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Engine-Codes – Generic – B0099

B0099 Code - Roll Over Sensor

Quick Answer

The B0099 diagnostic trouble code refers to an issue with the Roll Over Sensor in the vehicle's safety system. Common causes include Faulty roll over sensor, Corrosion or damage to sensor wiring, Impact or collision that damages the sensor. 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
B0099 indicates Roll Over Sensor.
Common causes
Common causes include Faulty roll over sensor, Corrosion or damage to sensor wiring, Impact or collision that damages the sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code B0099 Description

The B0099 diagnostic trouble code refers to an issue with the Roll Over Sensor in the vehicle's safety system. This sensor is designed to detect if the vehicle is at risk of rolling over and trigger safety measures such as deploying airbags or activating rollover protection systems. When this sensor malfunctions or fails, it could potentially compromise the vehicle's ability to respond effectively in the event of a rollover, putting occupants at greater risk of injury.

OBDII Code B0099 - Roll Over Sensor
B0099 Code - Roll Over Sensor

Common Causes of B0099

  1. Faulty roll over sensor
  2. Corrosion or damage to sensor wiring
  3. Impact or collision that damages the sensor
  4. Electronic control unit (ECU) issues
  5. Software glitches in the vehicle's safety system

Symptoms of B0099

  1. Illuminated airbag warning light on the dashboard
  2. Inaccurate or erratic readings from the sensor
  3. Unexpected deployment of airbags
  4. Loss of communication with the vehicle's safety systems
  5. Vehicle may not pass a safety inspection

How to Fix B0099

  1. Diagnose the specific cause of the issue using a scan tool to read the fault codes
  2. Inspect the roll over sensor and its wiring for any signs of damage or corrosion
  3. Replace the roll over sensor if it is found to be faulty
  4. Clear the fault codes from the vehicle's ECU and test the sensor to ensure proper function
  5. Reset the airbag system and perform a test drive to confirm the repair

Cost to Fix B0099

The cost of repairing a roll over sensor issue can vary depending on the make and model of the vehicle, as well as the extent of the problem. On average, the cost of replacing a roll over sensor can range from $200 to $500, including parts and labor. Additional diagnostic fees may apply, and it's recommended to consult with a professional mechanic for an accurate estimate based on your specific vehicle and location.

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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 B0099 Code

1. What is OBDII code B0099 related to the Roll Over Sensor?

The B0099 code specifically relates to a fault detected in the Roll Over Sensor within the vehicle's restraint control module.

2. What are common symptoms of a Roll Over Sensor issue triggering code B0099?

Common symptoms include the illumination of the airbag warning light on the dashboard, potential deployment issues with the airbag system, and diagnostic trouble code B0099 stored in the vehicle's system.

3. What are possible causes of OBDII code B0099 being triggered?

Possible causes of code B0099 include a malfunctioning Roll Over Sensor, wiring issues, a faulty restraint control module, or a problem with the vehicle's SRS (Supplemental Restraint System).

4. How can I diagnose a Roll Over Sensor problem causing code B0099?

Diagnosis typically involves using a professional OBDII scanner to read the trouble codes stored in the vehicle's system, followed by a detailed inspection of the Roll Over Sensor, its wiring, and the associated components for any visible damage or faults.

5. Can I drive my vehicle with OBDII code B0099 present?

It is not recommended to drive the vehicle with code B0099 active, as it indicates a potential issue with the airbag system that may affect its functionality in the event of a collision.

6. How can I repair a Roll Over Sensor issue triggering code B0099?

Repairing a Roll Over Sensor problem may involve replacing the faulty sensor, repairing damaged wiring, resetting the fault codes with a scanner, or seeking assistance from a professional mechanic for a comprehensive diagnosis and repair.

7. Is it safe to reset the OBDII code B0099 on my own?

While you can reset the code using an OBDII scanner, it is crucial to address the underlying issue causing code B0099 to prevent potential safety risks associated with the airbag system's malfunction.

8. Are Roll Over Sensor issues covered under warranty?

Depending on the vehicle's warranty coverage and the specific terms and conditions, Roll Over Sensor-related problems triggering code B0099 may be covered under certain warranties, especially if the vehicle is still within the warranty period.

9. Can a DIY enthusiast replace a faulty Roll Over Sensor causing code B0099?

Replacing a Roll Over Sensor can be a complex task that requires proper knowledge and tools. While some enthusiasts may have the skills to do so, it is recommended to consult a professional mechanic for accurate diagnosis and repair to ensure safety and proper functioning of the airbag system.

10. How can I prevent OBDII code B0099 issues in the future?

Regular maintenance checks, prompt attention to warning lights, and addressing any airbag system symptoms promptly can help prevent Roll Over Sensor issues triggering code B0099. It is also advisable to follow the manufacturer's recommended service schedule for the vehicle.

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