AutoCodes – GMC – B0021 2014 GMC Sierra

B0021 2014 GMC Sierra Code - Passenger Seat Side Air Bag Deployment Loop

Quick Answer

A Diagnostic Trouble Code (DTC) will be stored in non-volatile memory if a malfunction is detected. Common causes include Faulty Passenger Seat Side Air Bag, Passenger Seat Side Air Bag harness is open or shorted, Passenger Seat Side Air 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: B0021 2014 GMC Sierra indicates Passenger Seat Side Air Bag Deployment Loop.
Common causes: Common causes include Faulty Passenger Seat Side Air Bag, Passenger Seat Side Air Bag harness is open or shorted, Passenger Seat Side Air 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 444

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 Oct 09, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0021 2014 GMC Sierra Description

A Diagnostic Trouble Code (DTC) will be stored in non-volatile memory if a malfunction is detected. 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 passenger seat side air bag. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. A shorting bar is used within the passenger seat side air bag connector which will short together both high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the air bag during servicing.

OBDII Code B0021 2014 GMC Sierra - Passenger Seat Side Air Bag Deployment Loop - AutoCodes.com — B0021 2014 GMC Sierra Code - Passenger Seat Side Air Bag Deployment Loop

What does this mean?

What are the Possible Causes of the DTC B0021 2014 GMC Sierra?

Faulty Passenger Seat Side Air Bag
Passenger Seat Side Air Bag harness is open or shorted
Passenger Seat Side Air Bag circuit poor electrical connection
Faulty Sensing and Diagnostic Module (SDM)

How to Fix the DTC B0021 2014 GMC Sierra?

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

B0021:01 Passenger Seat Side Air Bag Deployment Loop Short to Battery
B0021:02 Passenger Seat Side Air Bag Deployment Loop Short to Ground
B0021:04 Passenger Seat Side Air Bag Deployment Loop Open
B0021:0D Passenger Seat Side Air Bag Deployment Loop High Resistance
B0021:0E Passenger Seat Side Air Bag Deployment Loop Low Resistance

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0021 2014 GMC Sierra 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 B0021 2014 GMC Sierra code?

Need more information on how to fix the B0021 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0021 2014 GMC Sierra 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 B0021 2014 GMC Sierra Code

1. What does OBDII code B0021 for a 2014 GMC Sierra indicate?

The B0021 code specifically relates to the Passenger Seat Side Air Bag Deployment Loop circuit.

2. What are the common symptoms of a B0021 OBDII code in a 2014 GMC Sierra?

Common symptoms may include the airbag warning light illuminating on the dashboard and potential issues with the passenger seat side airbag deployment system.

3. What are some possible causes of the B0021 OBDII code in a 2014 GMC Sierra?

Potential causes of the B0021 code can include faulty wiring in the airbag deployment loop, a malfunctioning airbag sensor, or a problem with the airbag control module.

4. How can I diagnose the B0021 OBDII code in my 2014 GMC Sierra?

Diagnosing the B0021 code typically involves using a diagnostic scanner to retrieve the specific fault code and then inspecting the passenger seat side airbag deployment loop circuit for any visible damage or issues.

5. Is it safe to drive my 2014 GMC Sierra with the B0021 OBDII code?

It is not recommended to drive the vehicle with an active airbag fault code, as it may compromise the effectiveness of the passenger seat side airbag system in the event of a collision.

6. Can I reset the B0021 OBDII code in my 2014 GMC Sierra myself?

While you can clear the code using a diagnostic scanner, it is important to address the underlying issue causing the fault code before resetting it to ensure the safety of the airbag system.

7. How much does it typically cost to repair the B0021 OBDII code in a 2014 GMC Sierra?

The cost of repairing the B0021 code can vary depending on the exact cause of the issue, but it may involve replacing damaged wiring, sensors, or the airbag control module.

8. Are there any recalls or service bulletins related to the B0021 OBDII code in a 2014 GMC Sierra?

It is advisable to check with a GMC dealership or visit the NHTSA website to see if there are any recalls or service bulletins related to the B0021 code for your specific vehicle.

9. Can I still pass a state inspection with the B0021 OBDII code present in my 2014 GMC Sierra?

State inspection requirements vary, but having an active airbag fault code like B0021 may result in a failed inspection due to safety concerns.

10. How can I prevent the B0021 OBDII code from reoccurring in my 2014 GMC Sierra?

To prevent the B0021 code from reoccurring, it is essential to address any underlying issues promptly, perform regular maintenance checks on the airbag system, and avoid any physical damage to the airbag deployment loop circuit.