2005 Buick LaSabre Custom 3.8L v6 won't shift out of 3rd gear into 4th. There are no codes when scanned with OBD2 for anything power train related. But all symptoms suggest either faulty transmission control module, or pressure control solenoid. However, was told by another LaSabre owner that changing the transmission filter and doing a fluid change fixes the issue. Again, no codes are showing. Does anyone know if just a filter and fluid change will actually work or am I in bigger trouble with this? Mechanical skills are slim and $ is less than my skill set. Any skilled help is appreciated !
What is the mileage? If your vehicle is slipping, then your transmission is on its way out. Have a transmission pro look at it and see what they say.
What is the mileage?
128,255 - I honestly hear what you're saying, and would jump at the opportunity to allow someone with experience and expertise to take over. Unfortunately, I'm hoping to get lucky with this one, I live in a remote area, on disability, and the car was given to me. ....I'm just praying at this point.
2005 Buick LaSabre Custom 3.8L v6 won't shift out of 3rd gear into 4th.
I lacked to further explain that i can force the vehicle into 4th gear with first shifting into the 3 gear on the column shifter. i can drive up to 45ish mph but must maintain RPM of 4000 for a small length of time and the car will then (not forcefully, or hard, or jerky) shift into the 4th gear that it does not shift into while the column shifter is in the D position at start. However, as soon as the shift occurs I manually move my column gear selector into the D position and continue driving like nothing was ever wrong, until the dreaded slow downs that cause the vehicle to downshift once again. At which time the manual shifting must commence once again.
this is what lead me to think it could possibly be the pressure control selenoid, but like previously stated, there are absolutely no powertrain codes firing off in the obd2 at this time.