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Engine-Codes – Generic – B1905

B1905 Code - Short in Front Pretensioner Squib Left Circuit

Quick Answer

The B1905 diagnostic trouble code (DTC) indicates a short in the front pretensioner squib left circuit. Common causes include Wiring harness damage or wear leading to a short in the circuit, Faulty front pretensioner squib component, Corrosion or loose connections in the wiring. 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
B1905 indicates Short in Front Pretensioner Squib Left Circuit.
Common causes
Common causes include Wiring harness damage or wear leading to a short in the circuit, Faulty front pretensioner squib component, Corrosion or loose connections in the wiring.
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 09, 2024
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Code B1905 Description

The B1905 diagnostic trouble code (DTC) indicates a short in the front pretensioner squib left circuit. The front pretensioner squib is a component of the vehicle's safety system that is responsible for tightening the seatbelt in the event of a collision, helping to secure the occupant in their seat and reduce the risk of injury. The squib is an explosive charge that activates during a crash, pulling the seatbelt tight to restrain the occupant.

OBDII Code B1905 - Short in Front Pretensioner Squib Left Circuit
B1905 Code - Short in Front Pretensioner Squib Left Circuit

Common Causes of B1905

  1. Wiring harness damage or wear leading to a short in the circuit.
  2. Faulty front pretensioner squib component.
  3. Corrosion or loose connections in the wiring.
  4. Impact damage to the vehicle that affects the front pretensioner squib.
  5. Manufacturing defect in the seatbelt pretensioner system.

Symptoms of B1905

  1. Illumination of the airbag warning light on the dashboard.
  2. Inoperable front seatbelt pretensioner on the driver's side.
  3. Erratic behavior of the seatbelt system, such as sudden tightening or loosening.
  4. Failure of the seatbelt to retract properly.
  5. Reduced effectiveness of the seatbelt in securing the occupant during sudden stops or collisions.

How to Fix B1905

  1. Begin by diagnosing the specific cause of the short in the front pretensioner squib left circuit using a diagnostic scanner to retrieve the fault codes.
  2. Inspect the wiring harness and connections for any signs of damage, corrosion, or loose connections. Repair or replace any damaged components.
  3. Test the front pretensioner squib component itself to determine if it is faulty and replace if necessary.
  4. Clear the fault codes from the vehicle's computer and reset the airbag system to ensure proper operation.
  5. Conduct a thorough test drive to verify that the issue has been resolved and that the front seatbelt pretensioner is functioning correctly.

Cost to Fix B1905

The cost of repairing a short in the front pretensioner squib left circuit can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It's important to note that diagnosis time and labor rates can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local auto repair shops for a more accurate estimate.

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Code B1905 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.

Frequently Asked Questions about B1905 Code

1. What are the common symptoms of OBDII code B1905 - Short in Front Pretensioner Squib Left Circuit?

The common symptoms include the airbag warning light illuminating on the dashboard and potential non-deployment of the left front airbag in the event of an accident.

2. What are the possible causes of OBDII code B1905?

Possible causes of this code include a short circuit in the wiring of the front pretensioner squib left circuit, a faulty pretensioner squib, or a problem with the airbag control module.

3. How serious is OBDII code B1905 - Short in Front Pretensioner Squib Left Circuit?

This code is serious as it indicates a potential safety issue with the left front airbag system. It is important to address this code promptly to ensure the proper function of the airbag in the event of a collision.

4. Can I continue driving with OBDII code B1905 present?

It is not recommended to continue driving with this code present, as it may compromise the effectiveness of the left front airbag in the event of a crash. It is advisable to address the issue as soon as possible.

5. How can OBDII code B1905 be diagnosed?

Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault codes, followed by inspecting the wiring, connectors, and components of the front pretensioner squib left circuit to identify the source of the short circuit.

6. What are some repair tips for fixing OBDII code B1905?

Repair tips may include checking and repairing any damaged wiring or connectors in the front pretensioner squib left circuit, replacing the faulty pretensioner squib if needed, and resetting the airbag control module after the repairs are completed.

7. Can I reset the OBDII code B1905 on my own?

While you can attempt to clear the code with an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from reoccurring. If the problem persists, it is recommended to seek professional assistance.

8. Is it safe to attempt DIY repairs for OBDII code B1905?

Due to the critical nature of the airbag system, it is recommended to have repairs related to OBDII code B1905 performed by a qualified technician with experience in handling airbag systems to ensure proper diagnosis and repair.

9. How much does it typically cost to repair OBDII code B1905?

The cost of repairing this code can vary depending on the exact cause of the issue and the required repairs. Costs may include labor charges for diagnosis and repair, parts replacement, and any necessary reprogramming of the airbag control module.

10. Can OBDII code B1905 affect the overall safety of my vehicle?

Yes, OBDII code B1905 can affect the overall safety of your vehicle by potentially preventing the left front airbag from deploying in a collision. It is crucial to address this code promptly to ensure the proper functioning of the airbag system for driver and passenger safety.

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