Common Problems With an Automatic TransmissionNoisy Transmission
It changes from car to car, due to the brand and the make, and your mechanic. But one thing is certain: if your car makes any kind of whining, whirring, buzzing, or clanging noises, there is something wrong with the transmission. Ignoring these noises only gives them a chance to grow louder.
Most transmission-related sounds occur at transition speeds. It happens during acceleration or deceleration in most cases, and idling in bad ones. The intensity determines the problem. It could be anything from a low amount of lubrication to chipped gears.
► Vehicle Not Moving
This one is a little tricky. The worst possible problem is a broken transmission system, because the only way to fix this is a transmission overhaul.
But a transmission dying out instantly, without giving any warning, happens very rarely. So if the problem occurs without any other signals (like noise or jerking when the gears change), chances are it could be something else, like the drive shaft, the cable connection to the gear shifter, or a broken bushing.
► Loose Transmission/Uneven Changing of Gears
If your car is not going into gear, or can't stay in it once shifted, it could be another sign of transmission failure. Another symptom is a jerk that you get when the gears shift. In harsh cases, it feels like you've been rear-ended every time the car shifts gear.
► Leaking Transmission Fluids/Foul Odors
This is one of the most common problems with any transmission system. The source of the problem can be found out by calculating the last time you changed your car's transmission fluids. If it was fairly recent, the leak could be because of loose joints or bolts around the drain plug or filters. If your car is old and the fluid hasn't been changed for quite some time, the problem could lie in the filters or the gaskets. They tend to get worn out after long-term use and start malfunctioning.
A slightly more rare cause is damage to the transmission housing by external factors such as rocks, speed bumps, potholes, or the sidewalk.
► The Check Engine Light
Never ignore it. You'll just be inviting more trouble if you do. There are two ways to assess the code. One is to check it online, through a legit code book. The book will only tell you which sensor is relaying the specific code, implying that the problem is related to that sensor. The other way is to get it checked directly at a mechanic's.
Maybe the CVT transmission kaput already for my case? Technician say already change ABCM, still car engine got problem...haih....