# Error 51 after controller rebuild
**URL:** https://community.electricforum.com/t/error-51-after-controller-rebuild/20183
**Category:** GEM Forum
**Created:** [November 2, 2020, 2:11pm UTC](https://community.electricforum.com/t/error-51-after-controller-rebuild/20183 "2020-11-02T14:11:45Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@chris1](https://community.electricforum.com/u/chris1)
#### Post date: [November 2, 2020, 2:11pm UTC](https://community.electricforum.com/t/error-51-after-controller-rebuild/20183/1 "2020-11-02T14:11:45Z")
What up guys? We are running 2014 E4 with a 96v Bolt battery. Smoked the controller which was rebuilt (code 41) and now we are getting code 51 for
Low voltage. Battery is at 94v so we aren’t low, any thoughts? Main contactor possibly?
Thanks!
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### Author:  [@Inwo](https://community.electricforum.com/u/Inwo)
#### Post date: [November 2, 2020, 3:50pm UTC](https://community.electricforum.com/t/error-51-after-controller-rebuild/20183/2 "2020-11-02T15:50:07Z")
Check voltage at p1 after spoof.
Possibly p17.
What were the symptoms of bad controller?
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### Author:  [@chris1](https://community.electricforum.com/u/chris1)
#### Post date: [November 2, 2020, 5:32pm UTC](https://community.electricforum.com/t/error-51-after-controller-rebuild/20183/3 "2020-11-02T17:32:27Z")
Stone dead, no power to the car what so ever. I will check the pins for you tonight. Thanks Dave.
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### Author:  [@chris1](https://community.electricforum.com/u/chris1)
#### Post date: [November 4, 2020, 1:56am UTC](https://community.electricforum.com/t/error-51-after-controller-rebuild/20183/4 "2020-11-04T01:56:37Z")
@Inwo after the spoof 83.3v, pin 17 93.3v.
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### Author:  [@Inwo](https://community.electricforum.com/u/Inwo)
#### Post date: [November 4, 2020, 2:49am UTC](https://community.electricforum.com/t/error-51-after-controller-rebuild/20183/5 "2020-11-04T02:49:48Z")
Got me. That should work.