AutoCodes – GMC – B0068 GMC

B0068 GMC 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 GMC 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 1,219

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 GMC 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 GMC - Left Front/Driver Roof Rail/Head Curtain Bag Deployment Loop Voltage Out of Range - AutoCodes.com — B0068 GMC 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 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the B0068 GMC 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 B0068 GMC Code

1. What are the common symptoms of OBDII code B0068 in a GMC vehicle?

- Common symptoms of OBDII code B0068 include the airbag warning light being illuminated on the dashboard, along with a potential message indicating an issue with the left front/driver roof rail/head curtain bag deployment loop.

2. What can cause the OBDII code B0068 to occur in a GMC vehicle?

- The OBDII code B0068 in a GMC vehicle can be triggered by issues such as a faulty deployment loop, wiring problems, a bad airbag sensor, or a malfunction in the airbag control module.

3. How serious is the OBDII code B0068 in a GMC vehicle?

- The OBDII code B0068 related to the left front/driver roof rail/head curtain bag deployment loop voltage out of range is a serious issue as it indicates a potential problem with the airbag system, which is a crucial safety feature in the vehicle.

4. Can I continue driving my GMC vehicle with the OBDII code B0068 present?

- It is not recommended to continue driving your GMC vehicle with the OBDII code B0068 present, as it indicates a fault in the airbag system, which may compromise its functionality in the event of a collision.

5. How can the OBDII code B0068 in a GMC vehicle be diagnosed?

- To diagnose the OBDII code B0068 in a GMC vehicle, a professional technician can use a diagnostic scanner to retrieve the specific fault code and then perform further testing to pinpoint the exact cause of the issue.

6. Are there any DIY repair tips for fixing the OBDII code B0068 in a GMC vehicle?

- DIY repair for the OBDII code B0068 is not recommended due to the complexity and safety implications of working on the airbag system. It is best to consult a qualified mechanic for proper diagnosis and repair.

7. How much does it typically cost to repair the OBDII code B0068 in a GMC vehicle?

- The cost of repairing the OBDII code B0068 in a GMC vehicle can vary depending on the underlying cause of the issue. It is advisable to get a professional diagnosis to determine the exact repair cost.

8. Can resetting the OBDII code B0068 in a GMC vehicle make it go away permanently?

- Simply resetting the OBDII code B0068 in a GMC vehicle may temporarily turn off the warning light, but the underlying issue causing the fault will still remain. It is essential to address the root cause of the problem for a permanent fix.

9. Is it safe to ignore the OBDII code B0068 in a GMC vehicle if the airbags seem to be working fine?

- It is not safe to ignore the OBDII code B0068 in a GMC vehicle, even if the airbags appear to be functioning properly. The code indicates a potential fault in the system that could lead to airbag failure in a collision.

10. How long does it typically take to repair the OBDII code B0068 in a GMC vehicle?

- The repair time for the OBDII code B0068 in a GMC vehicle can vary depending on the exact cause of the issue and the availability of parts. In general, it may take a few hours to a day to diagnose and repair the problem.