Hello,
I have scanned codes from my ECU, CEM, and BCM. I see a 'signal missing,' a 'Faulty signal,' a 'Communication with...,' and a 'signal too low.' Does this signify that my TCM may be bad?

 

No - not going to be that simple. Clear the codes and see what comes back first. Does everything controlled by those modules (that are not communicating with each other) work?

 

Everything cleared except for the codes from my BCM, U010000, U012600, and U030000.

 

I did not look up those codes - but depending on what year and model you have - Bad solder connections in ABS modules are very common. (pumps fail also) The solution is a replacement ABS module (or fix the bad solder joints) Some cars require either a software download to make a NEW module to work, or a company such as xemodex can make a reubuilt unit work in your car (if they have the VIN)

 

2008 Volvo XC90, 3.2 Cyl, two-wheel drive
VIN:YV4CN982X81449164
If the codes from the BCM won't clear, does that mean it is not working?
My BCM is currently being sent back from XeMoDex, their test said that it was ok so I skipped on the repair.
I'm still trying to get my car to start. It runs for 40 mins and then turns off. I think I finally got the car to no longer have the low fuel pressure code by having XeMoDex transfer my ECU; but it either runs for a short time or won't start at all.
Is it possible that a faulty BCM or any other control module could disrupt other systems in the car that have nothing to do with it?

 

Put a brand-new Volvo fuel pump in the car. All is well at the moment.