TSB PIT6406K — Chevrolet and GMC Service bulletin
PIT6406K is a service bulletin on file with NHTSA for 4 Chevrolet and GMC models, 2022–2025 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. This Preliminary Information communicates direction for different audio issues with RPO UQA, UQF, UQS, or NKD
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years PIT6406K names
| Vehicle | Model years |
|---|---|
| Chevrolet Corvette | 2024, 2025 |
| Chevrolet Suburban | 2022, 2023 |
| Chevrolet Tahoe | 2022, 2023 |
| GMC Yukon | 2022, 2023 |
Every document filed under PIT6406K
| Document ID | Filed | Type |
|---|---|---|
| PIT6406K | May 14, 2026 | Service bulletin |
Questions buyers ask
What is TSB PIT6406K?
PIT6406K is a service bulletin filed with NHTSA by Chevrolet and GMC, covering 4 Chevrolet and GMC models across the 2022–2025 model years. NHTSA's summary reads: This Preliminary Information communicates direction for different audio issues with RPO UQA, UQF, UQS, or NKD
Which vehicles does PIT6406K cover?
NHTSA's file names Chevrolet Corvette (2024–2025); Chevrolet Suburban (2022–2023); Chevrolet Tahoe (2022–2023); GMC Yukon (2022–2023). 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 PIT6406K a recall, and is the repair free?
No. PIT6406K 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 PIT6406K?
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 PIT6406K, 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 PIT6406K. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.