VERY High DPF Pressure Still After Successful Regeneration?

[chadilax]

I had multiple errors related to the diesel system and poor engine performance. After some research and purchasing BimmerLink, I was able to get a successful DPF regeneration, which hadn't naturally occurred for quite some time (~7k miles). I had to constantly read the errors, delete the errors, to keep the Regen going.

After the regen, the soot mass dropped from the 97g to 3g and no new diesel system errors! The car ran a lot better and we were thrilled. However, the Exhaust Pressure before DPF and Differential Pressure are still VERY high from what I've found.

At Idle:

• Pressure Before DPF: 900mbar, max expected: 35mbar, 24x higher!
• Differential: 80mbar

At: 2,600 rpm

• Pressure Before DPF: 1,303mbar, max expected: 100mbar, 13x higher!
• Differential: 452mbar

The next day, started having performance issues again and got an uninformative error on the screen of "Drivetrain: ________ Continued Driving Possible. Consult Service Center". Normally, I've seen something come after the "Drivetrain: " part, but this was blank. Hooked up BimmerLink and no permanent errors, not Diesel System errors in Error Memory or Info Memory. And Soot Mass back up to 97g.

The full scan for errors just showed 7, but none explicitly for engine issues:

Central Gateway Module
5 errors
100600: Flexray protocol startup time is too high
100100: Contact to FZM slave lost
100104: HW Weckgrund ZGW
100203: DM software error info warning
100204: Message monitoring: no system context signal

Body Domain Controller
2 errors
80402C: NVM EEPROM driver error
8040BC: IBS Wakeup: implausible wake-up signal

1. How can the pressure be so high and no errors? Bad/miscalibrated Sensor?
2. What is this generic "Drivetrain" error on the screen but no corresponding errors in BimmerLink?
3. Is it normal for Soot Mass to again rise back up to 97g in a single day (drove about 50 miles)?