# 66 error code
**URL:** https://community.electricforum.com/t/66-error-code/6503
**Category:** GEM Forum
**Created:** [November 24, 2016, 3:45pm UTC](https://community.electricforum.com/t/66-error-code/6503 "2016-11-24T15:45:41Z")
**Posts on this page:** 20
**Page:** 4
### Author:  [@DelThink](https://community.electricforum.com/u/DelThink)
#### Post date: [December 9, 2021, 2:41am UTC](https://community.electricforum.com/t/66-error-code/6503/62 "2021-12-09T02:41:50Z")
Okay, thanks.
I will call them tomorrow.
A lot of work to pull and replace this controller after mailing it out for three weeks!
Fingers crossed.
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### Author:  [@JarJarJava](https://community.electricforum.com/u/JarJarJava)
#### Post date: [December 9, 2021, 3:40am UTC](https://community.electricforum.com/t/66-error-code/6503/63 "2021-12-09T03:40:58Z")
I’m just saying to see what they say, maybe it is, maybe it isn’t but when they say they rebuilt it, yet it still errors the same, one has to wonder. Did they rebuild it blindly or test the fets before replacing? If they tested the controller prior and diagnosed it, they should be able to tell you what they replaced. Maybe they missed something, Otherwise, I’ve never dealt with an order 66 error so I’m not sure what else to recommend you check,
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### Author:  [@Inwo](https://community.electricforum.com/u/Inwo)
#### Post date: [December 9, 2021, 4:23am UTC](https://community.electricforum.com/t/66-error-code/6503/64 "2021-12-09T04:23:17Z")
Although 66 is almost always the field transistors shorted, it needs to be verified. No sense changing them they are ok.
One way to verify, unplug the motor field wires to see if it clears the code. If it does then it’s a motor issue.
The field might be shorted.
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### Author:  [@DelThink](https://community.electricforum.com/u/DelThink)
#### Post date: [December 10, 2021, 9:18pm UTC](https://community.electricforum.com/t/66-error-code/6503/65 "2021-12-10T21:18:24Z")
Hello, I just removed, cleaned, and replaced the motor wires, I am still getting a code 66.
I have had this thing for a month and cannot figure out how to get it going, I have a call in with FSIP regarding the rebuilt T2 controller, hoping they get back to me before the weekend.
This is a simple system, what am I missing?
The fuses look good, I have read another owner rebuilt his T2 controller AND replaced the engine, he is STILL getting an error code 66.
Help please……
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### Author:  [@DelThink](https://community.electricforum.com/u/DelThink)
#### Post date: [December 10, 2021, 9:19pm UTC](https://community.electricforum.com/t/66-error-code/6503/66 "2021-12-10T21:19:59Z")
When the motor wires were all disconnected I received error code “000”, once they were replaced it immediately read -66
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### Author:  [@Derrick](https://community.electricforum.com/u/Derrick)
#### Post date: [December 10, 2021, 9:48pm UTC](https://community.electricforum.com/t/66-error-code/6503/67 "2021-12-10T21:48:26Z")
I believe what he was saying was to disconnect the 2 field wires (the skinny ones) only from the motor and then see what happens. Make sure they are out of the way and won’t short on anything.
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### Author:  [@DelThink](https://community.electricforum.com/u/DelThink)
#### Post date: [December 10, 2021, 10:13pm UTC](https://community.electricforum.com/t/66-error-code/6503/68 "2021-12-10T22:13:18Z")
OK, I just disconnected the two field wires and I get a "000"on my display.
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### Author:  [@Inwo](https://community.electricforum.com/u/Inwo)
#### Post date: [December 10, 2021, 10:55pm UTC](https://community.electricforum.com/t/66-error-code/6503/69 "2021-12-10T22:55:20Z")
IMO, that may be a motor issue. But don’t know what 000 means.
Ohm out the motor and hope something obvious shows up.
It would help if we could trust FSIP to only repair controller if it’s bad.
Low ohms A to A
Low ohms F to F
Inf ohms A to F
Inf ohms housing to A and housing to F
Might they reset odometer to 0?
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### Author:  [@JarJarJava](https://community.electricforum.com/u/JarJarJava)
#### Post date: [December 11, 2021, 12:08am UTC](https://community.electricforum.com/t/66-error-code/6503/70 "2021-12-11T00:08:09Z")
They probably did, but Odometer typically displays at power off on T2. Two consecutive screens with quick blink in-between. Four digits per screen.
First screen is thousands, next screen is millions.
Ie: 0318 followed by 0000 = 318 miles
0318 followed by 0001 = 10318 miles
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### Author:  [@Kevin](https://community.electricforum.com/u/Kevin)
#### Post date: [June 5, 2022, 2:13pm UTC](https://community.electricforum.com/t/66-error-code/6503/71 "2022-06-05T14:13:13Z")
Hey Folks!
I had error code 66 appear on my 05 e4 yesterday after climbing a somewhat steep hill. Turning off the engine and back on (not a master reset) removed the code and got me running again but there was definitely a burnt smell.
It seems like for most folks the 66 was permanent? Is my issue different?
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### Author:  [@AssyRequired](https://community.electricforum.com/u/AssyRequired)
#### Post date: [June 5, 2022, 4:40pm UTC](https://community.electricforum.com/t/66-error-code/6503/72 "2022-06-05T16:40:19Z")
It’s tough to say. High field current is not something that usually pops up as an issue pointing to the motor. Being an 05 means you have a T3 controller. As you probably know they were only used one year. You might want to be thinking about shopping around/upgrading to a T4.
Run it around a bit and don’t go too far. If it does finally go dead on you, try Reverse to see if that works. Rather than backing up the whole way home, reverse the field wires on the top of the controller (just .250 tabs = No tools) and it’ll go forwards but at a reduced rate (reverse programming is usually slower). You’ll also be beeping the whole way home.
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### Author:  [@dougl](https://community.electricforum.com/u/dougl)
#### Post date: [June 5, 2022, 6:09pm UTC](https://community.electricforum.com/t/66-error-code/6503/73 "2022-06-05T18:09:28Z")
you might consider reading of my experience with a 66 error code:
> [@Is the consensus that one -66 is the beginning of the end](https://community.electricforum.com/t/is-the-consensus-that-one-66-is-the-beginning-of-the-end/24289):
>
> I was traveling down a very slight decline and IIRC had just backed off on the throttle and got a -66 on my 2002 e4 with a T2 controller. I immediately moved to the side of the road then cycled power(key ON/OFF) and cleared the -66. I then continued to drive another 8 blocks or so back home without any issues. Could this be a fluke or a sign to bring a tow strap with me at all times?
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### Author:  [@Kevin](https://community.electricforum.com/u/Kevin)
#### Post date: [June 5, 2022, 6:37pm UTC](https://community.electricforum.com/t/66-error-code/6503/74 "2022-06-05T18:37:43Z")
Thank you, both!
I’m still a newbie and a lot of the info in doug’s thread went over my head, but it seems like the controller definitely needs to be serviced/replaced and there is even a possibility of a motor problem?
I don’t drive more than 0.75 - 1.5 miles between charges. Should I go on a longer run just to test (obviously with the risk of the gem completely shutting down) or are there tests I could run at home?
I do have a voltmeter and know how to get readings. (Probably about the max I could do)
If I do need to replace the controller, is anyone selling one or know where I can buy one?
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### Author:  [@JarJarJava](https://community.electricforum.com/u/JarJarJava)
#### Post date: [June 5, 2022, 9:47pm UTC](https://community.electricforum.com/t/66-error-code/6503/75 "2022-06-05T21:47:10Z")
> [@Kevin](#):
>
> I had error code 66 appear on my 05 e4 yesterday
Two order 66’s in a week.
I have a bad feeling about this…
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### Author:  [@AssyRequired](https://community.electricforum.com/u/AssyRequired)
#### Post date: [June 5, 2022, 10:03pm UTC](https://community.electricforum.com/t/66-error-code/6503/76 "2022-06-05T22:03:18Z")
Now you are quoting Han Solo?
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### Author:  [@JarJarJava](https://community.electricforum.com/u/JarJarJava)
#### Post date: [June 5, 2022, 10:35pm UTC](https://community.electricforum.com/t/66-error-code/6503/77 "2022-06-05T22:35:28Z")
> [@AssyRequired](#):
>
> Now you are quoting Han Solo?
.
Yes.
You have not experienced Star Wars until you have read the scripts in their original Klingon.
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### Author:  [@dougl](https://community.electricforum.com/u/dougl)
#### Post date: [June 6, 2022, 2:08am UTC](https://community.electricforum.com/t/66-error-code/6503/78 "2022-06-06T02:08:11Z")
Was there a solar flare I missed? And BTW, I have not even touched Kevin’s GEM so it wasn’t me.
Controllers just seem to commit hari kari when near me these days. Yesterday, I swapped out a T2 for a new one and after connecting it all up the new controller turned into a 24V controller! I had to do the unswap and luckily the original has not blown itself up to spite me.
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### Author:  [@AssyRequired](https://community.electricforum.com/u/AssyRequired)
#### Post date: [June 6, 2022, 6:06am UTC](https://community.electricforum.com/t/66-error-code/6503/79 "2022-06-06T06:06:55Z")
I’m not exactly sure what kills a set of Field FETs, but usually the ones that go are the Armature FETs. Lack of motor service, dirty carbon packed comms, sticky brushes will produce big arcs in the Comms. This noise will eventually take out a controller.
Next time you are in there see if you can get that band clamp off the end, hit it with a blast of compressed air and get a look at your brushes, make sure they are not stuck, take a pic of the deep down innards and see how clean the comms are.
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### Author:  [@Kevin](https://community.electricforum.com/u/Kevin)
#### Post date: [June 6, 2022, 6:59pm UTC](https://community.electricforum.com/t/66-error-code/6503/80 "2022-06-06T18:59:53Z")
Was that for me? Between the references to Star Wars and auto mechanical stuff, I’m completely lost.
Would you guys recommend that I wait for someone to sell a T4 controller? Not finding much online.
And what would be the effort to swap out the existing controller? Are there special tools/programming involved?
Yesterday I drove about a mile after fully charging the battery. No signs of issues. I kept the speed between 20 - 24 mph the entire time.
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### Author:  [@JarJarJava](https://community.electricforum.com/u/JarJarJava)
#### Post date: [June 6, 2022, 7:41pm UTC](https://community.electricforum.com/t/66-error-code/6503/81 "2022-06-06T19:41:04Z")
> [@Kevin](#):
>
> Was that for me?
I believe @AssyRequired was speaking to @dougl about the failure on Doug’s T2 controller.
@Kevin - I strongly urge you to start a new thread on your 66 error as there are a few errors that are not cut and dry and may have varying reasons, the 66 error being one of them.
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