General symptoms of Land Rover Discovery automatic transmission malfunction:
* Gear slippage
*Hard shifts
* Switching delays
* Jerks or jolts when switching
* No gear shift
* Transmission fluid leaks
Possible reasons:
Mechanical:
* Worn clutch friction discs
* Broken or worn gears
* Faulty bearings
*Hydraulic pump problems
* Transmission fluid leaks
Electrical:
* Faulty shift solenoids
* Problems with the automatic transmission control unit
* Faulty speed sensors
Hydraulic:
* Contaminated or low transmission fluid level
* Malfunctions in the valve body
* Clogged automatic transmission filter
Other:
* Worn flywheel
* Malfunctions in the transfer case
General solutions:
* Replacement of transmission fluid and filter
* Repair or replacement of clutch friction discs
* Replacement of worn gears or bearings
* Replacement of faulty solenoids or automatic transmission control unit
* Solving problems with transmission fluid leaks
* Repair or replacement of hydraulic pump
* Cleaning the valve body and replacing speed sensors
Note: the exact solution to an automatic transmission malfunction depends on the specific symptoms and diagnostic results. Automatic transmission malfunctions require professional diagnosis and repair.