Reading around the forum suggests several issues linked to a D5244T cutting out or going into limp-home mode.
When cutting out under load, it seems to suggest a fueling issue, the usual culprits being, as well-documented:
- Blocked fuel filter
- Inoperational in-tank electric pump + running low on fuel
.
When cutting out at low load/revs, electrical issues have been pointed out:
- Electrical connector going into engine bay fuse box (see e.g. this, this, and this).
- Failing/failed fuel pressure sensor (see e.g. this and this)
- HP pump and/or pressure regulator (see e.g. this, this)
.
As I can't discount anything, yet, I've done the 'free' stuff first:
- Checked all unions carrying fuel to/from HP pump and gave everything a final nip.
- Disconnected battery, disconnected grey connector to the engine fuse box to look for any loose connections.
- Using contact cleaner to clean the contacts on the HP pump regulator and fuel pressure sensor.
- VIDA scan revealed ECM-2505 and ECM-2503 (low fuel pressure), which were logged from the earlier cut-outs and have been erased.
Now, I suppose, it's just a matter of running it and seeing if the problem has been resolved.