Trans Fail Safe with code 146

[esoxthepike]

I am new to the BMW world having purchased a 2004 X5 3.01 with Automatic. I woke to find the trans in failsafe mode and see there are tons of possible reasons for this.

The trans does not work in any gear and after putting it in gear and then pack to park, there is a short grinding noise (watch the video below).


Here is a video of what I see in the drivers seat:
https://www.dropbox.com/s/rhh8yavpro...24903.mp4?dl=0


Here is what I have done so far:


1 - Changed engione oil (it was planned anyway), plugs and gave it a new battery.
2 - Verified alternator voltage is acceptable (at the battery with car running and battery unhooked)
3 - Cleaned (although it looked clean already) the MAF filter and airbox (filter in airbox is like new)
4 - Changed trans filter and fluid. There was no metal in the pan at all.
5 - Using basic OBD II scanner I cleared old codes and restarted engine a few times. No codes returned; engine starts up and idles well.
6 - I got INPA working and scan of trans codes showed "code 146 engine torque signal". This was in german but I google translated it to english; I think it is right.

Here is the INPA Error memory errors. Perhaps that will give me some direction?

================================================== =========== Variant: D_0056 -1 Error in error memory ================================================== ================================== Variant: MS430DS0 1 Error in error memory
Error registration 1 : 0x0008: Luftmassenmesser <<<<!!!
Error accurances: 1
Logistic counter : 40
Error accure 1st time at:
N_32 1408.00 rpm
THR 21.11 Grad TPS
ISAPWM_ISA 57.42 %
VMAF 0.02 V
aufgetreten vor (rel. BZ) 0.00 h
---
KS--> Masse o. Unterbrechung
---
---
Fehler ist abgasrelevant
Fehler entprellt
Fehler momentan vorhanden
statischer Fehler
Error code: 08 72 01 28 2C 1B 93 01 35 95 ================================================== ==================================

================================================== ================================== Variant: IKI 1 Error in error memory
Error registration 1 : 0x008D: Signal AGS : Telegrammfehler oder kein Telegramm <<<<!!!
Error accurances: 40
--
--
--
--
Fehler momentan vorhanden
--
Fehler durch externes Steuergeraet
Error code: 8D 50 28 ================================================== ================================== Variant: D_00B0 -1 Error in error memory ================================================== ================================== Variant: IHKA39_5 1 Error in error memory
Error registration 1 : 0x001F: Wasserventil links <<<<!!!
Error accurances: 10
--
Kurzschluss gegen Masse
--
--
Fehler momentan vorhanden
-- Error code: 1F 42 0A 21 21 06 A2 41 10 03 76 ================================================== ==================================



I did notice that the large plug connector on the trans has come un-bundled but all the wires look fine to me. I think I will need to replace this harness regardless in the near term.
Here is a pic of that...
https://www.dropbox.com/s/udbjor8qc4...51234.jpg?dl=0


Ask questions if you have them as I need to get this back on the road.


Thanks in advance!

[esoxthepike]

So I replaced the Mass airflow sensor and cleared all the codes. Limp mode is gone now and the car goes into gear.

That is the good news. The bad news is that the car is still coding P1447, engine running rough, smells lean and does not seem to have power it should.

[jclausen]

Smoke check the intake system

[goinstrong]

The intake boot is notorious for having splits along the accordion section. I found my split on the underside, when visibly, it had looked fine. While it helped, the thing that really made the difference was spraying the air intake temperature sensor with brake cleaner. Mine is a 2001, so your location might be different. Mine was on the top of the intake manifold, right in the middle. There is an electrical plug to remove, and then a tab to squeeze, and it will come right out. Mine was full of gunk, but it cleaned up nicely. If not, FCP Euro has them in stock. It made all the difference for me. I had already done the MAF cleaner, then replacement with minimal change. Hope this helps!
Tim