TSB PIT6400 — Cadillac, Chevrolet and GMC Service bulletin

PIT6400 is a service bulletin filed with NHTSA by Cadillac, Chevrolet and GMC, covering 8 Cadillac, Chevrolet and GMC models across the 2011–2019 model years. NHTSA's summary reads: This PI Communications information on an alternative product dealers can use to perform 19-NA-255: Wax Coating on Frame Peeling, Metal Shows Corrosion/Rusting due to issue with getting product from current supplier listed in the bulletin.

NHTSA's file names Cadillac Escalade (2011–2019); Chevrolet Avalanche (2011–2013); Chevrolet Silverado 1500 (2011–2014); Chevrolet Silverado 2500 (2011–2018); Chevrolet Suburban (2011–2018); Chevrolet Tahoe (2011–2018); GMC Sierra 1500 (2011–2014); GMC Yukon (2011–2014, 2018). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.

No. PIT6400 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.

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 PIT6400, its date, and NHTSA's own summary from the public file.