B0021 on CHEVROLET IMPALA — Left Curtain Deployment Control 1

Q: "What does B0021 mean on a CHEVROLET IMPALA?"

"B0021 indicates: Left Curtain Deployment Control 1. This is a body electrical code. 2 CHEVROLET IMPALA owners have reported this to NHTSA."

Q: "What are the most common causes of B0021 on CHEVROLET IMPALA?"

"Based on 2 NHTSA reports, the most commonly cited components are: Air Bags, Electrical System,Air Bags. These percentages are based on the component field in owner complaints."

Q: "Is B0021 serious on my CHEVROLET IMPALA?"

"Of 2 NHTSA reports for this code on CHEVROLET IMPALA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my CHEVROLET IMPALA shows B0021?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What B0021 Means on Your CHEVROLET IMPALA

B0021 is a diagnostic trouble code indicating: Left Curtain Deployment Control 1. This code relates to the body electrical system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

2 CHEVROLET IMPALA owners have reported this issue to NHTSA across model years 2009. Most reports come from the 2009 model year. The most commonly reported component is Air Bags (50.0% of reports).

Real CHEVROLET IMPALA Owner Reports

Source: NHTSA Complaints Database

"Car has had service air bag light on for years prior to being inherited. 4 codes were pulled inlcuding: 1. b0021 passenger seat side air bag deployment loop open. 2. b001b passenger pretensioner deployment loop 2 open. 3. b001b passenger pretensioner deployment loop 2 high resistance 4."

— 2009 CHEVROLET IMPALA owner · AIR BAGS · Filed 11/07/2020

"I took my car to auto mall in brattleboro vt for the recall 36110 passenger seat occupant sensing. they had it all day said they fixed it but the airbag light is on and it still doesn't sense anyone in the passenger side seat."

— 2009 CHEVROLET IMPALA owner · ELECTRICAL SYSTEM,AIR BAGS · Filed 08/17/2016

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

2

'09

Common Causes on CHEVROLET IMPALA

Based on NHTSA complaint component analysis for this vehicle.

AIR BAGS 50%

ELECTRICAL SYSTEM,AIR BAGS 50%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does B0021 mean on a CHEVROLET IMPALA? ▾

B0021 indicates: Left Curtain Deployment Control 1. This is a body electrical code. 2 CHEVROLET IMPALA owners have reported this to NHTSA.

What are the most common causes of B0021 on CHEVROLET IMPALA? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Air Bags, Electrical System,Air Bags. These percentages are based on the component field in owner complaints.

Is B0021 serious on my CHEVROLET IMPALA? ▾

Of 2 NHTSA reports for this code on CHEVROLET IMPALA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my CHEVROLET IMPALA shows B0021? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.

B0021 on Other Vehicles

→ All codes reported on CHEVROLET IMPALA