AutoCodes – GMC – B0091 2015 GMC Sierra

B0091 2015 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 2015 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 222

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 2015 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 2015 GMC Sierra - Center Front Impact Sensor - AutoCodes.com — B0091 2015 GMC Sierra Code - Center Front Impact Sensor

What does this mean?

What are the Possible Causes of the DTC B0091 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the B0091 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0091 2015 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 2015 GMC Sierra Code

1. What does OBDII code B0091 for a 2015 GMC Sierra indicate?

The B0091 code in a 2015 GMC Sierra specifically relates to the Center Front Impact Sensor.

2. What are the common symptoms of OBDII code B0091 in a 2015 GMC Sierra?

Common symptoms of the B0091 code may include the airbag warning light illuminating on the dashboard or a message indicating an issue with the airbag system.

3. What can cause the B0091 code to trigger in a 2015 GMC Sierra?

The B0091 code in a 2015 GMC Sierra is typically triggered by a malfunction or fault in the Center Front Impact Sensor, often due to wiring issues or sensor damage.

4. How serious is the OBDII code B0091 in a 2015 GMC Sierra?

The B0091 code relating to the Center Front Impact Sensor is a serious issue as it directly affects the proper functioning of the airbag system, potentially compromising occupant safety in the event of a collision.

5. How can I diagnose the B0091 code in my 2015 GMC Sierra?

Diagnosing the B0091 code requires a professional OBDII scanner to read the trouble code and further testing to determine the exact cause of the Center Front Impact Sensor malfunction.

6. Can I continue driving my 2015 GMC Sierra with the B0091 code present?

It is not recommended to drive your 2015 GMC Sierra with the B0091 code active, as it indicates a problem with the airbag system's crucial safety component.

7. How can I repair the B0091 code in my 2015 GMC Sierra?

Repairing the B0091 code may involve replacing the Center Front Impact Sensor, addressing any wiring issues, or repairing sensor damage as needed.

8. Is it possible to reset the B0091 code in a 2015 GMC Sierra without fixing the underlying issue?

Resetting the B0091 code without addressing the underlying problem with the Center Front Impact Sensor is not advisable, as the issue will likely persist and compromise the airbag system's functionality.

9. Are there any DIY tips for addressing the B0091 code in a 2015 GMC Sierra?

Due to the safety implications and complexity of the airbag system, it is recommended to seek professional help to diagnose and repair the B0091 code in a 2015 GMC Sierra.

10. How much does it cost to fix the B0091 code in a 2015 GMC Sierra?

The cost of fixing the B0091 code can vary depending on the exact cause of the issue, parts and labor costs, and whether the repair is done at a dealership or an independent repair shop.