[Engine] Limp Mode no error codes or warnings Please help.

[saskak]

You can have multiple VMs within the virtual box. They can all be XP. One for the Volvo and another for the Diagbox, so there would not be clashes. You need some hard disk space of course, but because on the XP VM I only run the diagbox, I give it ~20-30GB or less.

[ampy1]

Hi,
I'm getting desperate with my van. It is an Expert not a Berlingo but has the 1.6HDi engine.
The brief history: It was working fine but got left unused and a bit neglected during lockdown and only rarely started up. The battery died altogether and wouldn't even take a charge.
As lockdown came to an end I gave it a thorough clean up and new battery. It fired up within five revolutions. I a slight splutter for a second or two but then evened out. It has always been a harsh sounding engine leaving you no doubt it is a diesel but after a few seconds it was smoother and less harsh sounding. I took no notice at the time. When I went to move it, it would only rev to 2400rpm with a huge lack of power. Turned off and restarted but the same.
I wondered if the ECU needed to relearn due to flat battery for so long so left it running for a long while. No difference.
Plugged in my generic code reader and it came up with P1351 Glow plug and or relay fault. I checked and the all the heater plugs were dead.
I was intrigued that this would cause limp mode though. I did some googling and some people were saying yes it would because the heaters are needed to regen the DPF/FAP on vehicles that only did shorter journeys. OK, I can see the logic.
Fitted 4 new heaters and new relay, cleared the codes and checked a couple of times and they stayed clear. 
IT IS STILL IN LIMP MODE Argh!
No error codes, no dash lights, and it has not been anywhere or done anything so it can't be the turbo failed. (The vanes are free I checked)

Does anyone have any suggestions please?
I did some live checks as much as my cheap unit would do but the numbers do not mean much to me.

This were taken at idle.
Load PTC 49  (Air volume entering engine?)
MAP inHg 29.7  (Manifold Absolute Pressure?)
RPM 815
IAT 80F   (Something Air Temp?)
MAF Ib/Min 1.0    (Airflow?)
FRP (psi) 5557.5       (I take it this is fuel rail pressure)

[ampy1]

UPDATE
It was me being a bit thick. Apparently, the van is limited to 3k rpm when stationary. It was not in limp mode. Drove up the road no problem at all.
I would have bet money on it that it was not like that when I parked it up but it must have been.

[brodfather11]

Sometimes you can be caught out by built-in protection, doing what its meant to do .