TSB PIT6522 — Cadillac, Chevrolet and GMC Service bulletin

PIT6522 is a service bulletin filed with NHTSA by Cadillac, Chevrolet and GMC, covering 10 Cadillac, Chevrolet and GMC models across the 2021–2026 model years. NHTSA's summary reads: This PI advises dealers that if the K160 Brake System Control Module sets DTC P0606 along with P0562 and/or P25A2, additional diagnostic aids should be followed before replacing parts. The PI provides guidance to inspect for low voltage conditions, wiring, terminal concerns, and…

NHTSA's file names Cadillac Escalade (2021–2026); Chevrolet Colorado (2023–2026); Chevrolet Silverado 1500 (2022–2026); Chevrolet Silverado 2500 (2022–2026); Chevrolet Suburban (2024); Chevrolet Tahoe (2021–2025); GMC Acadia (2024–2025); GMC Canyon (2023–2026); GMC Sierra 1500 (2022–2026); GMC Yukon (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. PIT6522 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 PIT6522, its date, and NHTSA's own summary from the public file.