Possible reasons for hard gear shifting in an automatic transmission:
Mechanical faults:
* Worn friction discs
* Faulty solenoids
* Damaged torque converter
*Low transmission fluid level
* Contaminated transmission fluid
* Incorrect adjustment of the gear selector cable
Electronic faults:
* Faulty speed sensor
*Faulty throttle position sensor
* Malfunction of the electronic control unit (ECU) of the transmission
Other reasons:
* Dirty or clogged air filter
* Faulty spark plugs or ignition coils
* Problems with the engine cooling system
* Faulty oxygen sensor
What to do:
1. Check the level and condition of the transmission fluid. If necessary, add or replace fluid.
2. Scan the vehicle for fault codes. This can help identify electronic problems.
3. Contact a qualified mechanic. Diagnosing and repairing mechanical problems requires specialized equipment and knowledge.
Important Note: Hard shifting may cause further damage to the transmission. Don’t ignore the problem if it arises.