Bosch Gen4 Error code 603

dixie600mhz

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Location
Austin, Texas
Driving home last night on 2021 Rail 9.8XT I'm having a blast. Pop the bike from emtb to turbo mode and got a 603 error about 5 minutes in. The battery was at about 60% charge.

Error 603, please contact your dealer. So the bike is in limp mode. I pull the battery and reseat, reboot and we're back in business and all is well. I make it home with assist in emtb mode.

This morning I was about 8 miles into a ride in emtb, no issues. Pop it into turbo and after a few minutes error 603. I got past it again by pulling the battery and rebooting. The bike has about 300 miles on it.

It looks like the 603 is a general battery pack error. It only seems to happen in turbo, but I notice it's $1k for a new battery. Time for a warranty claim?
 
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After months of fighting this problem the fix was to update the battery/motor firmware to 2022 release. No more error code or shutdowns with the same battery.
 
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