2003 CTS black on 20" Falken aviators, 1986 Monte Carlo.
I have a 2003 CTS 3.2L with 134k. I went to the store today, didnt notice it untill the way home, but the speedo was not working. stuck at zero. So i went home shut the car off for about 3 minutes. drove down the street still did not work. i turned around headed back home and it started working again but it didnt seem that it was accurate. i was doing about 25 30 mph and it said i was doing 15 to 20 mph. It has stock wheels so it couldnt be off do to over sized wheels. im going to take it out again tonight and see if it works.