What Causes the Transmission Noise in the Envision?
3 Answers
Transmission noise can be caused by the following reasons: Wear and damage of bearings: When bearings wear out, the gap increases, and the fitting accuracy decreases. When bearings are damaged, abnormal noise occurs as they cannot operate normally, potentially leading to damage of transmission components and exacerbating the issue. This can also be caused by the wear of transmission components or the use of replacement parts with excessively low precision, such as gear wear or mismatched gear clearance. Insufficient or overly viscous lubrication oil leading to poor lubrication: In such cases, the corresponding lubricating oil (grease) should be replaced; otherwise, it will accelerate transmission wear and shorten its service life. Loose bolts on the transmission housing (end cover): Vibrations during operation can loosen bolts, so regular inspections are necessary.
As a seasoned driver with over a decade of experience, I'm telling you—never ignore transmission noises in your Buick Envision. Last year, I encountered similar issues: a distinct clicking sound during low-speed gear shifts. These noises most commonly indicate worn internal transmission components, particularly loose shift forks or planetary gears. It could also stem from blocked valve bodies causing unstable oil pressure, or deteriorated transmission fluid due to prolonged neglect. Metallic grinding noises are especially alarming, often signaling bearing or gear failures. Remember: never delay addressing these sounds. I strongly recommend visiting a professional repair shop immediately for OBD-II diagnostics. If necessary, disassemble the transmission to inspect critical components like synchronizers. Don't hesitate about costs—major transmission repairs can cost half the price of a used car.
My friend owns an auto repair shop specializing in transmissions. He told me there are three main causes of transmission noise in the Envision: First, fluid issues - low fluid level or degraded oil quality leading to insufficient lubrication and dry grinding sounds; second, mechanical component problems - damaged synchronizers causing gear grinding noises, or faulty bearings producing continuous humming; third, TCU control module failure, resulting in rough shifting and abnormal sounds. He recommends first checking the transmission fluid level - if the oil is dirty, replace it immediately to see if the noise persists. If the noise continues, a transmission teardown inspection is necessary, with special attention to the torque converter and clutch plates. Repairing these components can cost over ten thousand yuan, so delays are not advisable.
