2006 Chevrolet Impala

Electrical problem
2006 Chevy Impala 6 cyl Front Wheel Drive Automatic 95,000 miles

Cruise control cuts in and out. After non-diagnosis by local shop, I checked the fuses and relays in fuse box under hood. I found several were not seated all the way. I pushed all down to seat properly and cruise worked fine for months. Now have problem again, and I re-seated relays and fuses. But problem resumes.

Unfortunately, Chevy fuse box and owners manual DOES not identify cruise fuse or relay. Help!
John Ho10
October 11, 2010.

Use an electronics cleaner and dielectric grease on fuses, this should solve problem.

Oct 13, 2010.
In addition to the above symptoms, the RPM's would increase 200-300 without a corresponding increase in speed. This condition occured in or out of "cruise" mode and frequently when car was cold. Cold weather seemed to make it worse. However, at times, after a warm up the cruise worked fine.
Frustrated, I took car to my shop. They discovered that the wire harness connected to the trans speed control sensor had corroded. They replaced wire harness and speed sensor. Works fine now.

Hope this helps those who were looking to replace the brake light switch. Perform electrical diagnostics on the trans speed sensor connector first.

John Ho10
Feb 9, 2011.