Long post ahead!
I posted back in October with a fault I was having with my van (2009 2.4 115), after an hour or so of driving it would lose the rev counter and speedometer, the powertrain, engine management, spanner and esp light would come on, the mileage and trip would go to ------- and the engine would idle fine but run erratically when driving, kangarooing, speeding up too much on light throttle, pauses in power after gearchanges and much reduced power.
I replaced the one older battery (so had one new battery, one that was 6 months old) and had them tested which was ok.
Got a Bluetooth obd adaptor and Torque, and by coincidence it stopped doing it.
A couple of weeks ago when the weather was hot, it did it again for one journey, immediately after it was started. Then ok again.
Now it does it occasionally but much less severe, just the pause in power after gearchanges now and intermittent loss of Speedo and rev counter. If I watch Torque at the same time, the rev counter continues to show correct revs, but when the Speedo drops to 0 on the dashboard, it drops to 0 in Torque.
For what its worth, torque also shows ECU voltage and obd voltage which are always the same as each other at about 14.4v
I do now have a faulty egr valve. It causes the engine management light to be on all the time. When I had the problem before I did not have a faulty egr valve. Quite odd but before the egr valve became faulty (or at least before the engine light came on and the sawing noise changed - its more of a screeching noise now) the van did used to smoke a bit when accelerating, now it never smokes.
I have the following fault codes P1796 U0140 P0100 P1102