AutoCodes – Generic – B0068

B0068 Code - Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range

Quick Answer

The driver roof rail deployment loop consists of an inflatable restraint roof rail module - left and the roof rail module high and low circuits. Common causes include Faulty Left Front/Driver Roof Rail/Head Curtain Bag, Left Front/Driver Roof Rail/Head Curtain Bag harness is open or shorted, Left Front/Driver Roof Rail/Head Curtain Bag 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: B0068 indicates Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range.
Common causes: Common causes include Faulty Left Front/Driver Roof Rail/Head Curtain Bag, Left Front/Driver Roof Rail/Head Curtain Bag harness is open or shorted, Left Front/Driver Roof Rail/Head Curtain Bag 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 1,420

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0068 Description

The driver roof rail deployment loop consists of an inflatable restraint roof rail module - left and the roof rail module high and low circuits. A shorting bar used within the roof rail module connector shorts together both the roof rail module high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing. During a side or 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 roof rail module. 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 B0068 - Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range - AutoCodes.com — B0068 Code - Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range

What does this mean?

What are the Possible Causes of the DTC B0068?

Faulty Left Front/Driver Roof Rail/Head Curtain Bag
Left Front/Driver Roof Rail/Head Curtain Bag harness is open or shorted
Left Front/Driver Roof Rail/Head Curtain Bag circuit poor electrical connection
Faulty Sensing and Diagnostic Module (SDM)

How to Fix the DTC B0068?

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 B0068 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 B0068 code?

Need more information on how to fix the B0068 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0068 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0068 Buick — Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range
B0068 Cadillac — Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range
B0068 Chevrolet — Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range
B0068 GMC — Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range

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 B0068 Code

1. What are the common symptoms of OBDII code B0068?

When OBDII code B0068 (Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range) is present, common symptoms may include the airbag warning light illuminating on the dashboard and potential issues with the left front/driver side roof rail/head curtain airbag system.

2. What can cause OBDII code B0068 to be triggered?

OBDII code B0068 can be triggered by issues such as a faulty impact sensor, a damaged airbag module, wiring problems, or a malfunctioning airbag deployment loop on the left front/driver side of the vehicle.

3. How serious is OBDII code B0068?

OBDII code B0068 is a serious issue as it relates to the functionality of the left front/driver side roof rail/head curtain airbag system. It is crucial to address this code promptly to ensure the proper operation of the airbag system in the event of a collision.

4. Can I continue driving with OBDII code B0068 present?

It is not recommended to continue driving with OBDII code B0068 present, as it indicates a potential problem with the airbag system on the left front/driver side of the vehicle. Driving with this code unresolved may compromise the safety features of the airbag system.

5. How can OBDII code B0068 be diagnosed?

Diagnosing OBDII code B0068 typically involves using a diagnostic scanner to retrieve the specific fault code and then conducting a thorough inspection of the left front/driver side airbag components, including sensors, wiring, and the airbag module.

6. What are some repair tips for OBDII code B0068?

Repairing OBDII code B0068 may involve inspecting and repairing or replacing damaged wiring, sensors, or the airbag module on the left front/driver side of the vehicle. It is recommended to follow the manufacturer's diagnostic and repair procedures.

7. Can resetting the OBDII system clear code B0068?

Resetting the OBDII system may temporarily clear code B0068, but if the underlying issue causing the fault code is not addressed, the code is likely to reappear. It is essential to diagnose and repair the root cause of the problem.

8. How much does it cost to fix OBDII code B0068?

The cost of fixing OBDII code B0068 can vary depending on the specific cause of the issue and the extent of the repairs needed. Costs may include parts, labor, and diagnostic fees, so it is advisable to obtain estimates from a qualified mechanic or dealership.

9. Are there any safety concerns associated with OBDII code B0068?

Yes, there are safety concerns associated with OBDII code B0068, as it indicates a potential malfunction in the airbag system on the left front/driver side of the vehicle. It is important to address this code promptly to ensure the proper operation of the airbag system in case of an accident.

10. Can I fix OBDII code B0068 myself?

While some DIY enthusiasts may have the skills to diagnose and repair OBDII code B0068, working on airbag systems can be complex and dangerous. It is recommended to consult a professional mechanic or dealership with experience in handling airbag-related issues to ensure the problem is resolved correctly and safely.