensor?

Common symptoms include the alarm system not working properly, the vehicle's anti-theft features malfunctioning, or the alarm going off randomly.

3. What can cause the Content Theft Deterrent Sensor code B291B to trigger?

Possible causes for this code include a malfunctioning CTD sensor, wiring issues, a faulty control module, or a problem with the anti-theft system itself.

4. How can I diagnose the issue related to OBDII code B291B on my 2016 GMC Sierra?

Diagnosing the problem may require using a scan tool to retrieve the specific fault codes, inspecting the wiring connected to the CTD sensor, and testing the sensor's functionality.

5. Can I still drive my 2016 GMC Sierra with the B291B code present?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the anti-theft system.

6. How do I repair a Content Theft Deterrent Sensor issue causing the B291B code?

Repairing the problem may involve replacing the faulty CTD sensor, repairing any damaged wiring, resetting the control module, or reprogramming the anti-theft system.

7. Will resetting the OBDII code B291B on my 2016 GMC Sierra fix the problem?

Resetting the code may temporarily clear the fault from the system, but if the underlying issue with the Content Theft Deterrent Sensor persists, the code is likely to reappear.

8. How much does it cost to repair a Content Theft Deterrent Sensor issue on a 2016 GMC Sierra?

The cost of repair can vary depending on the specific problem, parts needed, and labor rates, but it's advisable to consult a professional mechanic for an accurate estimate.

9. Can a DIY enthusiast fix the B291B code related to the Content Theft Deterrent Sensor?

While some simple checks and repairs may be possible for a DIY enthusiast, diagnosing and resolving complex issues with the CTD sensor may require professional expertise and specialized tools.

10. How can I prevent future occurrences of the B291B code on my 2016 GMC Sierra?

Regular maintenance checks, keeping the anti-theft system in good condition, and addressing any issues promptly can help prevent the reoccurrence of the Content Theft Deterrent Sensor code B291B.