General Motors agreed to a $35 million class action settlement over allegations that certain 2011–2016 Chevrolet Silverado and GMC Sierra diesel trucks with the 6.6L Duramax were equipped with Bosch CP4 high‑pressure fuel pumps that can fail catastrophically in U.S. driving conditions. Plaintiffs claimed the CP4 design is unusually sensitive to lubrication and contamination issues associated with U.S. diesel fuel, and that when the pump fails it can send metal debris through the fuel system—often requiring extensive, expensive repairs well beyond the pump itself. The case, *Chapman, et al. v. General Motors LLC* (E.D. Mich.), covers qualifying purchases from GM‑authorized dealers in selected states and provides a claims process with documentation requirements. The lawsuit was filed to recover costs for owners who say they were stuck with large out‑of‑pocket bills and diminished vehicle value due to an allegedly defective component built into the fuel injection system. The settlement structure reflects those harms: a $30 million “Repair Fund” aimed at reimbursing verified prior repair expenses (potentially several thousand dollars depending on claim volume) and a $5 million “Former Owner Fund” for people who sold their trucks without completing a covered repair (hundreds of dollars, again depending on participation). Its significance is that it turns a recurring reliability complaint into standardized compensation, while also spotlighting how a single component in modern high‑pressure common‑rail diesel systems can trigger systemwide damage and costs. More broadly, CP4 pump litigation has appeared across the diesel pickup market because many modern diesels use tightly engineered emissions and fuel‑delivery hardware that is less tolerant of fuel quality variation—an issue shaped by U.S. diesel specifications and additive/lubricity practices. In industry terms, these disputes sit at the intersection of warranty law, state consumer‑protection statutes, and the practical limits of “normal use” definitions when fuel characteristics and maintenance conditions vary; they also complement (rather than replace) the separate regulatory framework governing diesel emissions compliance under EPA and CARB rules, which has pushed higher injection pressures and more complex systems. Similar cases and settlements in the automotive sector often hinge on the same themes seen here—whether the manufacturer knew of an elevated failure risk, how widespread the issue was, and whether owners faced predictable, outsized repair costs that ordinary warranties didn’t adequately address.