# Need help with component diagnostics! **URL:** \ **Category:** GEM Forum\ **Created:** [December 16, 2021, 1:11am UTC](https://community.electricforum.com/t/need-help-with-component-diagnostics/23097 "2021-12-16T01:11:49Z")\ **Posts on this page:** 1\ **Showing post:** 20
**Author:** ![AssyRequired](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/assyrequired/32/7621_2.png) [@AssyRequired](https://community.electricforum.com/u/AssyRequired)\ **Post date:** [December 24, 2021, 12:20am UTC](https://community.electricforum.com/t/need-help-with-component-diagnostics/23097/20 "2021-12-24T00:20:33Z")
Here is a thread from some of our legacy members that more/less goes down your path- Some of this is on later controllers, but I think it all applies. > [@66 error code](https://community.electricforum.com/t/66-error-code/6503/): > > I have a 2002 Gem Car that did something very strange today. Started down a decent steep hill today, and it picked up good speed. All the sudden the dash indicator lights started flashing and it just quit. Now it will go into reverse, but every time I switch to forward, it kicks out and a -66 error code pops up. Tried it several times but no luck. Rode home on a flat bed wrecker… Im new to Gem cars, but I feel it had something to do with maybe going down hill too fast. But I may be 100 % wron… * * * > [@T3 controller rebuild help](https://community.electricforum.com/t/t3-controller-rebuild-help/20356): > > Hello everyone I’ve researched as much as I can so far and need some more guidance I bought another project gem that has been sitting for 2.5 years. I know a fair share about them Cleaned it up Installed new batteries Pulled out of the driveway for the maiden voyage and I made it about 3 miles and I got cone 51 51 motor controller voltage low electrical fault check voltage After cycling key a bunch of time I limped it home to charge Figured one of my new batteries was low on voltage Th… * * * --- _[View the full topic](https://community.electricforum.com/t/need-help-with-component-diagnostics/23097)._