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Engine-Codes – Generic – B1920

B1920 Code - Air Bag Passenger Circuit Failure

Quick Answer

The B1920 diagnostic trouble code indicates an issue with the airbag passenger circuit in the vehicle. Common causes include Faulty passenger airbag sensor, Wiring or electrical issues in the airbag circuit, Loose or corroded connections in the airbag system. 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
B1920 indicates Air Bag Passenger Circuit Failure.
Common causes
Common causes include Faulty passenger airbag sensor, Wiring or electrical issues in the airbag circuit, Loose or corroded connections in the airbag system.
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 10, 2024
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Code B1920 Description

The B1920 diagnostic trouble code indicates an issue with the airbag passenger circuit in the vehicle. This means that there is a failure or malfunction in the circuit that is responsible for deploying the airbag on the passenger side of the vehicle in the event of a collision. This code can have serious safety implications as the airbag may not deploy properly in a crash, putting the occupants at risk of injury.

OBDII Code B1920 - Air Bag Passenger Circuit Failure
B1920 Code - Air Bag Passenger Circuit Failure

Common Causes of B1920

  1. Faulty passenger airbag sensor.
  2. Wiring or electrical issues in the airbag circuit.
  3. Loose or corroded connections in the airbag system.
  4. Issues with the airbag control module.
  5. Impact or damage to the passenger side of the vehicle that affects the airbag system.

Symptoms of B1920

  1. Airbag warning light is illuminated on the dashboard.
  2. Passenger airbag may not deploy in a collision.
  3. Intermittent issues with the passenger airbag system.
  4. Faulty or erratic readings from the passenger airbag sensor.

How to Fix B1920

  1. Diagnose the issue: Use a diagnostic scan tool to read the fault codes and identify the specific cause of the airbag passenger circuit failure.
  2. Inspect wiring and connections: Check for loose or damaged wiring, connectors, and terminals in the airbag circuit. Repair or replace any damaged components.
  3. Test the passenger airbag sensor: Test the functionality of the passenger airbag sensor to determine if it is faulty. Replace if necessary.
  4. Reset the airbag system: Clear the fault codes and reset the airbag system to see if the issue has been resolved.
  5. Verify repair: After completing the repair, test the airbag system to ensure that the passenger airbag deploys properly and that the airbag warning light is no longer illuminated.

Cost to Fix B1920

The cost of repairing an airbag passenger circuit failure can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, you can expect to pay anywhere from $200 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's best to get a few quotes from different shops in your area to determine the most accurate cost estimate for your vehicle.

Need more information about the B1920 code?

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Code B1920 Information for Specific Makes

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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