B0021 on CHEVROLET IMPALA
Left Curtain Deployment Control 1
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Chevrolet model context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for B0021.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
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.
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."
"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."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on CHEVROLET IMPALA
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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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.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.