HI there
This code is usually the result of a faulty pressure solenoid or a problem with the wiring harness. It's basically stating it's taking to long to shift.
P1811 BUICK - Maximum Adaptive & Long Term Shift Read more: https://www.autocodes.com/p1811_buick.html
33.7k questions
32.5k answers
1.3k comments
23.0k users