Reasons for spontaneous automatic transmission shifting:
1. Mechanical problems:
* Worn or damaged gears, shafts, bearings
*Pump, transmission fluid or filter problems
* Malfunctions in the transmission control module (TCM) or powertrain control module (PCM)
2. Problems with the electrical system:
* Faulty solenoids responsible for shifting gears
* Damaged or malfunctioning speed sensors
* Problems with wiring or connectors
3. Fluid leaks:
*Low transmission fluid level due to seals, gaskets or hoses leaking
* Insufficient hydraulic pressure required for proper gear engagement
4. Software glitches:
* Errors or incorrect data in TCM or PCM software
* Malfunctions in sensors or input signals that are used to control gear shifting
Symptoms of spontaneous automatic transmission shifting:
* The transmission spontaneously switches to other gears without driver intervention
*Hard or slipping gear shifts
* Noises or vibrations during gear changes
*Loss of power or difficulty accelerating
* Transmission overheating
*Transmission fault indicator lights up
Diagnosis of spontaneous automatic transmission shifting:
* Diagnose faults using OBD-II scanner
* Checking the level and condition of the transmission fluid
* Check the mechanical part of the gearbox for leaks or damage
* Inspect the electrical system for faulty solenoids, sensors and wiring
* Analysis of data and signals from sensors used to control gear shifting
Repair of spontaneously shifting automatic transmission:
Repair of an automatic transmission with spontaneous gear shifting depends on the main cause of the malfunction. Some common repair options include:
* Replacement of worn or damaged mechanical components
* Repair or replace faulty solenoids, sensors or wiring
* Replace or update TCM or PCM software
*Service or replace transmission fluid and filter