再次请教： 车子换了 transmission fluid, 现在的情况是

车子启动后，一挂 R （倒车）挡，车子 “噌”地抖一下，就一下！然后车子可以倒车。换D 或 N 挡，没有问题

何解？ 多谢！ 

Update: 

1. 刚才又试了下， 挂D挡也有 "噌”地抖一下, 但比挂 R 挡要轻微些。 

2. check with Autel AL319, 没有 Red LED 亮, 但黄色 LED 是亮的。

“ YELLOW LED – Indicates there is a possible problem. A “Pending”DTC is present and/or some of the vehicle’s emission monitors have not run their diagnostic testing.