Causes of poor gear shifts in an automatic transmission:
Mechanical problems:
* Wear of clutch friction linings
* Clogged or dirty transmission fluid filter
* Faulty shift solenoid
* Faulty Transmission Control Unit (TCU)
* Problems with the oil pump
*Transmission fluid leak
Electrical problems:
* Faulty speed sensors
* Faulty wires or connections
* TCU malfunction
Transmission fluid problems:
*Low fluid level
* Contaminated or old fluid
* Wrong fluid type
Other possible reasons:
* Worn spark plugs or wires
* Dirty throttle position sensor
* Problems with the exhaust system
Signs of bad gear shifts:
* Delay when shifting gears
* Gear slippage
* Jerks or jerks when shifting gears
* Extraneous noise coming from the transmission
Diagnostics:
* Computer diagnostics to search for fault codes
* Checking the level and condition of the transmission fluid
* Test drive to evaluate gear shifts
*Visual inspection of transmission and related components
Repair options:
* Replacement of damaged components
* Replacement of transmission fluid and filter
* TCU repair or replacement
* Leak repair
* Replacement of spark plugs or wires
* Cleaning the throttle position sensor
Maintenance recommendations:
*Change the transmission fluid and filter regularly according to the manufacturer’s recommendations.
* Check transmission fluid level and condition every 30,000-60,000 km.
* Do not overload the vehicle.
* Avoid sudden acceleration and braking.
*If you notice any signs of poor shifting, take it to a professional mechanic for diagnosis and repair.