AutoCodes – GMC – B0091 2018 GMC Sierra

B0091 2018 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 2018 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 236

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 2018 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 2018 GMC Sierra - Center Front Impact Sensor - AutoCodes.com — B0091 2018 GMC Sierra Code - Center Front Impact Sensor

What does this mean?

What are the Possible Causes of the DTC B0091 2018 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 2018 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 2018 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 2018 GMC Sierra code?

Need more information on how to fix the B0091 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0091 2018 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 2018 GMC Sierra Code

1. What does OBDII code B0091 for a 2018 GMC Sierra mean?

The OBDII code B0091 for a 2018 GMC Sierra specifically refers to a fault with the Center Front Impact Sensor.

2. What are the common symptoms of a B0091 code in a 2018 GMC Sierra?

Common symptoms of a B0091 code in a 2018 GMC Sierra may include the airbag warning light illuminating on the dashboard and potential issues with the airbag system.

3. What are the possible causes of the B0091 code in a 2018 GMC Sierra?

Possible causes of a B0091 code in a 2018 GMC Sierra may include a faulty Center Front Impact Sensor, wiring issues, or a malfunction in the airbag control module.

4. How can I diagnose the B0091 code in my 2018 GMC Sierra?

Diagnosing a B0091 code in a 2018 GMC Sierra typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the wiring and connections to the Center Front Impact Sensor, and testing the sensor itself for proper functioning.

5. Can I continue driving my 2018 GMC Sierra with a B0091 code?

It is not recommended to drive a vehicle with a B0091 code, as it indicates a potential issue with the airbag system that could affect its functionality in the event of an accident.

6. How can I repair a B0091 code in my 2018 GMC Sierra?

Repairing a B0091 code in a 2018 GMC Sierra may involve replacing the faulty Center Front Impact Sensor, repairing any damaged wiring, or addressing any issues with the airbag control module.

7. Is it safe to reset a B0091 code in a 2018 GMC Sierra without fixing the underlying issue?

It is not safe to simply reset a B0091 code in a 2018 GMC Sierra without addressing the underlying problem, as it could compromise the effectiveness of the airbag system in case of an accident.

8. Are there any recalls related to the B0091 code for 2018 GMC Sierra models?

Recalls related to the B0091 code for 2018 GMC Sierra models should be checked with the manufacturer or a authorized dealership for any relevant information.

9. How much does it typically cost to repair a B0091 code in a 2018 GMC Sierra?

The cost of repairing a B0091 code in a 2018 GMC Sierra can vary depending on the specific cause of the issue, but it may involve parts and labor costs for sensor replacement or wiring repairs.

10. Can a DIY enthusiast fix a B0091 code in a 2018 GMC Sierra, or is it best left to professionals?

While some DIY enthusiasts may have the skills to diagnose and repair a B0091 code in a 2018 GMC Sierra, it is recommended to consult with a professional mechanic or technician for proper diagnosis and repair to ensure the safety and effectiveness of the airbag system.