Why does the Envision 20T transmission produce abnormal noise?
3 Answers
If the interior of the transmission is dirty, or components such as bearings and gears are worn or severely worn, or there is damage to the gear side, abnormal noise from the transmission can be heard when the car is idling or under high load. Below are the methods to deal with abnormal noise in cars: 1. If there is abnormal noise from the engine while driving, but the noise persists when the engine is kept running during a stop inspection, you can loosen the carburetor adjustment needle slightly and then start the engine for testing. If the abnormal noise appears, its characteristics can be diagnosed. 2. If there is still no abnormal noise, you can disable a cylinder in advance and conduct a rapid acceleration test. This can both make the abnormal noise appear and determine the relationship between the noise and the cylinder position.
I drive a Buick Envision 20T model that has experienced transmission noise issues, which is quite annoying. Based on my experience, common causes include wear and tear of internal mechanical components in the transmission, such as aging gears or bearings, and prolonged high-load driving can accelerate this wear. Another reason could be insufficient or dirty transmission fluid, which reduces lubrication effectiveness and leads to friction noise. Additionally, if the electronic control unit malfunctions, it can affect shift precision and produce clunking sounds. I've found that regular fluid checks and maintenance can reduce such problems, but neglecting them might lead to major repairs and increased repair costs. The 20T turbocharged engine inherently places a heavier load on the transmission, making it more prone to failures. I recommend getting it diagnosed at a professional shop promptly and not delaying for convenience.
My Envision 20t makes a buzzing sound when shifting gears, which worries me about driving safety. I suspect the abnormal noise might be due to issues with the transmission oil pump or clutch plates, and poor oil quality could exacerbate the noise. Additionally, post-modification wiring interference or sensor malfunctions might also cause the noise. Hearing this sound every time I drive affects my mood, and my friend advised me to address it sooner. As mileage accumulates, parts naturally degrade, so it's important to use genuine fluids during maintenance to prevent more frequent noise. I tried checking it myself but realized professional tools were needed, so I sent it for repair immediately.
