Hello,

I have a persistent issue in my 2014 BMW 328xi where code P0882 "TCM Power Input Signal Low" will activate if I start the car shortly after it has been driven for awhile. If it's a cold start I will not get the code. The issue is very reproducible.

I've checked the battery: 12.6V engine off, 14.86V engine on.

After an extensive online search I think the problem could be with a relay that fails when it gets hot. I'm just not sure which relay to change. I know the TCM has a fuse but I don't think failing when hot is a failure mode for a fuse.

Thanks in advance for your help!
Tom