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Engine-Codes – Generic – B1940

B1940 Code - Short in Selectable Force Limiter Squib Right Circuit

Quick Answer

The B1940 diagnostic trouble code (DTC) indicates a short in the Selectable Force Limiter Squib Right Circuit. Common causes include Short circuit in the wiring harness, Faulty selectable force limiter squib, Corrosion or damage to the connectors. 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
B1940 indicates Short in Selectable Force Limiter Squib Right Circuit.
Common causes
Common causes include Short circuit in the wiring harness, Faulty selectable force limiter squib, Corrosion or damage to the connectors.
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 B1940 Description

The B1940 diagnostic trouble code (DTC) indicates a short in the Selectable Force Limiter Squib Right Circuit. This code is typically found in vehicles equipped with advanced safety systems such as airbags. The Selectable Force Limiter Squib is a component of the airbag system that helps regulate the force of the airbag deployment based on the severity of a collision.

OBDII Code B1940 - Short in Selectable Force Limiter Squib Right Circuit
B1940 Code - Short in Selectable Force Limiter Squib Right Circuit

Common Causes of B1940

  1. Short circuit in the wiring harness
  2. Faulty selectable force limiter squib
  3. Corrosion or damage to the connectors
  4. Impact or collision that damaged the airbag system
  5. Electrical issues in the airbag control module

Symptoms of B1940

  1. Airbag warning light illuminated on the dashboard
  2. Inability to activate the airbag system
  3. Erratic or inconsistent airbag deployment
  4. Decreased safety in the event of a collision

How to Fix B1940

  1. Begin by diagnosing the specific cause of the short in the Selectable Force Limiter Squib Right Circuit using a professional-grade scan tool.
  2. Inspect the wiring harness for any signs of damage, corrosion, or wear. Repair or replace any damaged wires as necessary.
  3. Check the connectors for proper connection and signs of damage. Clean or replace connectors that are faulty.
  4. Test the selectable force limiter squib to determine if it is functioning correctly. Replace the squib if it is found to be faulty.
  5. Clear the DTC from the vehicle's system and perform a test to ensure the airbag system is functioning properly.

Cost to Fix B1940

The typical repair costs for addressing a short in the Selectable Force Limiter Squib Right Circuit can vary depending on the extent of the damage and the specific components that need to be replaced. 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 at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, rates at dealerships or in metropolitan areas may be higher, while independent shops often charge less.

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Code B1940 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 B1940 Code

1. What are the common symptoms of OBDII code B1940 (Short in Selectable Force Limiter Squib Right Circuit)?

- Common symptoms include an illuminated airbag warning light on the dashboard, inoperative seatbelt pretensioners, and a potential loss of airbag deployment functionality.

2. What are the possible causes of OBDII code B1940?

- The code B1940 can be caused by a short circuit in the selectable force limiter squib right circuit, faulty wiring connections, or a malfunctioning seatbelt pretensioner.

3. How serious is OBDII code B1940?

- OBDII code B1940 is a serious issue as it affects the functionality of critical safety components like the airbags and seatbelt pretensioners. It is important to address this issue promptly to ensure the proper operation of these safety systems.

4. Can I continue driving with OBDII code B1940 present?

- It is not recommended to continue driving with OBDII code B1940 present, as it compromises the effectiveness of the airbag system and seatbelt pretensioners, which are crucial safety features in the event of a collision.

5. How can OBDII code B1940 be diagnosed?

- Diagnosis of OBDII code B1940 typically involves using a diagnostic scanner to retrieve the fault code, followed by a thorough inspection of the airbag system, wiring, and connectors to identify the source of the short circuit.

6. What are some repair tips for addressing OBDII code B1940?

- Repair tips may include checking and repairing any damaged wiring or connectors in the selectable force limiter squib right circuit, replacing the faulty seatbelt pretensioner if necessary, and clearing the fault code from the vehicle's ECU.

7. Is it possible to reset OBDII code B1940 without fixing the underlying issue?

- While it is possible to clear the fault code temporarily, it is not recommended to reset OBDII code B1940 without addressing the underlying issue, as it could compromise the safety of the vehicle's occupants in the event of an accident.

8. How much does it typically cost to repair OBDII code B1940?

- The cost of repairing OBDII code B1940 can vary depending on the extent of the damage and the specific components that need to be replaced. It is advisable to consult a professional mechanic for an accurate diagnosis and cost estimate.

9. Are there any recalls or service bulletins related to OBDII code B1940?

- It is advisable to check with the vehicle manufacturer or authorized dealerships for any recalls or service bulletins related to OBDII code B1940, as they may provide valuable information or potential solutions for addressing the issue.

10. Can OBDII code B1940 be fixed without professional help?

- While some basic troubleshooting steps can be taken, fixing OBDII code B1940 often requires specialized knowledge and tools. It is recommended to seek the assistance of a qualified mechanic or automotive technician for proper diagnosis and repair.

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