AutoCodes – GMC – B0091 2016 GMC Sierra

B0091 2016 GMC Sierra Code - Center Front Impact Sensor

Quick Answer

The impact sensors are equipped on vehicles to supplement the Supplemental Inflatable Restraint (SIR) system performance. Common causes include Faulty Center Front Impact Sensor, Center Front Impact Sensor harness is open or shorted, Center Front Impact Sensor 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: B0091 2016 GMC Sierra indicates Center Front Impact Sensor.
Common causes: Common causes include Faulty Center Front Impact Sensor, Center Front Impact Sensor harness is open or shorted, Center Front Impact Sensor 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 366

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 Nov 06, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0091 2016 GMC Sierra Description

The impact sensors are equipped on vehicles to supplement the Supplemental Inflatable Restraint (SIR) system performance. The impact sensors are electronic and are not part of the deployment loops, instead, they provide inputs to the Inflatable Restraint Sensing and Diagnostic Module (SDM). The impact sensors can assist in determining the severity of some frontal and side collisions. The inflatable restraint sensing and the diagnostic module use the input from the impact sensors to assist in determining the severity of a collision, further supporting air bag deployment. If the inflatable restraint sensing and diagnostic module determine a deployment is warranted, the inflatable restraint sensing and diagnostic module will cause current to flow through the deployment loops deploying the appropriate air bags. The center front impact sensor and side impact sensors utilize a bidirectional 2-wire circuit. The sensors modulate current on the interface to send identification, state of health, and deployment commands to the inflatable restraint sensing and diagnostic module. The inflatable restraint sensing and diagnostic module serve as a power source and a ground for the sensors. When the ignition is turned ON and input power from the inflatable restraint sensing and the diagnostic module is first detected, the sensors respond by performing internal diagnostics and sending identification to the inflatable restraint sensing and diagnostic module. The inflatable restraint sensing and diagnostic module consider the identification to be valid if the response time is less than 5 s. The sensors continually communicate status messages to the inflatable restraint sensing and diagnostic module, which determines if a fault is present in the sensor circuit. When a fault is detected, the inflatable restraint sensing and diagnostic module may reset the sensors up to 2 times by removing and reapplying power to it. If the fault is still present, the inflatable restraint sensing and diagnostic module will set a Diagnostic Trouble Code (DTC).

OBDII Code B0091 2016 GMC Sierra - Center Front Impact Sensor - AutoCodes.com — B0091 2016 GMC Sierra Code - Center Front Impact Sensor

What does this mean?

What are the Possible Causes of the DTC B0091 2016 GMC Sierra?

Faulty Center Front Impact Sensor
Center Front Impact Sensor harness is open or shorted
Center Front Impact Sensor circuit poor electrical connection
Faulty Inflatable Restraint Sensing and Diagnostic Module (SDM)

How to Fix the DTC B0091 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 does this mean?

Code Tech Notes

B0091:01 Center Front Impact Sensor Short to Battery
B0091:02 Center Front Impact Sensor Short to Ground
B0091:05 Center Front Impact Sensor Short to Battery or Open
B0091:0F Center Front Impact Sensor Erratic
B0091:39 Center Front Impact Sensor Internal Electronic Failure
B0091:3A Center Front Impact Sensor Incorrect Component Installed
B0091:71 Center Front Impact Sensor Invalid Serial Data Received

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0091 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.

Need more information about the B0091 2016 GMC Sierra code?

Need more information on how to fix the B0091 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0091 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B0091 2016 GMC Sierra Code

1. What does OBDII code B0091 for a 2016 GMC Sierra mean?

The B0091 code indicates a problem with the Center Front Impact Sensor on a 2016 GMC Sierra.

2. What are the common symptoms of OBDII code B0091 in a 2016 GMC Sierra?

Common symptoms of code B0091 include the airbag warning light illuminating on the dashboard and potential issues with the airbag system.

3. What are possible causes of OBDII code B0091 in a 2016 GMC Sierra?

Potential causes of code B0091 can include a faulty Center Front Impact Sensor, wiring issues, or a malfunction in the airbag control module.

4. How can I diagnose OBDII code B0091 in my 2016 GMC Sierra?

Diagnosing code B0091 typically involves using a scan tool to retrieve the specific fault code, inspecting the Center Front Impact Sensor and related wiring, and testing the airbag system components.

5. Can I continue driving my 2016 GMC Sierra with OBDII code B0091?

It is not recommended to drive your vehicle with an active airbag fault code like B0091, as it may compromise the effectiveness of the airbag system in the event of a collision.

6. How serious is OBDII code B0091 in a 2016 GMC Sierra?

Code B0091 should be addressed promptly as it indicates a potential issue with the airbag system's ability to deploy in a front impact collision, impacting overall safety.

7. How much does it cost to repair OBDII code B0091 in a 2016 GMC Sierra?

The cost of repairing B0091 can vary depending on the specific cause of the issue, but it may involve replacing the Center Front Impact Sensor, repairing wiring, or addressing other related components.

8. Can I reset OBDII code B0091 in my 2016 GMC Sierra myself?

While you can clear the code with a scan tool, it is crucial to diagnose and address the underlying problem causing code B0091 to prevent it from reoccurring.

9. Are there any DIY tips for fixing OBDII code B0091 in a 2016 GMC Sierra?

DIY tips for addressing code B0091 may include checking the sensor's connections, inspecting for visible damage, and ensuring all wiring is intact before seeking professional assistance.

10. How can I prevent OBDII code B0091 from coming back in my 2016 GMC Sierra?

Regularly inspecting and maintaining the airbag system, following proper vehicle maintenance schedules, and addressing any related issues promptly can help prevent the recurrence of code B0091 in your GMC Sierra.