Common symptoms of automatic transmission shifting faults
* Slipping or delay when shifting gears: Gears do not shift smoothly or are delayed.
* Noise or vibration when shifting gears: Unusual sounds or vibrations when shifting gears.
* Failure to Shift to a Specific Gear: The transmission will not shift to a specific gear, such as reverse or upshift.
*Transmission Fluid Leaks: Visible transmission fluid leaks under the vehicle.
*Check Engine: The check engine light comes on, indicating problems with the transmission.
Causes of automatic transmission gear shift malfunction
*Low Transmission Fluid: Insufficient transmission fluid can cause pressure and shifting problems.
* Contaminated Transmission Fluid: Dirty or old transmission fluid can cause solenoids to stick or shift paths to become blocked.
* Malfunctioning Solenoids: Shift solenoids electromagnetically control the flow of transmission fluid, and failure of them can cause shifting problems.
* Faulty input or output shaft speed sensors: These sensors provide the transmission ECU with shaft speed data, which is used to determine when to shift gears.
*Automatic transmission ECU malfunction: The automatic transmission control unit is responsible for controlling gear shifting, and its malfunction may result in faulty gear shifting.
* Worn or damaged friction discs: Friction discs transfer power from one gear to the next, and wear or damage can lead to slipping and shifting problems.
* Valve body blockage: The valve body directs transmission fluid to various automatic transmission components, and a blockage can cause pressure and shifting problems.
Solving problems with automatic transmission shifting faults
* Check the level and condition of the transmission fluid.
* Scan the automatic transmission ECU for fault codes.
* Check shift solenoids and shaft speed sensors.
* Remove and disassemble the automatic transmission to inspect and repair internal components such as friction discs and valve body.