B0091:3A Code - Center Front Impact Sensor Incorrect Component Installed
Quick Answer
The B0091:3A diagnostic trouble code (DTC) indicates that the center front impact sensor in the vehicle has an incorrect component installed. Common causes include Incorrect installation of a component during a previous repair or maintenance, Use of aftermarket or counterfeit parts in the center front impact sensor, Damage to the sensor due to a previous collision or impact. 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
- B0091:3A indicates Center Front Impact Sensor Incorrect Component Installed.
- Common causes
- Common causes include Incorrect installation of a component during a previous repair or maintenance, Use of aftermarket or counterfeit parts in the center front impact sensor, Damage to the sensor due to a previous collision or impact.
- 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 B0091:3A Description
The B0091:3A diagnostic trouble code (DTC) indicates that the center front impact sensor in the vehicle has an incorrect component installed. The center front impact sensor is a crucial part of the vehicle's safety system, as it helps detect collisions and deploy airbags to protect occupants in the event of an accident. When the sensor detects an impact, it sends a signal to the airbag control module to deploy the airbags.
Common Causes of B0091:3A
- Incorrect installation of a component during a previous repair or maintenance.
- Use of aftermarket or counterfeit parts in the center front impact sensor.
- Damage to the sensor due to a previous collision or impact.
- Corrosion or water damage affecting the sensor's connections.
- Electrical issues such as a short circuit in the sensor's wiring.
Symptoms of B0091:3A
- Airbag warning light illuminated on the dashboard.
- Inaccurate or inconsistent airbag deployment in crash tests.
- Fault codes related to the center front impact sensor stored in the vehicle's computer.
- Loss of communication with the airbag control module.
How to Fix B0091:3A
- Diagnose the issue using a scan tool to retrieve the specific DTC and identify the incorrect component.
- Remove the center front impact sensor to access the component in question.
- Replace the incorrect component with the correct one recommended by the vehicle manufacturer.
- Clear the fault codes from the vehicle's computer and perform a test to ensure the sensor is functioning properly.
- Reset the airbag system to ensure proper deployment in the event of a collision.
Cost to Fix B0091:3A
The cost of repairing a B0091:3A DTC can vary depending on the make and model of the vehicle, the location of the repair shop, and the specific component that needs to be replaced. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. It is important to note that additional costs may be incurred if other components are found to be damaged or if further diagnostics are required. It is recommended to consult with a trusted mechanic or repair shop to get an accurate estimate based on the specific circumstances of your vehicle.
Tech Notes for B0091:3A
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
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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.
Frequently Asked Questions about B0091:3A Code
1. What does the OBDII code B0091:3A mean?
This code indicates that the center front impact sensor has been replaced with an incorrect or incompatible component.
2. What are the symptoms of a B0091:3A code?
Common symptoms include an illuminated airbag warning light, potential deactivation of the airbag system, and possible fault messages on the dashboard.
3. What causes the B0091:3A code to appear?
The code is triggered when the vehicle’s control module detects a mismatch or incompatibility with the installed center front impact sensor, often due to using the wrong part.
4. Can driving with a B0091:3A code be dangerous?
Yes, because this fault may impair the functionality of the airbag system, which is critical for passenger safety in the event of a collision.
5. How is the B0091:3A code diagnosed?
A technician will inspect the center front impact sensor, confirm its part number and compatibility, and use a scan tool to verify the specific fault data.
6. How can I fix the B0091:3A code?
Replace the incorrect sensor with a manufacturer-approved part that matches the vehicle’s specifications, then clear the code with a scan tool.
7. What should I check before replacing the sensor for B0091:3A?
Ensure the replacement sensor is compatible with your vehicle’s make, model, and year, and verify the part number with the manufacturer’s specifications.
8. Can a B0091:3A code be caused by wiring issues?
While uncommon, damaged wiring, loose connections, or corrosion in the sensor’s circuit can sometimes cause compatibility errors and should be inspected.
9. Will clearing the B0091:3A code fix the issue?
Clearing the code without addressing the incorrect component will not resolve the issue and the code will likely return.
10. Do I need to recalibrate the system after fixing the B0091:3A code?
Yes, after replacing the sensor, the airbag system may need to be recalibrated using a diagnostic tool to ensure proper functionality.
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