Just has this occur and couldn’t find the exact error code (dis_w126) anywhere online so I thought I’d share. Coming off a supercharger I suddenly got a turtle icon and error: Car Needs Service, Power Reduced dis_w126
My 2019 MX would then only go 63mph on the freeway and steering wheel reset didn’t fix it. Called Tesla roadside and they verified everything was safe and said to try a full power cycle (which did fix the problem). TESLA service just checked everything out and it appeared to come from a glitch in the battery coolant monitor when it was charging.
Waiting to see if it happens again...
My 2019 MX would then only go 63mph on the freeway and steering wheel reset didn’t fix it. Called Tesla roadside and they verified everything was safe and said to try a full power cycle (which did fix the problem). TESLA service just checked everything out and it appeared to come from a glitch in the battery coolant monitor when it was charging.
Waiting to see if it happens again...