each time was it on boost for more than 40ish seconds??? while going up hill???
if so it is boost over run from turbo not auto as these muppets say
i have found that in my limps (and i have had a few is to say the least) it is the poorly programmed ecu that controls the boost as it lets it runaway and cant catch it in time then it just drops out all of the boost and you are in a whole world of shit and arse kissing right there...
can u put camper on and go up a long incline and foot to the floor so lots of boost made and keeped there
so it is pulling all the way up the hill for more than 45sec it will do it again i debt if i was a debting man
then clear the code and lights by restarting the car about 10ish times and the lights will go off by them self as the ecu is happy that the car runs fine and no turbo boost run a way is happening and ecu is happy to start normally
when car is fine and running with no lights do the exact same thing but this time about the 30 to 35 sec mark lift the right foot momentarily and then mash it to the wall again it will not go in to the limp mode this time i debt im right ...
if this test is done and it works out like I say you have a temperamental map / turbo controller like i do and you will have to live with it or change them to see if it goes away
my m8 has a brand new pc chally and it does not do it at all gggrrr gives me the shits but mine does..
so next I'm thinking of getting a new map sensor and a turbo control solenoid to test and see if it fixes mine or if it is still a software issue
saying that there might be a newer software update that he has and mine don't...
let me know how you get on..