Possible reasons why the automatic transmission stopped speeding:
1. Low transmission fluid level:
* Check the fluid level using the dipstick.
*Low levels may result in slipping or lack of gear engagement.
2. Transmission fluid burnt:
* Blackened or burnt-smelling fluid indicates overheating or wear.
* Replace fluid and filter.
3. Malfunction of solenoids:
* Solenoids control gear shifting.
* Their malfunction may lead to problems with gear shifting.
4. Damaged or dirty valve body:
* The valve body is responsible for regulating fluid pressure.
* Contamination or damage may prevent gears from operating properly.
5. Malfunction of the electronic control unit (ECU):
* The ECU controls the automatic transmission.
* ECU failure may cause gear shifting problems.
6. Torque converter slippage:
* The torque converter transfers power from the engine to the transmission.
*Slippage may result in a lack of gear engagement.
7. Wear of mechanical components:
* Gears, clutches and other mechanical components can wear out over time.
* Wear may result in slippage or lack of gear engagement.
8. Sensor malfunction:
* Speed sensors, crankshaft and camshaft position sensors can affect the operation of the automatic transmission.
* Faulty sensors can cause shifting problems.
What to do:
* Check the transmission fluid level and condition.
*Connect a scanner for fault codes.
*Consult a qualified mechanic for diagnosis and repair.