TSB PIT6483 — Cadillac, Chevrolet and GMC Service bulletin
PIT6483 is a service bulletin on file with NHTSA for 7 Cadillac, Chevrolet and GMC models, 2014–2020 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 an issue with aftermarket LED headlights causing IPC warning messages and MIL along with several low speed lan DTCs.
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years PIT6483 names
| Vehicle | Model years |
|---|---|
| Cadillac Escalade | 2015, 2016, 2017, 2018, 2019, 2020 |
| Chevrolet Silverado 1500 | 2015, 2016, 2017, 2018 |
| Chevrolet Silverado 2500 | 2015, 2016, 2017, 2018, 2019 |
| Chevrolet Suburban | 2015, 2016, 2017, 2018, 2019, 2020 |
| Chevrolet Tahoe | 2015, 2016, 2017, 2018, 2019, 2020 |
| GMC Sierra 1500 | 2014, 2015, 2016, 2017, 2018 |
| GMC Yukon | 2015, 2016, 2017, 2018, 2019, 2020 |
Every document filed under PIT6483
| Document ID | Filed | Type |
|---|---|---|
| PIT6483 | February 5, 2026 | Service bulletin |
Questions buyers ask
What is TSB PIT6483?
PIT6483 is a service bulletin filed with NHTSA by Cadillac, Chevrolet and GMC, covering 7 Cadillac, Chevrolet and GMC models across the 2014–2020 model years. NHTSA's summary reads: This preliminary information communicates an issue with aftermarket LED headlights causing IPC warning messages and MIL along with several low speed lan DTCs.
Which vehicles does PIT6483 cover?
NHTSA's file names Cadillac Escalade (2015–2020); Chevrolet Silverado 1500 (2015–2018); Chevrolet Silverado 2500 (2015–2019); Chevrolet Suburban (2015–2020); Chevrolet Tahoe (2015–2020); GMC Sierra 1500 (2014–2018); GMC Yukon (2015–2020). 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 PIT6483 a recall, and is the repair free?
No. PIT6483 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 PIT6483?
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 PIT6483, 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 PIT6483. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.