TSB PIC6423A — Buick, Cadillac, Chevrolet and GMC Service bulletin
PIC6423A is a service bulletin on file with NHTSA for 21 Buick, Cadillac, Chevrolet and GMC models, 2021–2026 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. Pi created to provide GM dealers with information on gathering information for projection issue
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years PIC6423A names
| Vehicle | Model years |
|---|---|
| Buick Enclave | 2021, 2022, 2023, 2024, 2025, 2026 |
| Cadillac Escalade | 2021, 2022, 2023 |
| Chevrolet Blazer | 2021, 2022, 2023, 2024, 2025, 2026 |
| Chevrolet Bolt EV | 2021, 2022, 2023 |
| Chevrolet Camaro | 2021, 2022, 2023, 2024 |
| Chevrolet Colorado | 2021, 2022, 2023 |
| Chevrolet Corvette | 2021, 2022, 2023, 2024, 2025 |
| Chevrolet Equinox | 2021, 2022, 2023, 2024, 2025 |
| Chevrolet Malibu | 2021, 2022, 2023, 2024, 2025 |
| Chevrolet Silverado 1500 | 2021 |
| Chevrolet Silverado 2500 | 2021, 2022, 2023 |
| Chevrolet Suburban | 2021, 2022 |
| Chevrolet Tahoe | 2021, 2022 |
| Chevrolet Trailblazer | 2021, 2022, 2023, 2024, 2025 |
| Chevrolet Traverse | 2021, 2022, 2023, 2024, 2025, 2026 |
| Chevrolet Trax | 2021, 2022, 2024, 2025, 2026 |
| GMC Acadia | 2021, 2022, 2023, 2024, 2025 |
| GMC Canyon | 2021, 2022, 2023 |
| GMC Sierra 1500 | 2021 |
| GMC Terrain | 2021, 2022, 2023, 2024, 2025 |
| GMC Yukon | 2021, 2022 |
Every document filed under PIC6423A
| Document ID | Filed | Type |
|---|---|---|
| PIC6423A | May 11, 2026 | Service bulletin |
Questions buyers ask
What is TSB PIC6423A?
PIC6423A is a service bulletin filed with NHTSA by Buick, Cadillac, Chevrolet and GMC, covering 21 Buick, Cadillac, Chevrolet and GMC models across the 2021–2026 model years. NHTSA's summary reads: Pi created to provide GM dealers with information on gathering information for projection issue
Which vehicles does PIC6423A cover?
NHTSA's file names Buick Enclave (2021–2026); Cadillac Escalade (2021–2023); Chevrolet Blazer (2021–2026); Chevrolet Bolt EV (2021–2023); Chevrolet Camaro (2021–2024); Chevrolet Colorado (2021–2023); Chevrolet Corvette (2021–2025); Chevrolet Equinox (2021–2025); Chevrolet Malibu (2021–2025); Chevrolet Silverado 1500 (2021), and 11 more vehicles listed on this page. A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB PIC6423A a recall, and is the repair free?
No. PIC6423A is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of PIC6423A?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under PIC6423A, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under PIC6423A. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.