Possible causes of shifting when shifting gears on an automatic transmission:
1. Low transmission fluid level:
* Insufficient fluid levels cause insufficient lubrication and cooling of the transmission, resulting in overheating and high-speed shifting.
2. Contaminated or old transmission fluid:
* Contaminated or old fluid loses its viscous properties, which makes it difficult to shift gears smoothly and can cause over-gassing.
3. Worn or damaged transmission components:
* Worn clutches, clutches or solenoids may shift gears incorrectly, resulting in over-gearing.
4. Problems with the electronic control unit (ECU):
* A faulty ECU may send incorrect signals to the transmission, resulting in shifting problems.
5. Problems with sensors:
* Faulty sensors such as the speed sensor or throttle position sensor can provide incorrect information to the ECU, causing inappropriate gear shifting.
6. Incorrect transmission fluid pressure:
* Fluid pressure that is too high or too low can interfere with the normal operation of the transmission and lead to over-gassing.
7. Incorrect connection of vacuum hoses:
* If the vacuum hoses connected to the transmission are damaged or improperly connected, this may cause the vacuum modulator to not function properly, which may cause over-gassing.
8. Torque converter malfunction:
* A faulty torque converter can create excessive slip, which leads to overheating and over-gassing.
9. Transmission software problems:
*In some cases, updating the transmission software may resolve shifting issues that cause hesitation.