TSB PIT6523 — Cadillac, Chevrolet and GMC Service bulletin

PIT6523 is a service bulletin filed with NHTSA by Cadillac, Chevrolet and GMC, covering 8 Cadillac, Chevrolet and GMC models across the 2020–2026 model years. NHTSA's summary reads: This PI provides diagnostic steps for dealer technicians to verify the condition and ensure that part replacement is necessary

NHTSA's file names Cadillac Escalade (2025–2026); Chevrolet Colorado (2023–2026); Chevrolet Silverado 1500 (2021–2026); Chevrolet Silverado 2500 (2020–2026); Chevrolet Suburban (2025–2026); Chevrolet Tahoe (2025–2026); GMC Canyon (2023–2026); GMC Sierra 1500 (2021–2026). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.

No. PIT6523 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 PIT6523, its date, and NHTSA's own summary from the public file.