Ghost in the Machine
Have a 2017 RAV4 Hybrid. Been having an intermittent issue. Will have a Service hybrid system message along with a bunch of warning light. Codes are as follows. U0140, B126A, U0100, U0101, U0120, U0151, U0155, U0164, U023A, U0293, U0327, U0142, C1A50, C1A63.
Quite the list... Anyway I know an issue in one module can set many other codes in different modules. So the codes that seems the be the root of this issue is U0140 Communication error from body ECU to hybrid vehicle ECU and U0142 lost commutation with body control module B. I read that is battery voltage falls near or below 11v this issue can happen. Had the original battery from 2017 so I replaced it. Cleared codes. And didn't have a issue for a month. Until today. When the codes listed reappeared. So began checking power and grounds for the ECU. All present.
This time I cleared the codes and didn't do any work of any kind. Drove my RAV4 all over for the day. Nothing. No message, no codes.
So my question is WTF. Has any one out there had this issue? What was the resolution? Or where did you start looking to find the problem?