2014 P85d High Voltage Failure

[jonnymorrow]

Amazing write up. I have BMS_u029 error. Gonna drop my 14 module 2013 Model S60 and replace module #9 showing low voltage on one brick. What are people liking for tools to remove the lid? Anyone used an oscilating tool yet? Thanks all!

 

[Arctic_Fox]

When was your MS built in 2014? Mid 2014 or late 2014?

 

[mr_hyde]

Amazing write up. I have BMS_u029 error. Gonna drop my 14 module 2013 Model S60 and replace module #9 showing low voltage on one brick. What are people liking for tools to remove the lid? Anyone used an oscilating tool yet? Thanks all!

Gruber has a video showing an oscilating tool. The blade needs a step in it to work correctly. I used the side of a breaker bar which wasn't ideal. Also - I also cut one of the coolant tubes during the lid removal which caused a giant PITA so proceed carefully. Some of the coolant tubes can be right at the union of the lid and the case.

 

[mr_hyde]

When was your MS built in 2014? Mid 2014 or late 2014?

My 2014 was December 2014 but the battery was replaced in Q1-2015. It was a new pack and I'm not sure 'why'. The original owner mentioned it, but I didn't know enough at the time to ask more details.

 

[Arctic_Fox]

My 2014 was December 2014 but the battery was replaced in Q1-2015. It was a new pack and I'm not sure 'why'. The original owner mentioned it, but I didn't know enough at the time to ask more details.

Nice. In some ways I wish I had more time and a garage to work on the pack my self (have knowledge and skill) but it was almost cheaper to buy a new M3P. I miss the off the line torque the P85D Ludicrous had, but not the fall off after 30 mph.

Apparently after charging to 50% the day before an unrelated Service Appointment (window seal and motor check), battery gave errors on the way to the Service Center then it wouldn't take a charge while it was in their hands and they then told me the battery was shorted. Two banks had 2.7-2.8v probably due to a couple bad cells and drained the battery to 0% within a few days. So odd that I take it in working fine then it wasn't able to drive out. I would have happily converted to a 350v pack, but like I said, shop or garage access is key.

 

[mr_hyde]

I bet you a six pack of your choice the two 'bad' bricks were totally fine and the capacitors on that BMB just rotted out. There is no way 148 cells each dropped a full volt without the fire department being aware.

 

[Arctic_Fox]

I bet you a six pack of your choice the two 'bad' bricks were totally fine and the capacitors on that BMB just rotted out. There is no way 148 cells each dropped a full volt without the fire department being aware.

LOL. Dammit.

 

[r1singh]

Mack,

Since you have the pack open, I would recommend checking all of the modules carefully. There are 112 sensor wire connections plus the BMB boards to check. I poked all of mine with a plastic tool, cleaned each with 200 proof alcohol and recoated each with another layer of conformal coating to help insure no moisture gets in. I did the same with the capacitors on each BMB. It took a lot of time (10 hours?), but when one thing fails in these, there are a LOT of similar connections/components that could be right behind.

View attachment 1005448

I am in process of removing the modules