Rest assured your incident is not isolated. Some cars have been able to dyno and others have not. In fact, one car that we had dyno'd ended up going to the dealer for some warranty work...the dealer updated the software...when it came back to us, we were no longer able to dyno it. Part of the problem (if not the whole problem) is version of DME software that engages wheel speed sensors so as a failsafe so the rear wheels are not spinning when the front wheels are stationary (read: burnout). Whereas before it would still allow for full power, I believe the new software retards the power dramatically to what you call "limp mode" even though it's not really limp mode (that's more emmissions-related). You will need a GT1 or equivalent to reset the fault codes.lvegaskiwi said:Two M5's would not MOVE at all (allow us to select "D" drive or "R" reverse) when it was time to reverse-off the dyno machine (roller). We each got an error message and so the DMS tech had to use his equipment to reset the computer (it took about 2-3 mins for the DMS tech to do whatever it was he did).
One M5 did NOT get the error message nor did it go into the "limp- mode". We guessed that it may have had something to do with him selecting the "D" drive gear and driving slightly forward BEFORE selecting the "R" reverse gear, when it was time for him to reverse-off the dyno machine.
Since that day, I have not wanted to dyno my car again! I asked PPG4 to keep me posted on this issue so I could determine whether or not our incident was an isolated one.