Put a new battery on car , 2008 dts says battery saver on and will not crank after a few hours

Question edited for clarity.
Question moved to model category.

Cadillac DTS (2005-2011) fuses and relays

Fuse Box Diagrams https://fuse-box.info > cadillac > cadillac-dts-2005-20...

Fuse box diagram (location and assignment of electrical fuses and relays) for Cadillac DTS (2005, 2006, 2007, 2008, 2009, 2010, 2011).

Some ideas here, but most deal with NO crank, no start.

https://www.google.com/search?q=2006+Cadillac+DTS+crank+no+start

It is a highly complex vehicle, you need an auto electrician with a pro grade scan tool computer to diagnose what electrics aren't working

https://www.google.com/search?q=mobile+auto+electrician+near+me

..

Hi Joan Whittaker,what does no crank mean.
the starter motor is dead? some posters call d crank= running engine.
which engine there? cranks fast but will not start.
underhood fuse box f24 blown?
step 2 after all fuses checked is:
shift to Neutral see if that allows cranking per my red circle below
is PCM control.
is the dash IMMO lamp happy?

as you can see the pcm decides to do the cranking or not
via its starter relay.
if you scanned the PCM it will tell you why it id not start.
immo error OR A/t PRNDL (TRS) ERRORS. OOPS




the IMMO page in your users guide covers IMMO
if key 1 fails try key2, car came with 2 keys new.
READ ALL PAGES ON IMMO FIRST

If the engine does not start and the Security System
Light comes on
Security System Light (CLUSTER LAMP ICON LOOKS LIKE CAR CUT IN HALF WITH A PADLOCK, never ignore this lamp.
This light flashes when the Theft
Deterrent System has been
activated.



https://www.manualslib.com/manual/1078925/Cadillac-Cts.html?page=256

Question edited for clarity and add maker.
Question moved to model category.

Check out the videos

https://www.google.com/search?q=2008+Cadillac+DTS.+replace+motor+mounts

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It doesn't have a fuel filter as a replaceable item.

Fuel Filter Location ' Cadillac Owners Forum - Cadillac Forums

www.cadillacforums.com > threads > fuel-filter-location...

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where is the fuel filter located on 2006 cadillac DTS - RepairPal

repairpal.com > where-is-the-fuel-filter-located-on-200...

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Does the engine spin when you turn the key to start ? A engine cranks - no start or a no crank - no start ? How to Diagnose an Engine that Turns Over and Cranks But Does Not Start...

Well if the vehicle starts even for a few seconds .That means you are getting fuel and electrictal supply to give you a spark through the coils wires and disturbuter at least start up .
Then you say you let it sit a few hr's and it starts again
Why did you have to put a new battery in it If it starts fine .
You have a problem with your fuel system not delivering enough fuel .
You can pretty much rule out the electrical system the battery turns the starting motor .
The vehicle it 08 not really old enough for a fuel pump to go but fuel filters clog and that will damage the pump aswell and cause a condution similiar to what you have described and while your at it take out the air filter that will help to .
Give this a try follow the fuel lines from the pump to the engine you will see a fuel filter change it .The vehicle will likely run again
For 10 to 20 dollars out of pocket

just because. the glow plugs are new, does not mean they work correctly, not at all. (yes, they can have weak or now power to them)
1: glow plugs work. really.
2: fueling correct. (fuel filter new, ?)
3: hearty battery and starter cranks nice and fast.

1,2,3, if not scan it.

That symbol means low voltage in the system, you have a dead or defective battery. These new sealed batteries can go out of the blue, starts fine and then a few minutes or hours later nothing, no crank no start. You can confirm the battery is the problem by honking the horn, it will dribble out a noise or not work at all if the battery is dead or nearly dead.

the alternator as got one way diodes in it. charge up the battery and disconnect the negative battery terminal for a few hours etc, put the lead back on , if it starts you need a new alternator, the alternator will of been discharging to earth when not running, good luck.

When the key is held in the start position for .4 seconds. The pcm/ecm has a start timer, it will crank until timer is timed out even though you release the key. That is normal. I don't know how long the timer runs?

As far as vehicle starting, check the basics. If it cranks good but won't start, have a helper crank it while you check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse. Any applicable trouble codes? I can only help with testing.