What to know about the Downshift Solenoid:
In modern automatic transmission, pressurized hydraulic fluid is used to change gears. Each time a gear is changed, a transmission solenoid directs transmission fluid to the valve body so that the correct gear will be engaged. The downshift solenoid controls the transition from a higher gear to a lower gear. It is an electronically-controlled mechanical device that permits fluid movement to engage the correct lower gear. If the downshift solenoid is not working, you can experience inconsistent shifts or a lack of transmission downshifting altogether.
SEE ALSO:HOW TO REPLACE A DOWNSHIFT SOLENOID
Facts to Note:
Downshift solenoid replacement is not part of your routine upkeep.
The failure of the downshift solenoid may result in serious transmission problems.
How to Fix:
The vehicle front wheels are turned straight and the vehicle is lifted and supported on jack stands
The faulty downshift solenoid is detached
The new downshift solenoid is installed
The vehicle is removed from jack stands
The vehicle is road tested and checked for downshift solenoid operation
There is no set interval for replacement 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 problem, have one of your expert mechanics diagnose it.
Common symptoms indicating you may need to change the Downshift Solenoid:
Intermittent shifting – your car skips gears, shifts back and forth between gears, or simply doesn’t shift at all
Vehicle won’t downshift
The transmission is stuck in neutral
You experience delayed shifting
Importanceof this service:
Inconsistent shifting can be difficult to anticipate and control when you are driving, and can put you in a potentially difficult driving situation. It should be diagnosed straightaway.