AutoCodes – Chevrolet – B0066 Chevrolet

B0066 Chevrolet Code - Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range

Quick Answer

The driver seat belt pretensioner deployment loop consists of a seat belt pretensioner - LF and the seat belt pretensioner - LF high and low circuits. Common causes include Faulty Left Front/Driver Pretensioner, Left Front/Driver Pretensioner harness is open or shorted, Left Front/Driver Pretensioner 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: B0066 Chevrolet indicates Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range.
Common causes: Common causes include Faulty Left Front/Driver Pretensioner, Left Front/Driver Pretensioner harness is open or shorted, Left Front/Driver Pretensioner 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 2,342

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 Sep 28, 2020

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B0066 Chevrolet Description

The driver seat belt pretensioner deployment loop consists of a seat belt pretensioner - LF and the seat belt pretensioner - LF high and low circuits. A shorting bar used within the seat belt pretensioner connector shorts together both the seat belt pretensioner high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the pretensioner during servicing. During a frontal crash of sufficient force the inflatable restraint Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop in order to deploy the seat belt pretensioner. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a Diagnostic Trouble Code (DTC) will be stored in memory.

OBDII Code B0066 Chevrolet - Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range - AutoCodes.com — B0066 Chevrolet Code - Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range

What does this mean?

What are the Possible Causes of the DTC B0066 Chevrolet?

Faulty Left Front/Driver Pretensioner
Left Front/Driver Pretensioner harness is open or shorted
Left Front/Driver Pretensioner circuit poor electrical connection
Faulty Sensing and Diagnostic Module (SDM)

How to Fix the DTC B0066 Chevrolet?

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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0066 Chevrolet 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 B0066 Chevrolet code?

Need more information on how to fix the B0066 Chevrolet code? Get Access to Factory Service Manuals

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Get the B0066 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 B0066 Chevrolet Code

1. What are the common symptoms of OBDII code B0066 in a Chevrolet related to the Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range?

- The common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the driver's side seatbelt pretensioner.

2. What could cause the OBDII code B0066 in a Chevrolet to trigger?

- The code B0066 usually triggers due to a fault in the left front/driver pretensioner deployment loop, which may be caused by wiring issues, a faulty pretensioner, or a problem with the airbag control module.

3. How can I diagnose the OBDII code B0066 in my Chevrolet?

- Diagnosing code B0066 typically involves using a scan tool to retrieve the specific fault codes, inspecting the wiring and connections of the left front/driver pretensioner deployment loop, and testing the pretensioner's resistance.

4. Is it safe to drive my Chevrolet with the OBDII code B0066 active?

- It is not recommended to drive the vehicle with an active B0066 code, as it indicates a potential issue with the driver's side seatbelt pretensioner, which is a critical safety component in the event of a collision.

5. Can I reset the OBDII code B0066 in my Chevrolet without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of the problem to ensure the proper functioning of the driver's side seatbelt pretensioner and the overall safety of the vehicle.

6. What are some repair tips for fixing the OBDII code B0066 in a Chevrolet?

- Repair tips may include checking and repairing any damaged wiring, replacing the faulty left front/driver pretensioner deployment loop component, and ensuring all connections are secure and properly functioning.

7. How much does it typically cost to repair the OBDII code B0066 in a Chevrolet?

- Repair costs for code B0066 can vary depending on the specific issue, but expenses may include parts replacement, labor costs, and potential diagnostic fees. It is recommended to consult a professional mechanic for an accurate estimate.

8. Can a DIY enthusiast fix the OBDII code B0066 in a Chevrolet?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, addressing the OBDII code B0066 may require specialized tools and expertise, so it is advisable to seek professional help for proper diagnosis and repair.

9. Are there any recalls or service bulletins related to the OBDII code B0066 in Chevrolet vehicles?

- It is recommended to check with the manufacturer or a Chevrolet dealership for any recalls or service bulletins related to code B0066, as they may offer solutions or assistance in addressing this issue.

10. How important is it to address the OBDII code B0066 in a Chevrolet promptly?

- Addressing code B0066 promptly is crucial for maintaining the safety and functionality of the driver's side seatbelt pretensioner system, ensuring it operates correctly in case of an accident.