AutoCodes – Generic – B1086

B1086 Code - Front Pre-Tensioner Left Open

Quick Answer

In the case of a frontal collision that exceeds specified impact level, the diagnosis sensor unit detects the deceleration caused by the collision. Common causes include Faulty Front Pre-Tensioner Left, Front Pre-Tensioner Left harness is open or shorted, Front Pre-Tensioner Left circuit poor electrical connection. 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: B1086 indicates Front Pre-Tensioner Left Open.
Common causes: Common causes include Faulty Front Pre-Tensioner Left, Front Pre-Tensioner Left harness is open or shorted, Front Pre-Tensioner Left circuit poor electrical connection.
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.

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Code Popularity 9,340

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 18, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1086 Description

In the case of a frontal collision that exceeds specified impact level, the diagnosis sensor unit detects the deceleration caused by the collision. If restrains the passenger with seat belt easing the stress on passengers chest with load limiter.
The restraint system for front seat occupant consists of the pre-tensioner mechanism and load limiter mechanism.

OBDII Code B1086 - Front Pre-Tensioner Left Open - AutoCodes.com — B1086 Code - Front Pre-Tensioner Left Open

What does this mean?

What are the Possible Causes of the DTC B1086?

Faulty Front Pre-Tensioner Left
Front Pre-Tensioner Left harness is open or shorted
Front Pre-Tensioner Left circuit poor electrical connection

How to Fix the DTC B1086?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1086 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1086 code?

Need more information on how to fix the B1086 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1086 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1086 Ford — Air Distribution Damper Motor Circuit
B1086 Infiniti — Front Pre-Tensioner Left Open
B1086 Lincoln — Air Distribution Damper Motor Circuit
B1086 Mercury — Air Distribution Damper Motor Circuit
B1086 Nissan — Front Pre-Tensioner Left Open

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 B1086 Code

1. What are the common symptoms of OBDII code B1086 (Front Pre-Tensioner Left Open)?

- The common symptoms include the airbag warning light illuminating on the dashboard and a potential message indicating an issue with the front pre-tensioner on the left side.

2. What causes the OBDII code B1086 to trigger in a vehicle?

- The code B1086 is typically triggered when there is an open circuit in the front pre-tensioner on the left side, which could be due to a faulty wiring connection or a damaged pre-tensioner component.

3. How serious is the OBDII code B1086 (Front Pre-Tensioner Left Open)?

- This code indicates a potential safety issue with the front pre-tensioner on the left side, which is a crucial component of the vehicle's airbag system. It is essential to address this issue promptly to ensure proper airbag functionality in case of an accident.

4. Can I continue driving with the OBDII code B1086 present in my vehicle?

- It is not recommended to drive with the OBDII code B1086 active, as it signifies a problem with the front pre-tensioner on the left side, which may affect the proper deployment of the airbag in the event of a collision.

5. How can I diagnose and repair the OBDII code B1086 (Front Pre-Tensioner Left Open)?

- Diagnosis involves inspecting the wiring and connections related to the front pre-tensioner on the left side, checking for any visible damage or loose connections. Repair may involve repairing or replacing damaged wiring, connectors, or the pre-tensioner component itself.

6. Are there any DIY repair tips for addressing the OBDII code B1086?

- DIY repair for the OBDII code B1086 may be challenging due to the safety-critical nature of the front pre-tensioner system. It is recommended to seek professional assistance to ensure the issue is properly diagnosed and repaired.

7. How much does it typically cost to repair the OBDII code B1086 in a vehicle?

- The cost of repairing the OBDII code B1086 can vary depending on the extent of the damage and the specific vehicle model. It may involve costs for diagnostic time, parts, and labor, so it is advisable to get a professional assessment for an accurate estimate.

8. Can resetting the OBDII code B1086 clear the issue permanently?

- Resetting the OBDII code B1086 may temporarily clear the warning light, but if the underlying issue with the front pre-tensioner on the left side is not addressed, the code is likely to reappear. It is essential to diagnose and repair the root cause of the problem.

9. Is it safe to attempt to reset the OBDII code B1086 using an OBDII scanner?

- While resetting the code using an OBDII scanner is generally safe, it is crucial to remember that this action only clears the code without addressing the actual problem with the front pre-tensioner. Professional diagnosis and repair are recommended for safety reasons.

10. How long does it typically take to repair the OBDII code B1086 in a vehicle?

- The repair time for the OBDII code B1086 can vary depending on the extent of the issue and the availability of parts. Simple repairs may take a few hours, while more complex issues could require more time. It is best to consult with a professional technician for a more accurate estimate.