My wife and I were on the way into our holidays. Of course we took our Roadmaster for the roadtrip. Suddenly the "Service Engine Soon" lamp came on while driving on the highway.
We stopped on the next rest area, but I could not find anything wrong with the car. So we continued our journey and stopped at the next specialized dealer to have the error code read out. Code "P1886" showed up - which is transmission related. The 2-3 upshift solenoid seemed to be defective. So we decided not to drive any farther, as it turned out that the car only ran on second and third gear. Finally the car was delivered to the next national automobile club service station of the "ÖAMTC" to be towed to the dealer I bought the car from. I still have 6 months guarantee left, so he has to repair the transmission at his costs. Worst thing was that we just could not continue to enjoy our trip with the Roadmaster and had to borrow a Suzuki Jeep from my wifes mom instead...

UPDATE: In the meantime a transmission specialist took over my car and is completely rebuilding the transmission now... At least I´ll have a like new transmission now!

suddenly this lamp showed up...

delivering the car at the national automobile club "ÖAMTC"

checking the Buick´s digital shop manual we had with us...