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Engine-Codes – Generic – B1C39

B1C39 Code - 1st Row Driver Retractor Tensioner Circuit High

Quick Answer

The B1C39 diagnostic trouble code (DTC) indicates a problem with the 1st Row Driver Retractor Tensioner Circuit being too high. Common causes include Faulty driver retractor tensioner, Damaged wiring or connectors in the circuit, Blown fuse related to the tensioner 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
B1C39 indicates 1st Row Driver Retractor Tensioner Circuit High.
Common causes
Common causes include Faulty driver retractor tensioner, Damaged wiring or connectors in the circuit, Blown fuse related to the tensioner 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 16, 2024
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Code B1C39 Description

The B1C39 diagnostic trouble code (DTC) indicates a problem with the 1st Row Driver Retractor Tensioner Circuit being too high. This code is typically found in vehicles equipped with advanced safety systems such as seat belt tensioners. The driver retractor tensioner is responsible for tightening the seat belt in the event of a collision to secure the driver in place and reduce the risk of injury.

OBDII Code B1C39 - 1st Row Driver Retractor Tensioner Circuit High
B1C39 Code - 1st Row Driver Retractor Tensioner Circuit High

Common Causes of B1C39

  1. Faulty driver retractor tensioner
  2. Damaged wiring or connectors in the circuit
  3. Blown fuse related to the tensioner system
  4. Issues with the airbag control module
  5. Corrosion or poor connections in the system

Symptoms of B1C39

  1. Illuminated airbag warning light on the dashboard
  2. Seat belt warning light stays on
  3. Seat belt tensioner not engaging during sudden braking
  4. Inability to reset the airbag system after attempted repairs

How to Fix B1C39

  1. Begin by conducting a thorough visual inspection of the wiring and connectors related to the driver retractor tensioner circuit.
  2. Test the tensioner itself to determine if it is functioning properly or needs to be replaced.
  3. Check and replace any blown fuses in the system.
  4. Use a diagnostic tool to scan the airbag control module for any error codes and address them accordingly.
  5. Clear the DTC from the vehicle's memory and test the system to ensure the issue has been resolved.

Cost to Fix B1C39

The cost of repairing a 1st Row Driver Retractor Tensioner Circuit High issue can vary depending on the specific cause of the problem and the vehicle's make and model. In general, the parts for this repair could range from $100 to $300, with labor costs adding an additional $100 to $200. Overall, the total repair cost could be anywhere from $200 to $500. It's important to note that these are rough estimates, and actual costs may differ based on the factors mentioned earlier. It's recommended to consult with a qualified mechanic or repair shop for a more accurate cost assessment.

When is the Code Detected?

This Diagnostic Trouble Code (DTC) sets when the Occupant Restraint Controller (ORC) detects a short to voltage on the squib circuit for more than 2.5 seconds. This DTC transitions from active to stored when the module sees a recovery from a short to voltage for greater than 2.5 seconds.

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Code B1C39 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 B1C39 Code

1. What does the OBDII code B1C39 mean?

The code B1C39 refers to a fault in the 1st Row Driver Retractor Tensioner Circuit, indicating that the circuit voltage is higher than expected.

2. What are the common symptoms of code B1C39?

Common symptoms include an illuminated airbag warning light, the seatbelt pretensioner not functioning properly, and potentially a fault stored in the airbag system.

3. What causes the B1C39 code to appear?

This code is typically caused by a faulty seatbelt pretensioner, damaged wiring or connectors in the circuit, or issues with the airbag control module.

4. Can I continue driving with the B1C39 code present?

While the vehicle may still be drivable, the seatbelt pretensioner may not function during a collision, compromising safety. Prompt diagnosis and repair are recommended.

5. How is the B1C39 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the seatbelt pretensioner, and check the wiring and connectors for damage, corrosion, or loose connections.

6. Can I fix the B1C39 code myself?

If you have experience with automotive electrical systems, you can inspect for damaged wiring or loose connections. However, more complex repairs, like replacing the pretensioner, should be handled by a professional.

7. How much does it cost to repair the B1C39 code?

The repair cost varies depending on the issue. Replacing a seatbelt pretensioner can cost $200–$500, while simple wiring repairs may cost less.

8. Can a dead battery cause the B1C39 code?

A dead or weak battery may not directly cause this code but could contribute to electrical issues. Ensure the battery and charging system are working properly.

9. Do I need to replace the airbag control module if I have code B1C39?

Not necessarily. The airbag control module may only need replacement if diagnosed as faulty after ruling out wiring and pretensioner issues.

10. Will clearing the B1C39 code fix the problem?

Clearing the code without addressing the underlying issue will not fix the problem. The code will likely return if the fault persists.

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