The main reasons why an automatic transmission stops shifting:
1. Lack of transmission fluid:
* Fluid leak
* Insufficient fluid level
*Old or contaminated fluid
2. Problems with solenoids:
* Solenoids control gear shifting
* Stuck or damaged solenoids can cause shifting problems
3. Sensor malfunction:
* Sensors provide information about engine and transmission performance to the Transmission Control Module (TCM)
* Faulty sensors may result in incorrect shifting
4. Problems with TCM:
* TCM controls gear shifting
*TCM malfunction may result in inability to shift gears
5. Mechanical problems:
*Worn or damaged internal transmission components
*Clutch or band brakes may fail, causing slipping or jamming of gears
6. Electrical wiring or connectors:
*Shorts, breaks, or faulty connectors can disrupt communication between transmission components
7. Transmission fluid pressure:
*Low or high fluid pressure can cause shifting problems
8. Software glitches:
* Faulty TCM software may cause shifting problems
9. Overheating:
*Extreme temperatures can damage transmission components, leading to shifting problems
10. Towing heavy loads:
*Excessive towing can overload the transmission and cause shifting problems