Fault Codes – Any insight appreciated

[DeutscheAutos]

I have read many posts and appreciate this forum immensely, but just realized that I have never updated this post. While some cars on auction are a basket case, some are not. I cleaned up the fuse panel in the trunk (with contact cleaner, lol), repaired the faulty CAN wiring splice underneath which seems to be common, replaced the battery and fried radio components with used parts (PL6 / ULFMULF2 / Telematics Module and DLP Module), changed all the fluids/filters and have been driving it ever since. I adore my E70 and am so glad I took a gamble on it. Best 5K ever spent.

[randywei]

Originally Posted by DeutscheAutos

I have read many posts and appreciate this forum immensely, but just realized that I have never updated this post. While some cars on auction are a basket case, some are not. I cleaned up the fuse panel in the trunk (with contact cleaner, lol), repaired the faulty CAN wiring splice underneath which seems to be common, replaced the battery and fried radio components with used parts (PL6 / ULFMULF2 / Telematics Module and DLP Module), changed all the fluids/filters and have been driving it ever since. I adore my E70 and am so glad I took a gamble on it. Best 5K ever spent.

Where was the faulty CAN wiring splice underneath? My 2013 E70 X5 has been experiencing some KCAN faults for a while. The FRM module was recently replaced under warranty, but the KCAN faults continued and recently while I was driving it it started exhibiting odd behavior as if the FRM was failing again. Had the FRM module inspected by the dealership, but they confirmed it's functioning.

I found this article online that points to some common areas where some KCAN wires may short. Was one of these areas the locations of your wire shorting problem?

https://www.underhoodservice.com/bmw...ous-locations/

[DeutscheAutos]

Originally Posted by randywei

Where was the faulty CAN wiring splice underneath? My 2013 E70 X5 has been experiencing some KCAN faults for a while. The FRM module was recently replaced under warranty, but the KCAN faults continued and recently while I was driving it it started exhibiting odd behavior as if the FRM was failing again. Had the FRM module inspected by the dealership, but they confirmed it's functioning.

I found this article online that points to some common areas where some KCAN wires may short. Was one of these areas the locations of your wire shorting problem?

https://www.underhoodservice.com/bmw...ous-locations/

My main issue was a faulty CAN wiring splice which was an old dealer splice below the rear fuse box.

CAN faults near the steering column, center console, front passenger seat rail, passenger foot well and front sub woofers are common but that was not my issue. I will check those areas eventually but I recommend checking the faulty dealer splice as it cleared up the most serious faults that I experienced. If memory serves there is a post here that addresses that very issue.

Best of luck and keep us posted.

[randywei]

Originally Posted by DeutscheAutos

My main issue was a faulty CAN wiring splice which was an old dealer splice below the rear fuse box.

CAN faults near the steering column, center console, front passenger seat rail, passenger foot well and front sub woofers are common but that was not my issue. I will check those areas eventually but I recommend checking the faulty dealer splice as it cleared up the most serious faults that I experienced. If memory serves there is a post here that addresses that very issue.

Best of luck and keep us posted.

Thanks for this info. Will pass it along to the tech.

[randywei]

Dealership is still looking at my X5 trying to root cause the KCAN faults. I chose to take the car to the dealership instead of an indy because the FRM module was replaced under warranty in Feb so I was hoping that maybe the tech screwed up on the install or maybe that there was some wiring harness fault covered under warranty or something.

So far no luck. The foreman has been investigating various suspect areas (supposedly per BMW engineering's recommendation) and hasn't found anything yet. He checked under the rear fuse box, but didn't find anything odd. He's also been checking each of the relevant KCAN modules and no issues found with the modules yet.

Last update I got was that the foreman had removed one of the seats and was checking the wiring underneath, but found nothing that looked wrong.

These KCAN faults (persistent faults are D904, E5C4, D2C4, DE84) have been around for a while and seemed to be benign, but only in recent months did they start causing odd behaviors like christmas light dash and turn signals/dome lights not working. But it's intermittent and the next day the car will be fine.

Was hoping replacing the FRM was the root cause as symptoms pointed to FRM failure, but clearly it wasn't (although it was deemed the FRM had gone bad so good it was replaced under warranty). I've been forwarding any info I can find online regarding E70 KCAN faults to the dealership.

Very annoying.

[randywei]

Dealership got back to me and they finally found the problem. It was indeed the splice in the rear right quarter panel. They said that the wiring in the splice became disconnected so it was an open circuit. They re-soldered the wiring and then the KCAN faults disappeared.

Looks like it was the same root cause as the OP - splice underneath the fuse box in the rear right quarter panel.

Trying to get the work covered under a TSB/SIB or something, hopefully.


OP - Do you know if there was some TSB/SIB for this particular splice?

[crystalworks]

Originally Posted by randywei

Dealership got back to me and they finally found the problem. It was indeed the splice in the rear right quarter panel. They said that the wiring in the splice became disconnected so it was an open circuit. They re-soldered the wiring and then the KCAN faults disappeared.

Looks like it was the same root cause as the OP - splice underneath the fuse box in the rear right quarter panel.

Trying to get the work covered under a TSB/SIB or something, hopefully.


OP - Do you know if there was some TSB/SIB for this particular splice?

Good updates from both the OP and yourself. Is this splice in every E70 or is it related to some sort of package/option?

[DeutscheAutos]

Originally Posted by randywei

Dealership got back to me and they finally found the problem. It was indeed the splice in the rear right quarter panel. They said that the wiring in the splice became disconnected so it was an open circuit. They re-soldered the wiring and then the KCAN faults disappeared.

Looks like it was the same root cause as the OP - splice underneath the fuse box in the rear right quarter panel.

Trying to get the work covered under a TSB/SIB or something, hopefully.


OP - Do you know if there was some TSB/SIB for this particular splice?

Great news! I am not sure if there is a TSB or SIB for that splice but there certainly should be.

So glad you were able to sort it out and time to enjoy the X5 now without frustration.

[ard]

Originally Posted by DeutscheAutos

I have read many posts and appreciate this forum immensely, but just realized that I have never updated this post. While some cars on auction are a basket case, some are not. I cleaned up the fuse panel in the trunk (with contact cleaner, lol), repaired the faulty CAN wiring splice underneath which seems to be common, replaced the battery and fried radio components with used parts (PL6 / ULFMULF2 / Telematics Module and DLP Module), changed all the fluids/filters and have been driving it ever since. I adore my E70 and am so glad I took a gamble on it. Best 5K ever spent.

Just saw this. Congrats


As the post above says..>WHERE was the CAN bus damage? How did you ID this, was it a damaged factory splice or someone else spliced it??

[DeutscheAutos]

Originally Posted by ard

Just saw this. Congrats


As the post above says..>WHERE was the CAN bus damage? How did you ID this, was it a damaged factory splice or someone else spliced it??

Thanks. It was a bad dealer splice below the rear fuse panel. I noticed it when I was cleaning the fuse panel / replacing the transfer case module.