Join Date: Mar 2019
Location: Maple Grove, MN
2010 Traverse downshifts unexpectedly at highway speed
Our 2010 Chevy Traverse will downshift and rev up to about 7000 RPM unexpectedly while driving down the highway. It happens very intermittently but seemed to occur more often at bitter cold temperatures. Weíre talking about 10 to 15 degrees below zero, which is not uncommon here in Minnesota. Also, the Check Engine light does not come on. Pulling over, stopping and shutting the ignition off and back on usually resets it.
Our mechanic replaced the O2 sensor just to try something while he was repairing other issues.
Donít know what we should start replacing, maybe the MAP, speed sensor, or PCM (which would be quite expensive)