AutoCodes – Cadillac – B0066 Cadillac

B0066 Cadillac 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 Cadillac 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 2,141

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

What does this mean?

What are the Possible Causes of the DTC B0066 Cadillac?

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 Cadillac?

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

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0066 Cadillac 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 Cadillac code?

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

Need Help with the Code?

Get the B0066 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code B0066 in a Cadillac?

The common symptoms include the airbag warning light staying on, potential non-deployment of the driver's side airbag in the event of a collision, and possibly the vehicle failing a state inspection.

2. What can cause the Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range code in a Cadillac?

This code can be triggered by issues such as damaged wiring, a faulty pretensioner, a loose connection, or a problem with the airbag module.

3. How serious is the B0066 OBDII code in a Cadillac?

This code indicates a potential safety issue as it pertains to the driver's side airbag system. It is important to address this code promptly to ensure the proper functioning of the airbag in case of an accident.

4. Can I still drive my Cadillac with the B0066 code present?

It is not recommended to drive the vehicle with the B0066 code present, as it indicates a problem with the driver's side airbag system. Driving with this issue unresolved could compromise your safety in the event of a collision.

5. How can I diagnose and repair the B0066 OBDII code in my Cadillac?

Diagnosing and repairing this code typically involves inspecting the wiring, connectors, and pretensioner for any damage or issues. It may also require resetting the airbag system and clearing the code with a diagnostic tool.

6. Is it safe to reset the B0066 code in a Cadillac without fixing the underlying issue?

Resetting the code without addressing the root cause, such as a faulty pretensioner or damaged wiring, is not recommended. It is important to diagnose and repair the issue to ensure the proper functioning of the airbag system.

7. How much does it cost to repair the B0066 code in a Cadillac?

The cost of repairing the B0066 code can vary depending on the underlying issue. It may involve replacing a faulty pretensioner, repairing damaged wiring, or addressing a problem with the airbag module. Costs can range from a few hundred to over a thousand dollars.

8. Can I fix the B0066 OBDII code in my Cadillac myself?

While some DIY enthusiasts may attempt to diagnose and repair the B0066 code on their own, it is recommended to seek professional help, especially when dealing with safety-critical systems like the airbag. A qualified mechanic or technician can ensure the issue is properly addressed.

9. Will the B0066 code in a Cadillac reset on its own?

The B0066 code will not reset on its own. It needs to be diagnosed, repaired, and then cleared with a diagnostic tool to reset the system and turn off the warning light.

10. How long does it typically take to repair the B0066 code in a Cadillac?

The repair time for the B0066 code can vary depending on the exact cause of the issue and the availability of parts. It may take a few hours to a full day to diagnose, repair, and reset the code.