I replaced my alternator and battery and drove for 2 days, this morning car doesn't run and I get all of these errors. I cleaned/reseated the connectors on the ECU and TCM. Is the ECU shot? What is going on? Battery and alternator both tested as good and the car goes into accessory mode no problem.

 

Battery coded properly?

Check all connections to make sure nothing loose?

Ground is good?

Battery drain?

So many things can make that happen.

 

used my gap tool to reset after battery install.
Everything is connected well
The errors appear instantly when starting on a fully charged brand new battery.
Ground would be the only thing. Do you know how to check on the LR4s?

 

Humor me, after resting overnight and without starting the engine, what is the battery voltage…
(not through odb)
If you are less than 12.6…