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Shimano EP8 Troubleshooting

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Shimano EP8 Troubleshooting
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flag colton221
Posted: Feb 14, 2024 at 18:28 Quote
Hi there,

My bikes been sitting for awhile (Santa Cruz Heckler 9) and I went to turn it on and nothing. So I plugged it in, and it beeps like normal flashes, the normal Shimano screen then immediately shuts off. It does that about 4 times than nothing. I checked all the connections. Any ideas? I have a video of it I’m not sure if I can post it here.
flag wilhelmryan
Posted: Feb 15, 2024 at 9:34 Quote
Sounds like a ground fault to me but if you've checked connections (and connectors) then it may not be that.

Depending on how long the bike was sitting and the charge level if there was any damage done to the battery.

You may need to take it to a shop for the dealer diagnostics.
flag isaacgsquid
O+
Posted: Feb 20, 2024 at 7:52 Quote
Hey Colton,

I had the same thing happen to mine EP8 after not riding the bike for a few months.

There is a small battery in the ON - OFF switch that recharges when you ride it. It will run out if the bike sits for a while.

I took it to my local bike shop and they showed me the fix.

Put the bike on a stand with the rear wheel off the ground, and spin the rear wheel backwards FAST. It will engage the electric motor and the bike will turn on and that will jump start that small battery.

Hope this works for you!

Isaac
flag barp
Posted: Feb 20, 2024 at 9:47 Quote
That's correct about the small battery in the control unit. The official fix for this is to plug it into the computer interface device and let it charge off of that. This is an interesting hack though, if it works.
flag garrickup
Posted: May 12, 2024 at 13:26 Quote
This hack absolutly does work. The only change I would recommend is to put your bike in the lolwest pobble gear (largest ring on your cassette) thereby allowing the pedals/cranks to move backwards faster as you rotate the read tire as fast as you can. The power button starts to light up. When it holds its ON position and you see the head unit come to life then you are done.
flag garrickup
Posted: May 12, 2024 at 13:27 Quote
garrickup wrote:
This hack absolutly does work. The only change I would recommend is to put your bike in the lowest possible gear (largest ring on your cassette) thereby allowing the pedals/cranks to move backwards faster as you rotate the rear tire as fast as you can. The power button starts to light up. When it holds its ON position and you see the head unit come to life then you are done.
flag dghirst
Posted: May 23, 2024 at 16:27 Quote
Hi,

Is this “small battery” like a coin cell battery? For example, like a 2032 coin cell. If so, does anyone know the exact location and if it is replaceable?

Thanks in advance!
flag lvdukerider
Posted: May 24, 2024 at 10:17 Quote
So the fix is essentially to "bump start" a electric bike, how ironic, but definitely a cool hack to know. Thanks for posting it up.
flag chadbrochills
O+
Posted: May 29, 2024 at 8:55 Quote
The "hack" of spinning the wheel backwards doesn't work on my '21 Heckler, tried quite a few times. I've had to bring it to my LBS a few times now for them to charge that stupid switch battery, that SHOULD be user serviceable.

I'm at the point where it's more cost effective for me to buy the box & cable needed to hook it up and charge it at home instead of driving 35-40mins across town to the LBS.

In case anyone else needs one: https://alexscycle.com/products/shimano-sm-pce02b-ewsd300-pc-interface-for-di2-steps?_pos=1136&_sid=0f0ebda1a&_ss=r
flag christon428
O+
Posted: Jun 7, 2024 at 19:36 Quote
This worked for me, and I am grateful for the heads up.
Thanks chadbrochills
flag stanyderoos
Posted: Sep 11, 2024 at 9:10 Quote
garrickup wrote:
garrickup wrote:
This hack absolutly does work. The only change I would recommend is to put your bike in the lowest possible gear (largest ring on your cassette) thereby allowing the pedals/cranks to move backwards faster as you rotate the rear tire as fast as you can. The power button starts to light up. When it holds its ON position and you see the head unit come to life then you are done.
Used this technique with succes on my wife’s Canyon Spectral:ON with the external start button. Used to charge the main battery off the bike, until one day the start button did not work allthough the main battery was fully charged. The bike mechanic told me that the small battery in the start button only get’s charged when the main battery is charged on the bike. You can’t replace the small battery of the start button, it’s encased in the resin off the start button.
flag sea-2-sky
O+ FL
Posted: Sep 29, 2024 at 21:06 Quote
This hack worked likje a charm on my 22 Bullit. Cheers!
flag wookie73
Posted: Oct 6, 2024 at 5:35 Quote
Bike wouldn't turn on just flashed Shimano splash screen on display.
Did ride anyway. Phew a workout.
Got home found this answer. Worked a treat.
Thanks Isaac

isaacgsquid wrote:
Hey Colton,

I had the same thing happen to mine EP8 after not riding the bike for a few months.

There is a small battery in the ON - OFF switch that recharges when you ride it. It will run out if the bike sits for a while.

I took it to my local bike shop and they showed me the fix.

Put the bike on a stand with the rear wheel off the ground, and spin the rear wheel backwards FAST. It will engage the electric motor and the bike will turn on and that will jump start that small battery.

Hope this works for you!

Isaac
flag lloisthierryhtui
Posted: Nov 1, 2024 at 9:44 Quote
Hello from France, thank you for your help, because my repairman seemed lost!
it works perfectly on my Canyon spectral!
flag Will-Wickham
Posted: Nov 7, 2024 at 16:13 Quote
One more happy guy here because of this hack. How can I buy you a beer? Was seeing red there for a minute...
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