What does the Buick Regal P2261 fault code mean?

[RubyLee]

P2261 fault code is generally caused by damage to the turbocharger bypass valve. Below are specific details about the turbocharger:1. Overview: The turbocharger is essentially an air compressor that increases intake air volume by compressing air. It utilizes the inertial force of exhaust gases expelled by the engine to drive the turbine in the turbine chamber, which in turn rotates the coaxial impeller. The impeller then pressurizes the air delivered through the air filter pipe, forcing it into the cylinders. As engine speed increases, the exhaust gas expulsion speed and turbine rotation speed also increase synchronously, allowing the impeller to compress more air into the cylinders. The increased air pressure and density enable the combustion of more fuel, and by correspondingly increasing fuel supply and adjusting engine speed, the engine's output power can be enhanced.2. Components and Principle: The exhaust gas turbocharger mainly consists of a pump wheel and a turbine, along with some other control components. The pump wheel and turbine are connected by a shaft, known as the rotor. The exhaust gases from the engine drive the pump wheel, which then rotates the turbine. The rotation of the turbine pressurizes the intake system.