1. Oil seeps out of the transmission case or oil pan, one reason is due to aging of the seals, bad sealing, need to replace the seals;
Transmission oil mainly plays the roles of lubrication, cleaning, temperature reduction, rust prevention and sealing, if the transmission lacks oil, it will result in insufficient lubrication inside the transmission, and it will be scrapped after a long time of dry grinding.

2. Slow or stuck in gear and shock feeling
Start the engine, idle, press the brake, shift into gear, the normal situation is 1-1.2 seconds to have the feeling of shifting into gear, let go of the brake pedal, in the case of not stepping on the gas pedal, the vehicle will start slowly and gradually extracted to the speed of 10-20 km / h. If more than 2 seconds after shifting into gear, it is delayed or stuck and shock. If it takes more than 2 seconds after shifting into gear, it is delayed shifting and needs to be serviced immediately.
Gear shock, any automatic transmission into gear has a certain degree of impact, if there is no feeling, but that there is an internal fault. But the impact is relatively large to check and clean the valve body
Into gear dead fire, this problem is more obvious in the cold car, triggered by this problem have transmission problems and other body system problems.
3. Put into any gear, the car does not move, can not be driven
The car can run for a short while after cold start, but it can't run under hot condition. This situation is mostly caused by damage to the input shaft or reverse gear clutch, or damage to the D/R brake. It is also possible that the automatic transmission is seriously short of oil;
The linkage or cable between the shift lever and the manual valve rocker arm is loose, and the manual valve remains in neutral or park position.
4. Shift impact is large, frustration is obvious
This failure may be due to the transmission oil is too dirty, resulting in the valve body stagnation and caused. The oil inlet filter is clogged; the main oil circuit is seriously leaking; the oil pump is damaged.

5. Strange noise
1. Bearing rattles, with the close relationship between speed, the higher the speed the more screaming.
2. Differential or main drive gear rattling, this rattling generally occurs at speeds of 50-70 kilometers is more obvious, because the gear mesh surface is different, generally in the refueling time rattling obvious, open the throttle rattling obviously weakened.
3. oil pump and other hydraulic system rattles, this rattling with the speed of the close relationship with the speed of the car has no relationship with the speed of the high speed because the oil pump oil suction is blocked, thus causing the screaming. It should be noted that the transmission system with the engine, chassis and other parts of the work together, a lot of sound mixed together, identification is not easy.
6. High oil temperature and odor
Transmission body is relying on hydraulic oil to work, when the oil temperature is too high, will produce some combustion, odor, indicating that the transmission body of some of the executive components are not working properly, need to test.
7. Jumping gears or not upshifting
General automatic transmission has a specific shift speed and speed, if you find that the shift time is suddenly too long or too short, it means that the transmission ratio is disproportionate, at the same time will feel that the engine speed is too high, the situation is even worse is that the transmission does not shift, which need to check the transmission.

8. Transmission slipping, engine idling, no speed up
Including smooth driving has been revving high, speeding up the process of revving high two cases -
1, smooth process of high speed, relatively easy to test, compared to an engine displacement of 2.0 vehicles usually in 2600 rpm can speed to 100 kilometers, if a period of time often need to 3000 rpm or more to reach 100 kilometers, generally due to the transmission of high-speed gear failure or knob within the locking clutch failure caused by the need to immediately overhaul the gearbox.
2, speed up the process of high speed, this fault test is a little complicated, because in the speed up process, the engine speed rise with the accelerator pedal has a close correlation, let's say a normal Passat in the case of small throttle engine speed to 2500 rpm can be accelerated up to the vehicle, but in the full-throttle engine will be raised to 5500-6000 rpm, such a huge contrast is due to the transmission failure or the internal locking clutch failure. Such a huge contrast is due to the fuzzy logic of the electronic control system of the transmission to control
9. Transmission slipping, engine idling
There are also two cases of engine idling--
1. The transmission suddenly drops from a high gear to a low gear in a short period of time, causing the vehicle to suddenly idle, the problem may be in the control system or cooling system, the transmission itself is not a problem.
2. In the process of accelerating or shifting gears in a short period of slippage idling, the problem is mostly in the gearbox clutch and other related links, to the gearbox to carry out a thorough dismantling overhaul.