B528

It's second time got U0100, Lost Comumunication With ECM/PCM "A" in 5 days.
Last cold night, I let engine running for 3 minutes with weak start and no code, turned engine off for 15 minutes. Then Engine failed to start until the 3rd try with Engine light on.
BlueDriver got
U0100,Lost Communication With ECM/PCM "A";
A85F Status:History-PowerOn after KI30F-Switch off;
A559 Status:History-terninal30g f cut off;
9cc5 Status:History-Misting sensor; E714 Status:History-Message(KCANowermanagement battery voltage, 3BE)
2010 528i. ignition coils and plug, starter and engine head gasket were replaced more than one year ago.
My car has battery discharge issue. I just charge it twice 1 month with BMW smart charger.

Any idea? Thanks!

seanjordan20

You need to find what is draining the battery. There are YouTube videos on how to find what is causing your parasitic battery drain. Once found then to test your battery to make sure it's good. Charge first before doing the test. The codes are not important because a weak battery can cause them.

B528

SeanJordan, thank you!
Yes. I feel my battery can't hold charge like before . Recently, it only took one hour to charge it to full instead of 4 hours.