XJ ( X351 ) 2009 - 2019

2015 x351 won’t start

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Old Dec 18, 2025 | 12:36 AM
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Default 2015 x351 won’t start

Can someone help me figure out why it’s doing this
 
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Old Dec 18, 2025 | 07:26 AM
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As always do some homework first? We know it's a 2015 but what about the rest of it? Engine, miles, where your at?
What is the battery voltage?
What codes does the car have?
Problems and/or history before this started?

Otherwise is all just a shot in the dark!
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Old Dec 18, 2025 | 09:21 AM
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It not throwing no new code but it’s a aj126 with 170k miles I’m going to check the volt soon. I know the aux battery needs to be replaced .
 
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Old Dec 22, 2025 | 05:35 PM
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OK Thanks. Post more details if possible as it's all we have to go on.
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Old Jan 7, 2026 | 02:13 PM
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Originally Posted by clubairth1
OK Thanks. Post more details if possible as it's all we have to go on.
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Do you think it will be worth fixing or should I get rid of it ?
 
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Old Jan 7, 2026 | 03:26 PM
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Jman84, based on the number of codes you are getting and the variety that they are, I would say to start with replacing the battery. But, before you just blankly replace a battery, I would get it load tested. If the battery is below 75% capacity, it needs to be replaced. Then obviously replace the aux battery, but really, that has nothing to do with the issues you are seeing.

Next set of questions is you are saying that the car will not start, what do you mean by that? Is the motor turning over and not catching? Does the motor just make a click when the START button is depressed? Nothing happens? Each of these leads us in different directions.

Another question that I have based on the error codes is whether you have furry creature droppings under the hood. It is very possible that you got a little critter under the hood that made a buffet of your wiring (the insulation is made with a plant based material that critters love to eat). That would lead to a lot of errors with the same few sensors. I would be looking by the firewall to see if you have a nest somewhere and if so, I bet if you pull that nest out, you are going to find a mess of the wiring that is going to turn your stomach.
 
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Old Jan 9, 2026 | 07:22 AM
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Yea don't jump the gun just yet. Follow what Thermo suggests.
Again we need more information about the car and what it's doing. Videos don't help.

Can you provided the information requested above?
What is the resting voltage of the car after it has sat all night?
What codes does the car have?
What is the history of the problems? What has been done or replaced?

If you can fill in the blanks Thermo and I have been asking for we might be able to help.
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Old Jan 10, 2026 | 11:19 AM
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Originally Posted by Thermo
Jman84, based on the number of codes you are getting and the variety that they are, I would say to start with replacing the battery. But, before you just blankly replace a battery, I would get it load tested. If the battery is below 75% capacity, it needs to be replaced. Then obviously replace the aux battery, but really, that has nothing to do with the issues you are seeing.

Next set of questions is you are saying that the car will not start, what do you mean by that? Is the motor turning over and not catching? Does the motor just make a click when the START button is depressed? Nothing happens? Each of these leads us in different directions.

Another question that I have based on the error codes is whether you have furry creature droppings under the hood. It is very possible that you got a little critter under the hood that made a buffet of your wiring (the insulation is made with a plant based material that critters love to eat). That would lead to a lot of errors with the same few sensors. I would be looking by the firewall to see if you have a nest somewhere and if so, I bet if you pull that nest out, you are going to find a mess of the wiring that is going to turn your stomach.
when I press the start button it’s just makes a sound like the starter not catching anything to engage the engine. I know the radiator went out, the car lost all power an the car came to a complete stop and started overheating I added some coolant to try to cool the engine but coolant was everything.I’m pretty sure my alternator went out thats what draining my battery,I just had my battery replaced around a year ago but I need to get it check it out.i also noticed one of the pulleys was chipped I think it’s the idler pulley but i also heard a ticking sound coming from the exhaust before the car shut off
 
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Old Jan 12, 2026 | 08:16 AM
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Are your battery ground cables in good condition?
 
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