Prius not starting

Does your new hybrid battery show 200 plus volts? Is your 12 volt still actually 12 volts not 11.3? And last but not least when you put the orange plug in the battery's one of the last things you do when you go to push the lever down you need to pull your finger on that lever as hard as you can stand it so it slams into its last downward position snap matter of fact you should go out to the car and do that right now and watch everything all of a sudden light up probably?!. Like go try it now or what have you when your time zone permits

 

Usually when you make those disconnections obviously everything loses communication in the car but once everything's reconnected and connected properly and that orange plug is seated correctly you should have power and whatever codes you have you have until you establish start it may be clear them and then a reboot and see if you have anything else but a lot of times it's that orange plug that gets people that last step pushing that orange thing down sometimes it has to be done rather smartly that's all I'm saying here been a few posts here where people went to the back of the car redid that and everything was golden.

 

Most "Uxxx" lost communication codes are set by blown fuses, poor ground connections, or other wiring faults. Sometimes I see a bad ecu, but that's rare.

What scantool are you using? Which ecu is setting which U code? Did the car run before the HV battery was replaced?

A fully capable scantool will list all 15 or 16 ecu's in a Gen2 Prius and report if any ecu has codes (or not) , or if any ecu doesn't respond.

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Can you save the results of the complete vehicle scan and attach it? It really helps to see the whole picture.

The hybrid control ecu says it can't talk to some ecu's. Now I want to know what can the scantool talk to.

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I'm looking for the system scan in the "report"- looks like this - this one shows all 16 ecu's on my 2006 that could talk.

If one or more can't communicate at all, they will be missing from the list.


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