B0021 2018 GMC Sierra Code - Passenger Seat Side Air Bag Deployment Loop
Quick Answer
The B0021 code on a 2018 GMC Sierra relates to an issue with the passenger seat side airbag deployment loop. Common causes include Damaged wiring in the airbag system, Faulty airbag deployment sensor, Loose connections in the airbag circuit. 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 2018 GMC Sierra indicates Passenger Seat Side Air Bag Deployment Loop.
- Common causes
- Common causes include Damaged wiring in the airbag system, Faulty airbag deployment sensor, Loose connections in the airbag circuit.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code B0021 2018 GMC Sierra Description
The B0021 code on a 2018 GMC Sierra relates to an issue with the passenger seat side airbag deployment loop. This code indicates that there is a problem with the circuit that controls the deployment of the airbag located in the passenger seat. The airbag system in a vehicle is a crucial safety feature designed to protect occupants in the event of a collision. When this code is triggered, it means that there is a fault in the system that could potentially prevent the airbag from deploying properly in a crash.
Common Causes of B0021 2018 GMC Sierra
- Damaged wiring in the airbag system
- Faulty airbag deployment sensor
- Loose connections in the airbag circuit
- Malfunctioning airbag module
- Impact or damage to the passenger seat area
Symptoms of B0021 2018 GMC Sierra
- Airbag warning light on the dashboard
- Passenger seat airbag light illuminated
- Inability to enable/disable passenger airbag
- The airbag may not deploy in a collision
How to Fix B0021 2018 GMC Sierra
- Begin by diagnosing the specific cause of the B0021 code using a diagnostic scanner to pinpoint the issue.
- Inspect the wiring and connections in the airbag system for any damage or loose connections.
- Test the airbag deployment sensor to ensure it is functioning correctly and replace if necessary.
- If the airbag module is faulty, it may need to be replaced to resolve the issue.
- Clear the code from the vehicle's system after completing the repairs and perform a test to ensure the airbag system is functioning properly.
Cost to Fix B0021 2018 GMC Sierra
The cost of repairing a B0021 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair could range from $200 to $500, including the replacement of components such as wiring, sensors, or the airbag module. Labor costs for this repair typically range from $150 to $300, with total repair costs averaging between $350 and $800. However, it's important to note that labor rates at auto repair shops can vary based on location and other factors, so it's advisable to get a specific estimate from a qualified mechanic.
Tech Notes for B0021 2018 GMC Sierra
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
Need more information about the B0021 2018 GMC Sierra code?
Need more information on how to fix the B0021 2018 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B0021 2018 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.
Frequently Asked Questions about B0021 2018 GMC Sierra Code
1. What does OBDII code B0021 for a 2018 GMC Sierra indicate?
- The B0021 code specifically refers to an issue with the passenger seat side airbag deployment loop.
2. What are common symptoms of OBDII code B0021 in a 2018 GMC Sierra?
- Common symptoms include the airbag warning light on the dashboard staying illuminated or flashing.
3. What are possible causes of OBDII code B0021 in a 2018 GMC Sierra?
- Causes may include a faulty passenger seat side airbag deployment loop, damaged wiring, or a malfunctioning airbag control module.
4. How can I diagnose the B0021 code in my 2018 GMC Sierra?
- Diagnosis involves using an OBDII scanner to retrieve the specific fault code and inspecting the passenger seat side airbag system for any visible damage or issues.
5. Can I continue driving my 2018 GMC Sierra with the B0021 code present?
- It is not recommended to drive with the B0021 code present, as it indicates a potential issue with the passenger seat side airbag system, which could compromise safety in the event of a collision.
6. What is the typical repair for OBDII code B0021 in a 2018 GMC Sierra?
- The repair may involve replacing the faulty passenger seat side airbag deployment loop, repairing damaged wiring, or reprogramming the airbag control module.
7. Can I fix the B0021 code in my 2018 GMC Sierra myself?
- While some DIY enthusiasts may attempt to address the issue themselves, it is recommended to seek professional help to ensure the airbag system is repaired correctly and safely.
8. Are there any safety precautions I should take when working on the passenger seat side airbag system?
- It is crucial to disconnect the vehicle's battery and wait for the specified amount of time to discharge any stored energy before working on the airbag system to prevent accidental deployment.
9. How much does it typically cost to repair the B0021 code in a 2018 GMC Sierra?
- The cost of repair can vary depending on the extent of the issue, parts needed, and labor rates, but it is advisable to consult a mechanic for an accurate estimate.
10. Will resetting the OBDII code B0021 in my 2018 GMC Sierra make the issue go away?
- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying problem causing the B0021 fault code to reappear.
Discuss the causes and fixes for B0021 2018 GMC Sierra OBDII Code
Code B0021 2018 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.