Check another thing off the list then...

I'm left with outlier suggestions. You have rodents that might have damaged harnesses leading to the ECU box in the engine bay? Checked fuses in the 3 different fuse boxes?

Maybe your DME failed? It's not common, but not unheard of either. You could check the electronics box it's housed in for corrosion.

Will do. This car lives outdoors so…..Mebbe.


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Is your ABS cable still disconnected? If not, disconnect and clear codes and see if it will stay out of failsafe. I know you disco'd it...but if you didn't clear the codes after disconnecting it...the ABS can still interfere. I'm the guy who had the 4.6 that would go into transfailsafe at 71 mph (and reproducible). I chased gremlins for almost a month until I looked at the Car Area Network diagram and realized the ABS and EGS could speak via the CANbus and DME. I pulled the ABS and cleared the codes and no more Trans Failsafe. Sent my ABS out for repair and all was well once I reinstalled it. Just my experience and would suggest you at least try it out. Best of luck to you! :)

Dreaded trans. Failsafe prog.
 

Thanks, yes I did disconnect for a bit. I’m not sure how to clear the ABS code, is that through the dash diagnostics? My cheap scanner doesn’t have that ability I don’t think. Creator 310+.

I do notice that when I turn the ignition key the brake pedal slumps noticeably more than it used to so you are probably on to something.

Is it the electronic part of the ABS needs rebuilding of the whole damn thing?

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I'm not familiar with that scanner so you'll have to dig in on that. If you don't clear the codes after the disconnection of the ABS, you won't really be able to see the result and determine if the ABS is part of the cause.

I'd highly recommend you purchase a Foxwell NT510/520/530 scanner if you are going to be diagnosing your X5....or install INPA on a Windows 10 laptop which will allow you to scan and to clear as well.

The c 310 from my understanding is a capable scanner, but finding the correct submenu just like with foxwell can be a challenge

Ok, while waiting on parts I had a chance to test some of the fuses and all I tested were fine. These were in the glove box.

5 Alternator
9 Srs
46 transfer case
51 ABS
54 EGS
55 ABS
63 ABS

Oddly, fuse 54 was completely missing? I replaced the 15a fuse but with no effect. I’ve have owned and driven this thing for 3 yrs with no problems but I’m baffled how what seems to be a critical fuse is a) missing b) seems to have no effect.

Current codes (other than Yellow Brake and ABS das lights include

3A no message from EGS control
82 signal,, CAN ASC/DSC
And still all four O2’s

I tried to reset the ABs code and the EGS code but the connection failed on both.

I will be replacing the alternator, the idl control valve ( was occasionally throwing a mechanical failure code) and the MAF sensor soon but frankly not optimistic.

Thanks for every opinion I get.


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Things I’ve learned.

Got into it to day and replaced the Idle Control Valve.
On reassemble I inspected the DISA valve and it’s is broke. (I think). There is 100% slack on the flap so even if it’s getting vacuum it’s not functioning. Ran out of time but will troubleshoot tomorrow.


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Look at my repair thread on my wife’s failed I fixed it for $.18

Failed DISa?


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