I replaced the GEM to coreect the inop 4wd problem. Now I have a speedo that is out of control. When going approx. 9 miles an hour, the speedo, and data on scanner, reads in the hundreds. I was told by dealer that no flashing would be required for gem. Is there some calibration step I'm missing. Thanks for your time.
Friday, November 16th, 2012 AT 3:46 PM