NHTSA Complaint #11714188 — 2023 GMC SIERRA 1500

Vehicle: 2023 GMC [MODEL], Black Widow package, 6.2L L87, 41,078 miles Recall: 25V‑274 / GM [XXX] ; recall remedy performed by Marty’s GMC (Kingston, MA) on 2025 -11-12; oil changed per recall procedure Post‑remedy symptom: intermittent knock starting ~01 - 2025 / about two months after remedy Incident: Jan 23, 2026 — engine seized / loss of propulsion while driving; stranded on highway off‑ramp; vehicle impeding traffic causing dangerous conditions. Codes: OBD scan by passerby indicated camshaft position sensor / correlation error (exact code not captured) Crash/Injuries: none Current status: vehicle at Marty’s GMC since Jan 23; not diagnosed as of Jan 29; GMC case #88159466 Safety concern: sudden loss of motor power in traffic after recall remedy On Friday, Jan 23, 2026, while my daughter was driving, the engine seized / the vehicle lost propulsion and stranded her on a highway off‑ramp. The vehicle was impeding traffic and had to be moved. It restarted briefly and was moved to a safer location but still impeding traffic. A motorist scanned the OBD port and reported a camshaft position sensor / cam-crank correlation error (exact DTC unknown). No crash occurred and no injuries occurred. The vehicle has been at Marty’s GMC since Jan 23, 2026 and as of Jan 29, 2026 it has not yet been diagnosed. I opened a case with GMC Customer Assistance (case #XXX). This is a safety-related loss-of-propulsion event occurring after the recall remedy was completed. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)