AutoCodes – GMC – B0091 2017 GMC Sierra

B0091 2017 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 2017 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 216

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 2017 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 2017 GMC Sierra - Center Front Impact Sensor - AutoCodes.com — B0091 2017 GMC Sierra Code - Center Front Impact Sensor

What does this mean?

What are the Possible Causes of the DTC B0091 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the B0091 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0091 2017 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 2017 GMC Sierra Code

1. What is OBDII code B0091 in a 2017 GMC Sierra related to the Center Front Impact Sensor?

This code indicates a fault with the center front impact sensor of the vehicle's airbag system.

2. What are common symptoms of OBDII code B0091 in a 2017 GMC Sierra?

Common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the airbag system's functionality.

3. What are possible causes of OBDII code B0091 in a 2017 GMC Sierra?

Potential causes of this code include a faulty center front impact sensor, wiring issues, or a problem with the airbag control module.

4. How can I diagnose the issue related to OBDII code B0091 in my 2017 GMC Sierra?

Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the wiring and connections related to the center front impact sensor, and testing the sensor itself for proper functionality.

5. Can I repair OBDII code B0091 in my 2017 GMC Sierra myself?

While some DIY enthusiasts may attempt to address this issue, it is recommended to have a qualified mechanic or technician diagnose and repair the problem to ensure proper functioning of the airbag system.

6. Is it safe to drive my 2017 GMC Sierra with OBDII code B0091 present?

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

7. How much does it typically cost to repair OBDII code B0091 in a 2017 GMC Sierra?

The cost of repairing this code can vary depending on the underlying issue, but it may involve replacing the center front impact sensor, repairing wiring, or addressing other related components.

8. Can resetting the OBDII code B0091 in my 2017 GMC Sierra make the problem go away?

Simply resetting the code without addressing the underlying issue will not fix the problem, as the fault will likely return until the root cause is resolved.

9. Are there any recalls or technical service bulletins related to OBDII code B0091 in a 2017 GMC Sierra?

It is advisable to check with a GMC dealership or online databases for any recalls or technical service bulletins related to this specific OBDII code to see if there are any known issues or remedies.

10. How can I prevent OBDII code B0091 from occurring in my 2017 GMC Sierra in the future?

Regular maintenance and inspections of the airbag system, including checking the sensors and wiring, can help prevent issues like B0091 from occurring.