TSB 07-08-42-006U — Chevrolet and GMC Service bulletin
07-08-42-006U is a service bulletin on file with NHTSA for 2 Chevrolet and GMC models, 2007–2014 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. This service bulletin provides technicians with information on available BCM calibrations to restore bulb outage detection on vehicles produced by a second stage manufacturer (Upfitter), and/or turn signals flash fast after factory box removed.
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 07-08-42-006U names
| Vehicle | Model years |
|---|---|
| Chevrolet Silverado 1500 | 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 |
| GMC Sierra 1500 | 2007, 2008, 2009, 2010, 2011, 2012, 2013 |
Every document filed under 07-08-42-006U
| Document ID | Filed | Type |
|---|---|---|
| 07-08-42-006U | June 2, 2025 | Service bulletin |
What 07-08-42-006U covers
Electrical — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 07-08-42-006U?
07-08-42-006U is a service bulletin filed with NHTSA by Chevrolet and GMC, covering 2 Chevrolet and GMC models across the 2007–2014 model years. NHTSA's summary reads: This service bulletin provides technicians with information on available BCM calibrations to restore bulb outage detection on vehicles produced by a second stage manufacturer (Upfitter), and/or turn signals flash fast after factory box removed.
Which vehicles does 07-08-42-006U cover?
NHTSA's file names Chevrolet Silverado 1500 (2007–2014); GMC Sierra 1500 (2007–2013). 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 07-08-42-006U a recall, and is the repair free?
No. 07-08-42-006U 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 07-08-42-006U?
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 07-08-42-006U, 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 07-08-42-006U. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.