What is the Downshift Solenoid?
In modern automatic transmission, pressurized hydraulic fluid is used to change gears. Whenever a gear is changed, a transmission solenoid transfer transmission fluid to the valve body so that the correct gear will be engaged. The downshift solenoid monitors the transition from a higher gear to a lower gear. It is an electronically-controlled mechanical parts that allows fluid movement to engage the correct lower gear. If the downshift solenoid is not functioning, you can notice erratic shifts or a lack of transmission downshifting altogether.
Bear in mind:
- Downshift solenoid change is not part of your routine maintenance.
- The failure of the downshift solenoid may lead to serious transmission problems.
How it is done:
- The car front wheels are turned straight and the car is lifted and supported on jack stands
- The defective downshift solenoid is taken out
- The new downshift solenoid is installed
- The car is removed from jack stands
- The car is road tested and checked for downshift solenoid operation
There is no set interval for change of a shift solenoid, though the transmission fluid should be changed per your manufacturer’s recommended interval. Because of the complexity involved in diagnosing a shifting issues, have an expert mechanic diagnose it.
What common signs indicate you may need to change the Downshift Solenoid?
- Erratic shifting – your vehicle skips gears, shifts back and forth between gears, or simply doesn’t shift at all
- Vehicle won’t downshift
- The transmission gets stuck in neutral
- You notice delayed shifting
How vital is this service?
Erratic shifting can be hard to anticipate and control when you are driving, and can put you in a potentially difficult driving situation. It should be repaired immediately.
SEE ALSO:HOW TO KNOW A FAILED VVT SOLENOID