I took my car to STS Tire & Auto yesterday to get three tires I had mounted because they were open on Sunday. When my car was returned, the “check engine” lite was on. This was not the case when I brought the car in. Something that happened inside the STS shop set off my “check engine” light.

The manager said that the technician documented that the “check engine” light was on when I brought in the car. This was not accurate. Not having any recourse other than to be charged additional diagnostic expenses, I started to leave.

When I entered my car the second time, I noticed that the clock incorrectly read 12:22. Obviously 22 minutes ago, when the car was inside the STS shop, something happened to the car to manipulate the computer “check engine” light and reset the clock to 12:00. When I brought this to the manager’s attention he had no explanation why the clock and computer would have been reset during a routine tire installation. He just stated that it could not have been something the technician did.

I think I was getting scammed to get them to do a diagnostic and repair that wasn’t needed.

How can you trick the JK check engine light into coming on? I think the code is for low voltage.

 

Check that your battery connections are tight and that you can't twist them with your hand. Maybe it's just coincidental.

 

I'm kinda with 14Sport...it sounds coincidental, and I too would suspect a loose connection with the battery, or a corroded cable that's giving up.

Do you know any more about the code? Have you looked it up to see what it describes?