Integrally injection molded with thickened high-quality engineering plastic, the shell is firm, impact-resistant and compression-resistant with great dustproof, waterproof, oil-proof and anti-corrosion performance. Close fitting design and firm buckle structure prevent loosening caused by driving vibration. It fully protects internal core controller components from collision, moisture and electromagnetic interference, extending service life and ensuring stable operation of gearbox electric control system. It is applicable to all ZF 12-speed and 16-speed heavy commercial vehicle gearboxes.