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AutoCodes – Generic – B0091:01

B0091:01 Code - Center Front Impact Sensor Short to Battery

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
B0091:01 indicates Center Front Impact Sensor Short to Battery.
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 344
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Nov 06, 2022
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Code B0091:01 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 B0091:01 - Center Front Impact Sensor Short to Battery - AutoCodes.com
B0091:01 Code - Center Front Impact Sensor Short to Battery
What does this mean?

What are the Possible Causes of the DTC B0091:01?

  • 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 B0091:01?

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 B0091:01 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 B0091:01 code?

Need more information on how to fix the B0091:01 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0091:01 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 B0091:01 Code

1. What does OBDII code B0091:01 mean?

B0091:01 indicates a "Center Front Impact Sensor Short to Battery," meaning there is an electrical issue where the sensor is receiving excessive voltage due to a wiring short.

2. What are the common symptoms of code B0091:01?

Symptoms may include the airbag warning light illuminated, disabled airbag system, or error messages related to the vehicle’s safety restraint system.

3. What causes the B0091:01 code to appear?

The most common causes are damaged wiring, a short circuit to the battery, a faulty center front impact sensor, or a malfunctioning airbag control module.

4. Can I still drive my vehicle with code B0091:01?

While the car may still be drivable, it’s unsafe because the airbag system may not function properly in the event of a collision.

5. How do I diagnose the B0091:01 code?

Diagnosis involves inspecting the wiring and connectors for damage, checking for a short circuit, and testing the center front impact sensor for proper operation.

6. How is the B0091:01 code fixed?

Repairs may include replacing damaged wiring, repairing the short circuit, replacing the center front impact sensor, or reprogramming the airbag control module.

7. Can I reset the B0091:01 code without repairs?

Resetting the code without addressing the issue is not recommended, as the problem will likely reoccur and could compromise vehicle safety.

8. How much does it cost to fix the B0091:01 code?

Repair costs depend on the issue but typically range from $100 to $500, with sensor replacement being on the higher end.

9. What tools are needed to troubleshoot the B0091:01 code?

You’ll need an OBDII scanner, a multimeter to check for short circuits, and possibly a wiring diagram for your vehicle.

10. Can a failing battery cause the B0091:01 code?

A failing battery is unlikely to cause this code directly, but irregular voltage levels could contribute to electrical issues.

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