General symptoms
* Gear slipping or non-shifting
* Jerks or bumps when shifting gears
* Delay in gear shifting
* Transmission gets stuck in one gear
* Automatic transmission overheating
* Reduced fuel consumption
* Extraneous noise or vibration
Specific symptoms for different types of valve bodies
Electronically controlled valve body
* Fault codes on the dashboard
* Unexpected transmission behavior such as shifting to neutral while driving
* Failure to transmit switching commands from the engine control unit
*No oil pressure
Mechanical valve body
* Incorrect operation of solenoids that control fluid flow
* Clogged or damaged valves
* Faulty switching servos
* Fluid leaks from the valve body
Valve block shaft
* Shaft wear or damage
* Spline failures on the shaft
* Play or sticking of the shift rod
* Improper engagement with drums and pistons
Solenoid block
* Burnt out or jammed solenoids
* Open or shorted electrical connections
* Fluid leaks through solenoids
Other possible faults
* Faulty speed or position sensors
* Malfunction of the transmission control unit
*Low or contaminated transmission fluid
* Mechanical damage to other gearbox components