TSB PIC6553B — Chevrolet Service bulletin
PIC6553B is a service bulletin on file with NHTSA for the Chevrolet Trailblazer, 2021–2023 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. This bulletin communicates to a dealer the repair direction that should be taken if they encounter a vibration from the engine when the vehicle is parked facing downhill.
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years PIC6553B names
| Vehicle | Model years |
|---|---|
| Chevrolet Trailblazer | 2021, 2022, 2023 |
Every document filed under PIC6553B
| Document ID | Filed | Type |
|---|---|---|
| PIC6553B | March 30, 2026 | Service bulletin |
Questions buyers ask
What is TSB PIC6553B?
PIC6553B is a service bulletin filed with NHTSA by Chevrolet, covering the Chevrolet Trailblazer across the 2021–2023 model years. NHTSA's summary reads: This bulletin communicates to a dealer the repair direction that should be taken if they encounter a vibration from the engine when the vehicle is parked facing downhill.
Which vehicles does PIC6553B cover?
NHTSA's file names Chevrolet Trailblazer (2021–2023). 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 PIC6553B a recall, and is the repair free?
No. PIC6553B 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 PIC6553B?
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 PIC6553B, 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 PIC6553B. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.