2000 D2. Have flashing M/S and gear selector lights plus limp mode .I put in a new battery and it solved the problem. Drove it around for a bit and then next day back to original problem. What could cause this? Bad alternator which PO said was new? Any ideas?

 

 

there's a huge table in the rave detailing all the different possible causes for the flashing m&s. reading the transmission error code will go a long way towards a useful diagnosis.

 

2x on making sure everything is tight. I freaked out thinking my tranny was going, but it was just a loose ground that caused it to trigger limp mode. Rule out the easy/cheap stuff 1st and start digging deeper. Follow the neg cable and make sure it's tight and corrosion free beyond just at the bat terminal.