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You can get a pressure sensor from Ebay (but do check it is the correct one for your vehicle...). It's not a big job to change one.: buick transmission pressure sensor
However, check the condition of your transmission fluid first. If it smells burnt or is blackish - change it.
Bad Transmission Lockup TCS Solenoid On Buick: http://youtu.be/YDcqVB1VJAs
this is not for your car but it should head you in the direction you can always go to the parts store and theycan pull a picture up for you where its located
It is located in front of the center console...I found a video on utube.. Place your question as you have here.Video is pretty informative.. Good Luck..And GOD BLESS!
let transmission shop do pressure test and diagnostic check.many things will cause transmission not to shift right.could have faulty over drive solenoid.faulty VSS sensor it controls shifts. could have faulty TPS sensor or TCM.the first and second shift valves or solenoids bad your transmission is electronically control many things will cause problems the transmission shop use scanner to check out all shift solenoids.the older transmissions use modulator valve and governor valve control transmission shifts but the newer transmissions shifts control by TCM and ECM.
There is a solenoid (I don't recall exactly what it is called but it will be something like "rear differential actuator solenoid") in the rear differential that is prone to failure. I wouldn't hesitate to start by replacing it. It is spendy!
There could be alot of problems if the AWD lights comes it could either transmission oil is old or the oil filter is dirty ,these interact with onboard computer and produces false signal which causes the car to be AWD mode or this could be the problem with selector switch ,first try to replace the oil and check if its AWD light goes......
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