The ZF-derived 948TE 9-speed can exhibit harsh or hesitant shifts, gear hunting, and a lag from Park to a drive gear. NHTSA has investigated an internal transmission wiring-connector short that can cause an unexpected engine/transmission shutdown. Early 2017 builds saw the most complaints; multiple software updates were issued.
Test drive through the full range: gentle 5–35 mph tip-in, a highway on-ramp, and several Park-to-Drive/Reverse engagements. Feel for clunks, flares, or a multi-second delay engaging a gear. Scan for transmission codes and confirm the latest TCM software is installed at a dealer (free VIN check).
Est. cost: $0 software / $350–$550 fluid service / $3,000–$5,000 valve body or unit if mechanical
Source: NHTSA stall investigation + FCA transmission software campaigns