You have a critical STOP error.
2:004 shouldn't stop an RRE from driving, are there any other error codes?
Look next to the 2:004 & see if theres a little arrow pointing up showing there is more then 1 current error flagged - scroll the display with the arrow keys if there are to show the other error codes.
One important thing to check as its a BT truck - is the STEERING working?
If the steering isn't working the safety logic wont release the parking brake or allow traction.
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