Possible reasons for high speed when switching automatic transmission:
1. Problems with solenoids:
* Worn or faulty solenoids can restrict fluid flow to the transmission, resulting in delayed shifting and increased RPM.
2. Malfunction of the throttle position sensor:
* A faulty sensor may not accurately read throttle position, resulting in poor shifting and over-revving.
3. Contaminated or low transmission fluid level:
* Contaminated or insufficient transmission fluid can result in insufficient lubrication and cooling, which can cause delayed shifting and over-revving.
4. Problems with the transmission control unit (TCU):
* A faulty TCU may not control the transmission properly, resulting in rough shifting and over-revving.
5. Mechanical transmission problems:
*Worn or damaged mechanical components such as gears can cause delayed shifting and over-revving.
How to fix the problem:
1. Diagnostics:
*Consult a mechanic to diagnose and determine the exact cause of the problem.
2. Repair:
*Depending on the identified cause, the solenoids, throttle position sensor, transmission, or control unit may need to be replaced or repaired.
3. Maintenance:
* Check and change the transmission fluid and filter regularly. Also clean the throttle body.
4. Troubleshooting:
*If the problem occurred after recent transmission service, check the transmission fluid level and condition.
* Make sure all electrical connections are secure.
Important: Do not ignore the problem of over-revving when shifting the automatic transmission. If not corrected, it can cause further damage to the transmission and costly repairs.