Hopefully this isn't a redundant thread but all I could find were threads on 2017 BECM failures.
I'm kind of curious how prevalent 2018 BECM failures are.
Mine occurred at 36,270 miles (300 after BtB warranty expired) and 3 weeks shy of 3 years.
Symptom:
Cruising at 30 mph, engine warning light came on. Battery charge level went from about 60% to 100% charge. Engine started. Shut down car and exited for about 30 minutes.
Upon restart, engine warning indicator remained illuminated (solid, not flashing) and charge indication was normal.
During 20 mile drive to shop, all normal (except engine fault indication).
Finding:
5 fault codes (stored but inactive) indicating BECM. (I didn't get a list of the codes.)
Shop credited the $160 diagnostic fee. Parts available. Be at shop a couple work days.
Questions:
1) The mechanic said that they've seen quite a few BECM failures for all MY gen 2s. Any other 2018 owners out there that have had failed BECMs?
2) Is it normal for a shop to replace (under warranty) an intermittently failed part, or is this just good shop?
3) I assume that the Battery cooling system fluid needs servicing after dropping the battery to replace the BECM. Does anybody know if they would flush it or just burp/service it? Is the BECM on the electronic cooling loop or the battery loop? If the former, same question about flush or service. (Obviously, I would hope for flush so I could zero time those loops.)
Thanks in advance for any feedback. (And moderators, if there are 2018 BECM threads or threads similar to this, please feel free to merge them.)
Regards,
Chris
2018 Premier
Hopefully this isn't a redundant thread but all I could find were threads on 2017 BECM failures.
I'm kind of curious how prevalent 2018 BECM failures are.
Mine occurred at 36,270 miles (300 after BtB warranty expired) and 3 weeks shy of 3 years.
Symptom:
Cruising at 30 mph, engine warning light came on. Battery charge level went from about 60% to 100% charge. Engine started. Shut down car and exited for about 30 minutes.
Upon restart, engine warning indicator remained illuminated (solid, not flashing) and charge indication was normal.
During 20 mile drive to shop, all normal (except engine fault indication).
Finding:
5 fault codes (stored but inactive) indicating BECM. (I didn't get a list of the codes.)
Shop credited the $160 diagnostic fee. Parts available. Be at shop a couple work days.
Questions:
1) The mechanic said that they've seen quite a few BECM failures for all MY gen 2s. Any other 2018 owners out there that have had failed BECMs?
2) Is it normal for a shop to replace (under warranty) an intermittently failed part, or is this just good shop?
3) I assume that the Battery cooling system fluid needs servicing after dropping the battery to replace the BECM. Does anybody know if they would flush it or just burp/service it? Is the BECM on the electronic cooling loop or the battery loop? If the former, same question about flush or service. (Obviously, I would hope for flush so I could zero time those loops.)
Thanks in advance for any feedback. (And moderators, if there are 2018 BECM threads or threads similar to this, please feel free to merge them.)
Regards,
Chris
2018 Premier, 36700 miles. Just started showing what I expect to be symptoms related to a failing BECM. CEL came on, no driveability issues. OnStar error codes...p1e00,U2619,30,21,22,23, and U2624. Would only charge for a few minutes at a time, but finally fully recharged from 95% to 100%. Day 2 -- drove a few miles normally except for CEL. Same charging problem, but did get car recharged to 100%.
Day 3 -- CEL not on!?! (No codes from OnStar). Drove 5 miles, EV miles dropped to zero, ICE came on and "reduced propulsion" message and CEL back on. (Same codes from OnStar)
Today -- still trying to recharge. When recharging, EV range shows correct miles. When charging shuts down, EV range shows zero miles but 100%.
Have service appointment on Monday (today is Wednesday).
I just connected my Battery Tender to the 12 volt battery -- wondering if it too is not being charged!?!
Not sure about build date -- I found a silver label drivers side door sill showing 10/17.
Will edit/add to this reply as more info is forthcoming.
Bob