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Engine-Codes – Generic – B0042

B0042 Code - Driver Frontal Deployment Loop Stage 2 Resistance Low

Quick Answer

The B0042 code indicates that there is a low resistance detected in the driver frontal deployment loop stage 2. Common causes include Faulty wiring or connections in the driver frontal deployment loop stage 2, Malfunctioning airbag sensor or module, Corrosion or damage to the airbag system components. 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
B0042 indicates Driver Frontal Deployment Loop Stage 2 Resistance Low.
Common causes
Common causes include Faulty wiring or connections in the driver frontal deployment loop stage 2, Malfunctioning airbag sensor or module, Corrosion or damage to the airbag system components.
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 14, 2024
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Code B0042 Description

The B0042 code indicates that there is a low resistance detected in the driver frontal deployment loop stage 2. This typically refers to an issue with the driver's side airbag system. The driver frontal deployment loop stage 2 is a crucial part of the vehicle's safety system that is responsible for deploying the airbag in the event of a collision. When the resistance is low, it means that there may be a problem with the circuit or wiring that connects the airbag to the vehicle's computer.

OBDII Code B0042 - Driver Frontal Deployment Loop Stage 2 Resistance Low
B0042 Code - Driver Frontal Deployment Loop Stage 2 Resistance Low

Common Causes of B0042

  1. Faulty wiring or connections in the driver frontal deployment loop stage 2.
  2. Malfunctioning airbag sensor or module.
  3. Corrosion or damage to the airbag system components.
  4. Issues with the clockspring in the steering column.
  5. Impact or collision that damaged the airbag system components.

Symptoms of B0042

  1. Illumination of the airbag warning light on the dashboard.
  2. Inability of the driver's side airbag to deploy in a collision.
  3. Intermittent or erratic deployment of the driver's side airbag.
  4. Diagnostic trouble codes related to the airbag system stored in the vehicle's computer.

How to Fix B0042

  1. Diagnose the issue by using a scan tool to retrieve the specific trouble code and identify the exact cause of the low resistance.
  2. Inspect the wiring, connections, and components of the driver frontal deployment loop stage 2 for any signs of damage or corrosion.
  3. Test the airbag sensor and module to ensure they are functioning correctly.
  4. Replace any faulty components, such as damaged wiring or a malfunctioning sensor, and retest the system to ensure the issue has been resolved.
  5. Clear the trouble codes from the vehicle's computer to reset the airbag system and ensure that the warning light is no longer illuminated.

Cost to Fix B0042

The cost of repairing a low resistance in the driver frontal deployment loop stage 2 can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the parts and labor for this repair can range from $200 to $500. However, it's important to note that the actual cost may be higher or lower based on factors such as the vehicle make and model, the location of the repair shop, and the rates charged for diagnosis and labor. It's recommended to consult with a qualified mechanic or repair shop to get a more accurate estimate for your specific situation.

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Code B0042 Information for Specific Makes

  • B0042 Buick — Driver Frontal Deployment Loop Stage 2 Resistance Low
  • B0042 Cadillac — Driver Frontal Deployment Loop Stage 2 Resistance Low
  • B0042 Chevrolet — Driver Frontal Deployment Loop Stage 2 Resistance Low
  • B0042 GMC — Driver Frontal Deployment Loop Stage 2 Resistance Low

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.

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