Fuel EXe New Fuel EX-e TQ error

[clivem25]

So, picked up a new Trek Fuel EX-E 9.5 yesterday afternoon. Got home, read the doco, downloaded the Trek Central app and went and turned the bike on for the first time to see a ERR 5401 DRV CONN message on the display. Can change screens on the display but all data fields a blank, can't change modes and the app won't pair. Worked fine at the shop when I test rode it and course by now the shop is closed so turn it off (which took 3 or 4 attempts) and walk away. Came back 10 minutes later, turn it on and everything's fine!

Turned it on again this morning just to trundle up and down the street and after a couple of hundred metres the error reappears. Still getting assist but unable to change mode and the display is showing no data.

Grrr. Back to the shop Monday I guess but has anyone else had similar?

 

[Zimmerframe]

TQ HPR50 Error Codes (searchable)

A List of TQ HPR50 Error Code Error Code Cause Corrective Measures ERR 401 DRV SW General software error Restart the system. Contact your TQ dealer if the error still occurs. ERR 403 DRV COMM Peripheral communication error Restart the system. Contact your TQ dealer if the error still...

www.emtbforums.com

About 3/4 of the way down .. could just be a loose cable ?

 

[clivem25]

TQ HPR50 Error Codes (searchable)

A List of TQ HPR50 Error Code Error Code Cause Corrective Measures ERR 401 DRV SW General software error Restart the system. Contact your TQ dealer if the error still occurs. ERR 403 DRV COMM Peripheral communication error Restart the system. Contact your TQ dealer if the error still...

www.emtbforums.com

About 3/4 of the way down .. could just be a loose cable ?

Yes, you could be right. Not feeling inclined to start pulling apart a 0km bike though.

 

[Zimmerframe]

Well, it's still always useful to know how it all works/connects together as it might help you if you ever have a problem out on the trail :

Fuel EXe - Trek Fuel EXe Service Manual MY23

For anyone wanting to have a look in the service manual, here it is in all it's glory.

www.emtbforums.com

 

[Mteam]

Sounds like the connector from the display to the motor is not connected properly.

If you want you can just unscrew the bolt that holds the display in the frame, the display then just lifts out and has two cables ,one connect to the motor the other to the controller, just check that these two connections are fully pushed together, it'll take 5 minutes and is v easy to check.

 

[volts]

unscrew the display. takes 2 minutes.

 

[clivem25]

Thanks for the suggestions. Removed the display and nothing obvious. All connectors were firmly seated but reseated them anyway. All working afterwards but the issue has already shown itself to be intermittent. Will check the connections in the lower frame tomorrow.

 

[clivem25]

Update - checked everything I can without removing the motor and error still comes and goes. Recurred today during a test ride up and down the street, Initially the bike still goes but no display and cannot change modes however after a couple of minutes the motor stopped providing any assistance. Power cycling did not restore function but after leaving for 10 minutes it was working again. Heat related?

Oh well, back to Trek tomorrow.

 

[Mteam]

Update - checked everything I can without removing the motor and error still comes and goes. Recurred today during a test ride up and down the street, Initially the bike still goes but no display and cannot change modes however after a couple of minutes the motor stopped providing any assistance. Power cycling did not restore function but after leaving for 10 minutes it was working again. Heat related?

Oh well, back to Trek tomorrow.

There are more connections at the motor end of things that could be loose/not fully pushed in , again its quite easy to get to , but you might be better just letting trek sort it out, as much of a pain as that will probably be.

 

[clivem25]

Went back to the Trek outlet and fortunately the error came up as soon as they turned the bike on. Service guy ran diagnostics on the display unit then tried to upgrade the firmware but it failed repeatedly. Ended up swapping out the display for a new one which, touch wood, appears to be working as advertised so far.

 

[clivem25]

So.... No recurrence so far on my bike but I'm currently on holiday in Derby Tasmania and hired an EX-e for the wife and what happens? ERR 5401 DRV CONN! How common is this?? Still think it might be heat related as bike had been sitting in the sun and the error subsequently went away.

Expensive trip though, she enjoyed it so much she rang up and ordered her own!

 

[Cport]

I have gotten the same code ERR 5401 DRV CONN! on my last few rides, it is intermittent but now happening more often, I purchased the bike new and have logged about 85-90 hours, its a bummer when it happens in the middle of a ride with friends. As a new eBiker I figured I would have some range anxiety, but now software anxiety on top of that sucks. Worse is all the ribbing from my analog friends ;-). I love the bike when it works. I cannot figure out what brings it on. Sometime occurs right at the start of a ride sometimes later. I could not get to work despite repeated resets and so forth. I took out the battery and reconnected, sometimes that gave me some assisted time but then reoccurs. So far, I have found no loose cables or connections. App is uptodate. I have not taken it back to Trek yet as I live about 90min from nearest Trek dealer but that is next on the list.

 

[Pean]

Hello. I have the same problem with the Tq display on the Scott Lumen. The problem is obviously related to heat. Occurs at a temperature above 25 degrees C. I checked it by gently heating the display with a hair dryer and then cooling it down. It's a manufacturing defect. My bike has traveled 60 km.

 

[Emailsucks98]

As a new eBiker I figured I would have some range anxiety, but now software anxiety on top of that sucks. Worse is all the ribbing from my analog friends ;-).

This topic deserves a thread of its own!
My last bike (shimano motor) threw similar error codes which required a restart. Often got hecKled by analog riders I had just passed. I would accuse them of using an electronics jammer or emitting microwaves.

Never had this error code on my trek personally (going on 7 months now)

 

[Kimchisup]

Adding to this thread and confirming what others have already shared. Have a brand new Trek Fuel Exe 9.8 and got the 5401 Drive Conn error on it's first ride and isolated it to a heat issue as well. Checked through all connectors and tested leaving the bike in direct sunlight to heat the display to confirm it was the issue.

Haven't taken the bike back to Trek for warranty work yet, but hoping TQ addresses the problem with fixed displays since this seems like a known issue.

 

[Tobes58]

I have had my Fuel Ex-E 9.7 for a year now and experienced that error message for the first time yesterday. I doubt it is high temperature related because my bike was on the back of the car overnight and it was 3 degrees when I started riding. I got the error code then just turned it off and on again to reset it. It hasn't been seen again... as yet.

 

[SinglePointSafety]

My Fuel Exe-9.7 has done this a few times, lose all power, turn off/on has cured it. But, has now happened on every one of the last 3 rides: rides 1 and 2, turn off/on worked, ride 3.....nope, even a total re-set (multiple times) didn't work, bike is now with LBS

 

[Rubble]

Crumbs. 9.5 coming in a few days. 1st eeb, hoping it's not a disaster!