AutoCodes – Chevrolet – B0091 2018 Chevrolet Silverado

B0091 2018 Chevrolet Silverado 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 Chevrolet Silverado 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 430

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B0091 2018 Chevrolet Silverado 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 Chevrolet Silverado - Center Front Impact Sensor - AutoCodes.com — B0091 2018 Chevrolet Silverado Code - Center Front Impact Sensor

What does this mean?

What are the Possible Causes of the DTC B0091 2018 Chevrolet Silverado?

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 Chevrolet Silverado?

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 Chevrolet Silverado 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 Chevrolet Silverado code?

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

Need Help with the Code?

Get the B0091 2018 Chevrolet Silverado 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 Chevrolet Silverado Code

1. What does the OBDII code B0091 for a 2018 Chevrolet Silverado indicate?

The code B0091 specifically relates to the Center Front Impact Sensor on a 2018 Chevrolet Silverado.

2. What are some common symptoms of a B0091 OBDII code in a 2018 Chevrolet Silverado?

Common symptoms of a B0091 code may include the airbag warning light illuminating on the dashboard and potential issues with the airbag system's deployment.

3. What are the possible causes of the B0091 OBDII code in a 2018 Chevrolet Silverado?

Possible causes of the B0091 code include a malfunctioning center front impact sensor, wiring issues, or a problem with the airbag control module.

4. How can I diagnose the B0091 OBDII code in my 2018 Chevrolet Silverado?

Diagnosing the B0091 code typically involves using a scan tool to retrieve the specific fault code, inspecting the center front impact sensor and its wiring for damage, and conducting further tests as needed.

5. Is it safe to drive my 2018 Chevrolet Silverado with a B0091 OBDII code?

It is not recommended to drive your vehicle with an active B0091 code, as it indicates a potential issue with the airbag system's functionality, which could compromise safety in the event of a collision.

6. Can I reset the B0091 OBDII code in my 2018 Chevrolet Silverado on my own?

While you can attempt to clear the code using an OBDII scan tool, it is crucial to address the underlying issue causing the B0091 code to prevent it from reoccurring.

7. How much does it typically cost to repair a B0091 OBDII code in a 2018 Chevrolet Silverado?

The cost of repairing a B0091 code can vary depending on the specific cause of the issue, but it may involve replacing the center front impact sensor, repairing wiring, or addressing issues with the airbag control module.

8. Should I attempt to repair the B0091 OBDII code in my 2018 Chevrolet Silverado myself?

It is recommended to have a professional mechanic diagnose and repair the B0091 code, as it involves the vehicle's safety systems and requires specialized knowledge and tools.

9. Are there any preventative measures to avoid the B0091 OBDII code in a 2018 Chevrolet Silverado?

Regularly inspecting the airbag system components, such as the impact sensors, and addressing any issues promptly can help prevent the occurrence of the B0091 code.

10. How long does it usually take to repair a B0091 OBDII code in a 2018 Chevrolet Silverado?

The repair time for a B0091 code can vary depending on the exact cause of the issue and the availability of parts, but it may take a few hours to a full day to complete the necessary repairs.