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2009 LS460 won’t start

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Old Mar 29, 2025 | 06:59 PM
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Default 2009 LS460 won’t start

Yesterday car drove fine, I parked, went to my grannies, came back down to leave and it wouldn’t start. Tried to jump it, nothing. Then I started getting dash messages, check VSC system, parking brake not available, low battery start car, then after a while the dash lights started trippin then nothing came on no lights nothing. So we disconnected the battery, got a new one, installed it this morning, all the lights are coming on everything works no more error messages, no codes on the scanner, but it still won’t start won’t even turn over. I also changed the battery in my fob prior to this incident it had been telling me low key battery contact dealership so I changed the battery. And again Still not starting.

I’ve never had any issues starting my car so I don’t think it’s the starter, everything I’m reading leads me to think I need to reprogram my fob, maybe it’s not communicating correctly??

very frustrated and not in the position to cover costly diagnostics from service techs, if anyone knows what’s happening please share I’d really appreciate it!


Update: starter fuse was blown, replaced it with jcase 30amp, but still not starting.

Last edited by LS460chic; Mar 30, 2025 at 07:13 PM.
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Old Mar 29, 2025 | 10:37 PM
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Fuel Rail Pressure Sensor. I had the same issue after I left the car on overnight. Jumped the car, was able to get it started but it turned off immediately. Then wont start after that. Reset the ECU for a few hours and it will start and shut off. No check engine light.

What happen is the fuel rail pressure sensor is bad and will short circuit the ECU.

Replaced the sensor, located under the intake manifold and everything was fixed.

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Old Mar 30, 2025 | 03:01 AM
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Have you tried touching the start button with the key fob to get the green light to start?
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Old Mar 30, 2025 | 04:24 PM
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Originally Posted by trehnhazelwoodls460
Have you tried touching the start button with the key fob to get the green light to start?

yes, tried that too
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Old Mar 30, 2025 | 04:32 PM
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Are your battery posts close to the firewall or towards the front of the car?
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Old Mar 30, 2025 | 07:06 PM
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Originally Posted by Gerf
Are your battery posts close to the firewall or towards the front of the car?
if you’re standing in front of my car my battery is on the left at the top near the windshield wipers..
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Old Mar 30, 2025 | 07:09 PM
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Originally Posted by Gerf
Are your battery posts close to the firewall or towards the front of the car?
if you’re standing in front of my car, the battery is on the left side at the top near the windshield wipers.
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Old Mar 30, 2025 | 08:13 PM
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Originally Posted by LS460chic
if you’re standing in front of my car, the battery is on the left side at the top near the windshield wipers.
There have been some people that have installed the battery cables backwards and have had issues with a few things that's why I asked about the positions of the posts thinking this may have happened. Was it installed at a shop or did you do it yourself?
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Old Apr 9, 2025 | 09:40 PM
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Originally Posted by Gerf
There have been some people that have installed the battery cables backwards and have had issues with a few things that's why I asked about the positions of the posts thinking this may have happened. Was it installed at a shop or did you do it yourself?
It hadn’t been changed since I bought the car so I installed it the same way it was installed prior to when taken off..
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Old Apr 22, 2025 | 10:41 PM
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Default Well….

It’s my starter! And of course you have to dam near drop the whole fxxxxxx engine to get to it!

Would Anyone know a shortcut without having to drop the exhaust manifold!??
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Old Apr 24, 2025 | 01:02 AM
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Originally Posted by LS460chic
It’s my starter! And of course you have to dam near drop the whole fxxxxxx engine to get to it!

Would Anyone know a shortcut without having to drop the exhaust manifold!??
that's the only way to get the starter out, you'll also need to remove the motor mount/ bracket, alternator, sway bar and oil dip stick as well. You may want to purchase new gaskets for the mani and down pipe too. Make sure you have a jack to raise the engine a bit to give more space it's not too difficult I can send a full walk through vid I found on yt to help guide you.
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Old Apr 24, 2025 | 07:15 PM
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Originally Posted by Litoescobar
that's the only way to get the starter out, you'll also need to remove the motor mount/ bracket, alternator, sway bar and oil dip stick as well. You may want to purchase new gaskets for the mani and down pipe too. Make sure you have a jack to raise the engine a bit to give more space it's not too difficult I can send a full walk through vid I found on yt to help guide you.

that would be amazing! thank you so much!!
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Old Apr 24, 2025 | 08:41 PM
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Originally Posted by LS460chic
that would be amazing! thank you so much!!
it's a 2 part vid fairly simple prcedure make sure to purchase the correct tools before taking apart. I believe in you my man!
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Old Apr 24, 2025 | 08:43 PM
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Originally Posted by LS460chic
that would be amazing! thank you so much!!
also check your starter relay/fuse under the hood on the passenger side fuse box it should be a pink 30 Amp
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Old Apr 25, 2025 | 10:11 PM
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Originally Posted by Litoescobar
also check your starter relay/fuse under the hood on the passenger side fuse box it should be a pink 30 Amp
yes, I changed the fuse and the relay as well just need to do the starter!!
thank you!
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