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Engine-Codes – GMC – B0085 GMC

B0085 GMC Code - Left Front Side Impact Sensor

Quick Answer

The B0085 GMC code refers to an issue with the Left Front Side Impact Sensor in a GMC vehicle. Common causes include Damaged wiring or connectors leading to the Left Front Side Impact Sensor, Faulty Left Front Side Impact Sensor, Corrosion or debris affecting sensor operation. 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
B0085 GMC indicates Left Front Side Impact Sensor.
Common causes
Common causes include Damaged wiring or connectors leading to the Left Front Side Impact Sensor, Faulty Left Front Side Impact Sensor, Corrosion or debris affecting sensor operation.
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 13, 2024
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Code B0085 GMC Description

The B0085 GMC code refers to an issue with the Left Front Side Impact Sensor in a GMC vehicle. This sensor is a crucial component of the vehicle's safety system, designed to detect impacts or collisions on the left front side of the vehicle. When this sensor malfunctions or fails to operate correctly, it can have serious implications for the vehicle's safety features.

OBDII Code B0085 GMC - Left Front Side Impact Sensor
B0085 GMC Code - Left Front Side Impact Sensor

Common Causes of B0085 GMC

  1. Damaged wiring or connectors leading to the Left Front Side Impact Sensor.
  2. Faulty Left Front Side Impact Sensor.
  3. Corrosion or debris affecting sensor operation.
  4. Impact or collision causing sensor damage.
  5. Issues with the vehicle's electrical system affecting sensor communication.

Symptoms of B0085 GMC

  1. Airbag warning light illuminated on the dashboard.
  2. Inaccurate or delayed deployment of airbags in a collision.
  3. Seat belt pretensioners not activating properly.
  4. Diagnostic trouble code (DTC) B0085 stored in the vehicle's computer system.

How to Fix B0085 GMC

  1. Begin by diagnosing the specific cause of the B0085 code using a diagnostic scanner to pinpoint the issue.
  2. Inspect the wiring and connectors leading to the Left Front Side Impact Sensor for any damage or corrosion. Repair or replace as necessary.
  3. Test the sensor itself for proper operation and replace if found to be faulty.
  4. Clear the DTC from the vehicle's computer system and perform a test drive to ensure the code does not return.
  5. If the issue persists, further diagnosis may be required to identify any underlying electrical problems affecting the sensor.

Cost to Fix B0085 GMC

The typical repair costs for addressing a B0085 GMC code related to the Left Front Side Impact Sensor can vary depending on the specific cause of the issue. In general, the cost of replacing a sensor or repairing wiring can range from $200 to $500, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary widely, with hourly rates typically ranging from $80 to $150. Additional diagnostic time may also be necessary, so it is advisable to check with local repair shops for a more accurate estimate based on the vehicle make and model.

What does this mean?

Tech Notes for B0085 GMC

B0085:02 Left Front Side Impact Sensor Short to Ground

B0085:05 Left Front Side Impact Sensor High Voltage/Open

B0085:0F Left Front Side Impact Sensor Signal Erratic

B0085:39 Left Front Side Impact Sensor Internal Malfunction

B0085:3A Left Front Side Impact Sensor Incorrect Component Installed

B0085:71 Left Front Side Impact Sensor Invalid Data

Need more information about the B0085 GMC code?

Need more information on how to fix the B0085 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0085 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

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 B0085 GMC Code

1. What are the common symptoms of OBDII code B0085 GMC (Left Front Side Impact Sensor)?

The common symptoms of OBDII code B0085 GMC include the airbag warning light on the dashboard illuminating, potential non-deployment of the left front airbag during a collision, and diagnostic trouble codes related to the left front side impact sensor.

2. What are the possible causes of OBDII code B0085 GMC (Left Front Side Impact Sensor)?

Possible causes of OBDII code B0085 GMC include a faulty left front side impact sensor, wiring issues such as short circuits or open circuits, or a malfunction in the airbag control module.

3. How can I diagnose the OBDII code B0085 GMC (Left Front Side Impact Sensor)?

Diagnosing OBDII code B0085 GMC involves using a scan tool to retrieve the specific trouble code, inspecting the wiring and connections related to the left front side impact sensor, and performing component testing to determine if the sensor is faulty.

4. Can I drive my vehicle with OBDII code B0085 GMC (Left Front Side Impact Sensor)?

It is not recommended to drive your vehicle with OBDII code B0085 GMC, as it indicates a potential issue with the left front side impact sensor, which plays a crucial role in the proper functioning of the airbag system during a collision.

5. How can I repair OBDII code B0085 GMC (Left Front Side Impact Sensor)?

Repairing OBDII code B0085 GMC may involve replacing the left front side impact sensor, repairing any damaged wiring or connectors, or reprogramming the airbag control module to resolve the issue.

6. Is it safe to reset the OBDII code B0085 GMC (Left Front Side Impact Sensor)?

While you can reset the OBDII code B0085 GMC using a scan tool, it is important to address the root cause of the issue first to ensure the safety and functionality of the airbag system in your vehicle.

7. Can a DIY enthusiast fix OBDII code B0085 GMC (Left Front Side Impact Sensor)?

DIY enthusiasts may be able to address OBDII code B0085 GMC by following repair guides, but it is recommended to have proper knowledge and experience working with airbag systems to ensure the repair is done correctly and safely.

8. How much does it cost to fix OBDII code B0085 GMC (Left Front Side Impact Sensor)?

The cost of fixing OBDII code B0085 GMC can vary depending on the root cause of the issue, the extent of repairs needed, and whether you choose to do it yourself or seek professional help. Costs may include parts, labor, and diagnostic fees.

9. Will OBDII code B0085 GMC (Left Front Side Impact Sensor) affect vehicle safety?

OBDII code B0085 GMC indicates a potential issue with the left front side impact sensor, which can impact the proper deployment of the airbag during a collision, potentially compromising vehicle safety. It is important to address this code promptly.

10. How often does OBDII code B0085 GMC (Left Front Side Impact Sensor) occur in GMC vehicles?

OBDII code B0085 GMC (Left Front Side Impact Sensor) can occur in GMC vehicles equipped with a left front side impact sensor, especially in models that have been in accidents or have experienced wiring issues. Regular maintenance and inspection can help prevent this code from appearing.

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