Fri, 17 Apr 2026 07:04:23 +0000

Your Silverado Sierra’s CP4 Pump Might Be Legal Nightmare Exposed Inside Lawsuit Clash If you own or are eyeing a 2023–2024 Chevrolet Silverado Sierra equipped with the CP4 weak deck pump, you may want to take a closer look — this seemingly standard engine component has become the center of a legal storm. Recent lawsuits and regulatory scrutiny have ignited concerns over whether the CP4 weak pump delivery system violates emissions and safety laws, potentially turning your trusted pickup’s upgrade into a costly legal dilemma. ### What Is the CP4 Weak Pump and Why Is It Controversial? The CP4 weak pump is part of General Motors’ evolution toward high-spec Silverado Sierra powertonage. Unlike earlier rigid or higher-flow pumps, the CP4 “weak” designation refers to a deliberately calibrated pressure reduction—primarily for better emissions compliance and fuel economy under specific conditions. However, this deliberate underperformance has now become a legal flashpoint.