Automatic Transmission Control Module problems of the 2018 Subaru Impreza

Component & availability: the lineartronic continuously variable transmission (cvt) system suffered internal mechanical/hydraulic failure (tr580 unit). The vehicle and transmission assembly remain intact and available for immediate inspection upon request. Safety risk: the transmission experienced erratic downshifting, slipping, and failure of proper engagement, creating an imminent risk of sudden deceleration, complete loss of motive power, and stalling in traffic. After diagnostic codes were cleared during an independent reassembly, Subaru of America and its dealer (berman Subaru of chicago) refused to inspect or repair the defect, directing that the vehicle be driven until it re-fails and sets a light. Operating a vehicle with documented internal transmission failure until it stalls at highway speeds creates an severe hazard of rear-end collisions. Confirmation: the failure was confirmed on may 26, 2026, at 97,786 miles by licensed specialist a plus transmission specialists bellaire (houston, TX; ro #27012). Technicians verified downshift faults on road testing, performed electronic scans, dropped the pan, and disassembled components, documenting internal failure via logs and photos. Prior inspections: presented to dealer berman Subaru of chicago and Subaru of America customer advocacy; both refused to evaluate the physical transmission or teardown findings because the dash light was not currently lit. No police or insurance inspections. Symptoms & timeline: in may 2026, check engine and warning lights appeared alongside downshift malfunctions. Diagnostic scans captured tcm communication and powertrain faults (including c1431). Codes were cleared by the specialist during component reassembly and bench testing.