Signs of a faulty automatic transmission donut:
1. Slip:
* The vehicle accelerates slowly even when you press the gas pedal.
* Engine speed increases, but vehicle speed does not increase.
2. Vibration or shaking:
* Vibration or shaking when shifting gears or accelerating.
*May be felt on the steering wheel, floor or pedals.
3. Overheating:
* Overheating of the automatic transmission, which can be caused by slippage or a faulty donut pump.
4. Hum or howl:
* Constant or intermittent hum or howl while driving.
*May get worse when accelerating or at certain speeds.
5. Difficulty starting the engine:
* The engine may have difficulty starting or may not start at all.
* May be caused by a jammed donut or a faulty lockup clutch.
6. Gear shift delay:
* Gear shifts are delayed or jerky.
*Can be caused by a slipping or faulty donut lock control valve.
7. Transmission fluid leak:
*Leaking transmission fluid may be a sign that the donut is leaking.
* Fluid may leak from the front donut seal or other seals.
8. Increased fuel consumption:
* A slipping or faulty donut can result in reduced power transmission efficiency and increased fuel consumption.
9. Reduced performance:
* The vehicle may accelerate more poorly or have less traction.
*Can be caused by the donut slipping or failing to lock.
10. Fault codes:
*Transmission or donut related trouble codes may appear in the vehicle’s diagnostic system.