Accu Malfunctions: Signs and Causes

Causes of automatic transmission failure

It is impossible to consider absolutely all causes of automatic transmission failure, but the main ones are the following:


The use in the repair of the automatic transmission of low-quality analogues of spare parts, which eventually fail and affect the work of the entire automatic transmission system;

Wear and tear of the elements of the unit;

Improper operation of the car;

Lack of oil, which provokes overheating of the automatic transmission and further malfunction;

Malfunction in the control unit;

Defects in the work of the hydraulic unit.

It is worth understanding that in the normal state, the automatic transmission works smoothly and gently. The need to make an effort to shift speeds indicates only future possible malfunctions of the automatic transmission.


Signs of automatic transmission malfunction



Knowing the signs that "tell" about problems with the automatic transmission can help avoid costly repairs. Timely response to the presence of a problem will significantly reduce costs.


The following can be attributed to the main signs of gearbox malfunction:


The vehicle does not move in any gear;

There is no sound/click, indicating that the gear shifts;

A knocking of the automatic transmission is heard. The main cause is damage of friction clutch discs;

Slipping/jerking of the car in motion. The cause is breakage of overrunning clutch;

Absence of a back speed. The main reasons: problems with the clutch piston collar, clutch oil seals or wear and tear of one clutch disc;

The car can move only on the third speed. Replacing the forward clutch, clutch piston collar, or checking the hydrogroup valve will help solve the problem;

Vibration in motion and other uncharacteristic sounds notify about wear of one of the bearings;

Vibration in motion and other abnormal sounds notify that one of the bearings is worn;; When the vehicle is lifted, speed is reduced to a slower speed. It is necessary to check the oil level in the automatic transmission, look at the condition of the oil pump and flex-block, as well as check the condition of the brake belt and clutch;

Pressing the pedal to the floor, automatic transmission does not shift to a lower speed and revolutions are not gained. The problem is in the engine;

Pieces of aluminum on the sump notify the sliding bearing is worn and needs to be replaced;

The engine stalls when shifting gears. The cause: a problem with the hydroblock or the wheels of the car;

Slow acceleration of the car sometimes warns of problems with the turbine wheel of the hydroblock.

Very often the inscription "AT" on the dashboard of the car can notify about the presence of a problem with the automatic transmission. Sometimes sellers successfully muffle this error before selling a car, so it is desirable to visit a service station before buying a used car, where a master can quickly find all the faults of automatic transmission and not only


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