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What are the reasons why the Buick Excelle cannot shift gears?

2 Answers

Brody

08/29/25 8:21am

Buick Excelle automatic transmission cannot shift gears due to mechanical failures in the transmission, such as metal shavings inside the transmission. If there are metal shavings in the transmission, it can cause mechanical faults in the transmission. For the Buick Excelle manual transmission, the inability to shift gears may be caused by excessively dirty transmission oil, which prevents the gear oil from achieving optimal viscosity and lubrication, ultimately leading to difficulty in shifting. The issue of the Buick Excelle automatic transmission not shifting gears can only be resolved by disassembling the transmission for inspection and repair. Apart from mechanical issues, transmission problems can also stem from electronic control issues. For example, damage to the transmission control module or communication failures between the body control system and the transmission control module can also result in the inability to shift gears. The solution for a manual transmission that cannot shift gears is to replace the transmission oil. There are two methods for changing transmission oil: the gravity method and the circulation machine method. The traditional gravity method for changing automatic transmission oil can only replace about half of the used oil. The process involves removing the drain plug, allowing the transmission oil to flow out naturally due to gravity, and then refilling the transmission oil through the fill port. The second method is the circulation machine oil change, which enables fully intelligent and equal-volume oil replacement while the vehicle is running. During this process, the oil circulates internally, carrying away contaminants inside the transmission, achieving a replacement rate of over 90%.

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LaGenevieve

09/11/25 5:49am

I've been driving a Buick Excelle for many years, and encountering difficulty in shifting gears is relatively common, mainly due to several reasons. For automatic transmissions, aging or insufficient transmission fluid can cause gear shifting to be jerky; failures in the electronic control system, such as software bugs in the control module or sensor malfunctions; or a stuck or rusted gear lever can also prevent movement. Manual transmissions are more obvious—when the clutch is severely worn, it may become completely impossible to engage gears. Once, my car couldn't shift gears during a cold start, but changing the transmission fluid solved the issue. It's recommended to regularly check the fluid and replace it every 40,000 kilometers; also, ensure proper operation, such as firmly pressing the brake to release the lock. Don't ignore this problem; address it promptly to prevent greater mechanical damage and safety risks, as losing control on the road is extremely dangerous.

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