B0021 2018 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 2018 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.
Code B0021 2018 GMC Sierra Description
What are the Possible Causes of the DTC B0021 2018 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 2018 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.
Code Tech Notes
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 2018 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 2018 GMC Sierra code?
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Need Help with the Code?
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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.
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