OBD-II Code Decoder
Search the licensed P, B, C, and U reference library by code, definition, system, or manufacturer. Reference-only results are not a complete diagnosis.
Review-withheld definitions are excluded; lookup records are not published diagnostic pages.
P0621 — vehicles with official records naming this code
P0621 is named in NHTSA-published manufacturer communications or investigations for 12 vehicle families, including:
- Buick Encore GX model years 2024-2025 · 4 records
- Chevrolet Trailblazer model years 2024-2025 · 4 records
- Chevrolet Silverado model years 2001-2004 · 4 records
- GMC Sierra model years 2001-2004 · 4 records
- Chevrolet Malibu model years 2004, 2014-2015 · 3 records
- Buick Envista model years 2024-2025 · 2 records
- Chevrolet Trax model years 2024-2025 · 2 records
- Chevrolet Colorado model years 2004 · 1 record
- Chevrolet Impala model years 2015 · 1 record
- GMC Canyon model years 2004 · 1 record
A code named in a manufacturer communication means the document refers to it for those vehicles. It is not a diagnosis of any car, and it does not mean the code is common on that vehicle.
Matching definitions: 1 · Unique codes: 1.
| Code | Meaning | System | Scope | Manufacturer | Severity |
|---|---|---|---|---|---|
| P0621 | Generator Lamp/L Terminal Circuit | Powertrain | Generic | Not manufacturer-specific | Not classified |
No matching codes
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