P0237 GT JTDm 1.9
I have been reading the other threads on this subject so will have a few things to check again, but thought I would open my own thread as all these cases vary slightly.
I have had my very late 2006 GT for just under a year (has its MOT tomorrow) and I am getting a P0237 error more frequently or earlier over this time.
I bought the car as a spares car as a back door dealer sale, its service history is missing but it did have a couple of bills in the glove box for about £1200 of work.
It had a glow plug error, airbag error, this boost error and an EGR error when I bought it.
The glow plug was a single open circuit glow plug which was replaced (although error comes up intermittently put this down to only changing one plug)
After reconnecting passenger seat airbag and clearing errors all was fine first week, ran great no errors no faults and performance great.
On way to the Alfa day last year at Beaulieu I was going up a very steep hill with 2 mates in the car and decided to overtake a line of about 50 cars and opened her up properly as I just cleared the last car the car lost all boost. I parked up switched off and back on and everything seamed fine apart from the engine control system failure notice.
Checked codes when I got home had P0237 and the EGR one. Found that the hose clip for the top boost hose was loose and the hose hanging off. Tightened and everything was fine until the next time I really opened her up and again same errors.
Stripped the EGR and cleaned up and it seamed better for a day or two then just the EGR error, so hit the EGR with a big hammer and interestingly never had an EGR error since.
However If I nail it in the upper 3 gears I still get P0237 and it comes on at much slower speeds than before.
I have connected my trusty Chinese OBD2 adapter and monitored the boost level and it boosts up nice and cleanly and hits 22.3 PSI (I don't know what the maximum is meant to be) but never exceeds this. If I am just changing up the lower gears it only briefly hits this mark then I have run out of revs and change up. In 5th and 6th I will be holding this longer and it seams that if the maximum boost is held for more than about 6-7 secs then it goes into limp mode but it stays steady at 22.3 PSI so I doubt I have a leak or actuator fault.
Far as I know it has not been remapped at any time but as there is not history, it may have been.