Symptoms of a faulty automatic transmission pump:
1. Gear slippage
* The transmission slips or slips when changing gears.
* There is a loss of power and the vehicle is unable to gain speed.
* Engine speed increases, but speed does not increase.
2. Gear shift delay
* The transmission changes gears slowly or does not shift at all.
* Noticeable lag when shifting gears.
* The car may get stuck in one gear.
3. Noise and vibration
*A hum or noise is heard while the vehicle is moving.
* Vibration is felt in the steering wheel, floor or body.
* The noise increases when accelerating or changing gears.
4. Low automatic transmission oil pressure
* The low automatic transmission oil pressure indicator lights up on the dashboard.
* The transmission may go into limp mode or not work at all.
* Smell of burnt automatic transmission oil.
5. Transmission overheating
* The transmission overheat indicator lights up on the instrument panel.
* Transmission fluid temperature rises above normal.
* The vehicle may go into limp mode or not move at all.
6. Transmission fluid leak
*Visible transmission fluid leaks under the vehicle.
*Low transmission fluid level.
*Transmission fluid may be dark or burnt in color.
Other signs:
* Difficulty starting the engine.
* Loss of power and poor handling.
* Strange smell in the car interior.
* Failure or malfunction of the transmission control system.
Causes of automatic transmission pump failure:
* Wear of pump blades or housing
* Damage to pump splines
* Clogged oil receiver
*Bearing failure
* Pump housing defect