Enhance your vehicle's performance with the ACDelco Engine Control Module, expertly remanufactured to meet high standards of quality and reliability. Precision Engineering: Each module is remanufactured to GM specifications, ensuring optimal compatibility and functionality for your vehicle. Reliable Performance: Designed to manage essential engine functions, this module helps improve fuel efficiency and overall engine operation. Quality Assurance: As part of the ACDelco GM Genuine Parts line, it guarantees durability and longevity for your Chevy, GMC, or Oldsmobile. Easy Installation: Sold individually, this module is straightforward to install, making it a convenient solution for your engine control needs. The ACDelco Engine Control Module (part number 21691) is a remanufactured component that seamlessly fits various GM vehicles, ensuring your engine runs smoothly.Trust ACDelco for dependable performance and quality in every drive.