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Yes the display in the car will show a picture of the hybrid battery with bars indicating how much of a charge it has.
C1259 can be tripped if the service plug in the trunk for the hybrid battery has not been properly seated. If I recall correctly you need to push it in and and flip the handle. I forgot to flip the handle once. It's an easy mistake to make. Perhaps someone messed with it during your 12v battery change.
It has between 5 and 6 bars when running, fuse was checked and put in place correctly, so that doesn't seem to be the issue.
It seems that the battery is ok and plugged in. What are you using to read the codes? I'm wondering if your scanner is not picking up all the codes.
After the gas engine runs for 2 seconds and shuts off are you able to drive around using the battery?
Yes it will work on hybrid for about 20-30 seconds.
I have an Autel Maxisys MS906 BT
also what’s interesting is that the pcm only showed up once from like 5-6 reads, it would not come up on the reader every time which is weird but it still seems to work I tired the original pcm and programmed another one from my other LS 600, but still same issue.
I was reading a thread on a gs450h. Apparently it is possible for the inverter to be bad yet throw no codes. However I doubt you would be able to drive with a bad inverter. If you can get your hands on techstream you will probably be able to view more data.
I've read there is a procedure you can use to keep the gas engine running regardless of the hybrid battery state. It might be worthy to look into.
Found this video. It seems like he gives the wrong verbal instructions. If you follow his foot work you should be ok lol.
I was reading a thread on a gs450h. Apparently it is possible for the inverter to be bad yet throw no codes. However I doubt you would be able to drive with a bad inverter. If you can get your hands on techstream you will probably be able to view more data.
I've read there is a procedure you can use to keep the gas engine running regardless of the hybrid battery state. It might be worthy to look into.
Found this video. It seems like he gives the wrong verbal instructions. If you follow his foot work you should be ok lol.
If it were mine I would hope to find another stored fault code to help point you in the right direction. I've read some of the hybrid fault codes cannot be read by aftermarket readers. It seems odd to me that the gas engine shuts off after a few seconds. That sounds more like an ignition security system possibly shutting it off. Does it have any sort of aftermarket alarm or remote start? If not, the fault code U0100
is the only one I see causing it to shut off. Perhaps the engine ecm is bad, bad push to start switch, or possibly bad wiring. If there is a fuse for the ecm, I would assume there is, you could measure the voltage drop across the fuse as the engine starts. If it is a simple task to swap the engine ecu that might be where I would start. My initial guess is still that a critter nibbled on a few wires. Sorry I'm not more help.
If you can get it to start and stay running in the maintenance mode that would probably help narrow the fault down.
Techstream would also be useful to examine the temps / voltages of the inverter and hybrid battery modules. The engine ecu may also display voltage over techstream.
If it were mine I would hope to find another stored fault code to help point you in the right direction. I've read some of the hybrid fault codes cannot be read by aftermarket readers. It seems odd to me that the gas engine shuts off after a few seconds. That sounds more like an ignition security system possibly shutting it off. Does it have any sort of aftermarket alarm or remote start? If not, the fault code U0100
is the only one I see causing it to shut off. Perhaps the engine ecm is bad, bad push to start switch, or possibly bad wiring. If there is a fuse for the ecm, I would assume there is, you could measure the voltage drop across the fuse as the engine starts. If it is a simple task to swap the engine ecu that might be where I would start. My initial guess is still that a critter nibbled on a few wires. Sorry I'm not more help.
If you can get it to start and stay running in the maintenance mode that would probably help narrow the fault down.
Techstream would also be useful to examine the temps / voltages of the inverter and hybrid battery modules. The engine ecu may also display voltage over techstream.
No aftermarket alarm or remote system i do have the grom audio system connected to the stock display car worked fine before. Wires that go to hyrbid control module and pcm have been tested and have full signal so doesn't seem like that is the issue. Also the car worked fine before didn't have anykind of issues. Might just have to bite the bullet and take it to the dealer. I'll try getting it into maintenance mode tomorrow. Thanks for the suggestions everyone!
I'm experiencing the same thing with my 2009 LS 460. It tries to start for a second then nothing (all dash lights are on). If I leave it in run mode, the radiator fans come on even though it is stone cold. After sitting for hours it will try to start for another second then nothing. Battery is fully charged, terminals are clean, etc. I did connect my Techstream to it and got code U0100. Can Bus Communication issue. I got another ECM but I still have the same problem. I'm looking for solid input to avoid throwing parts at the issue. Can anyone decipher what my scan is saying?
I'm experiencing the same thing with my 2009 LS 460. It tries to start for a second then nothing (all dash lights are on). If I leave it in run mode, the radiator fans come on even though it is stone cold. After sitting for hours it will try to start for another second then nothing. Battery is fully charged, terminals are clean, etc. I did connect my Techstream to it and got code U0100. Can Bus Communication issue. I got another ECM but I still have the same problem. I'm looking for solid input to avoid throwing parts at the issue. Can anyone decipher what my scan is saying?
Interesting to see that this is not just a hybrid issue. My fans also spin right away but i had my car at a hybrid specialized shop for over a month, granted they aren't working on it full time but they still have no idea what is wrong with it.
Your car is a hybrid, but it's a Lexus hybrid. Find a shop that specializes in Lexus first, they will have Techstream.
Lexus is not the only one who has techstream, that has been checked. Like the previous user mention his is not even a hybrid but also has the same issue.
If anyone is having this following symptoms (2009 LS460):
Nothing happens when start button is pressed.
Electric fans come on when key/button is in acc position.
Check VSC system on dash
Cannot communicate with ECU.
Techstream shows U0100
Sometimes the car will actually crank (but not start) after is has been idle for some time.
What I found as the problem: Fuel pressure sensor
The fuel pressure sensor is faulty and is pulling down the 5 volt supply to the ECU, which causes all kinds of havoc.
The fuel pressure sensor is located under the intake manifold. It is quite a job to get to and replace.
Interesting to see that this is not just a hybrid issue. My fans also spin right away but i had my car at a hybrid specialized shop for over a month, granted they aren't working on it full time but they still have no idea what is wrong with it.
Hey Daveedo14, did you ever fix this issue?
I have literally the exact same issue right now and I’m kind of lost on how to fix it…. Hopefully you got good news and didn’t have to shell out a ton of cash to lexus
