What Causes the Buzzing Sound When Pressing the Accelerator in a CVT Transmission?
2 Answers
Transmission noise during idle conditions indicates bearing wear inside the transmission. Below are other possible causes and solutions for abnormal sounds when accelerating: 1. Fuel Pump Motor Noise: When internal wear or contamination occurs in the fuel pump motor, abnormal sounds may occur during acceleration. This issue requires fuel pump replacement. 2. Throttle Body Noise: Modern throttle bodies use electronic control, with motors regulating valve movement. Gear wear in the motor can cause insufficient engagement and noise. Excessive carbon buildup or sludge in the throttle body may also generate noise. Cleaning the throttle body is recommended, while motor damage requires throttle body disassembly and servo motor replacement.
That buzzing sound does sound like gears grinding, doesn't it? I'm quite concerned about CVT transmissions. This kind of noise often occurs when pressing the accelerator because the load increases during acceleration. CVTs rely on steel belts or chains to transmit power, and if they're worn or loose, they can produce this kind of high-frequency noise. The fluid is also crucial—if it's deteriorated or low, insufficient lubrication causes components to grind against each other, making the buzzing sound more pronounced. If the torque converter has issues, the hydraulic system can also produce noise during operation. I suggest not delaying and heading to a professional shop for an inspection. Use diagnostic tools to read fault codes and check fluid pressure and levels. Drive gently in daily use—avoid stomping on the accelerator for rapid acceleration. CVTs last longer this way, otherwise, repairs could cost you thousands.
