AutoCodes – Cadillac – B0091 Cadillac

B0091 Cadillac 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 Cadillac 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 1,276

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 Cadillac 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 Cadillac - Center Front Impact Sensor - AutoCodes.com — B0091 Cadillac Code - Center Front Impact Sensor

What does this mean?

What are the Possible Causes of the DTC B0091 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

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

Need Help with the Code?

Get the B0091 Cadillac 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 Cadillac Code

1. What are the common symptoms of an OBDII code B0091 in a Cadillac related to the Center Front Impact Sensor?

- Common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the deployment of the airbags in the event of a collision.

2. What typically causes the OBDII code B0091 on a Cadillac center front impact sensor?

- The code B0091 in a Cadillac center front impact sensor is often triggered by a malfunction or failure in the sensor itself, wiring issues, or a faulty connection.

3. How can I diagnose the OBDII code B0091 related to the Cadillac center front impact sensor?

- Diagnosis involves using an OBDII scan tool to read the specific error code, checking the sensor and its wiring for physical damage, and ensuring all connections are secure.

4. Are there any safety concerns associated with an unresolved OBDII code B0091 in a Cadillac center front impact sensor?

- Yes, unresolved issues with the center front impact sensor may compromise the proper functioning of the airbag system, potentially affecting occupant safety in the event of a collision.

5. Can I repair the OBDII code B0091 on a Cadillac's center front impact sensor myself?

- While some basic diagnosis and inspection can be done by DIY enthusiasts, repairing or replacing the center front impact sensor should be handled by a qualified technician to ensure proper installation and functionality.

6. What are the potential repair options for addressing the OBDII code B0091 in a Cadillac center front impact sensor?

- Repair options may include checking and securing wiring connections, replacing the faulty sensor, or addressing any underlying issues that may have triggered the error code.

7. Will resetting the OBDII code B0091 on a Cadillac center front impact sensor resolve the issue?

- Resetting the code may temporarily clear the error from the system, but it will likely return if the underlying issue with the center front impact sensor is not addressed and repaired.

8. How crucial is it to address the OBDII code B0091 related to the Cadillac center front impact sensor promptly?

- It is essential to address the code promptly to ensure the proper functioning of the airbag system and maintain occupant safety in the event of a collision.

9. Are there any recalls or technical service bulletins related to the OBDII code B0091 in Cadillac vehicles?

- It's recommended to check with the manufacturer or authorized dealerships for any recalls or technical service bulletins related to the OBDII code B0091 specific to Cadillac vehicles.

10. Can a malfunctioning center front impact sensor triggering the OBDII code B0091 affect other vehicle systems?

- While the primary concern is the impact on the airbag system, a malfunctioning center front impact sensor may also affect related safety systems and should be addressed promptly.