Cold start cranking taking progressively longer.

[HBTD]

Sounds like the battery storage (AMP) cold-cranking power. Could be failing to store the energy it takes to turn the motor over.

The voltage reading seen may very well be what is known as a surface charge.

The only real way to diag is with a load test of the battery.

What is the battery brand & model type in the car now?

One more question, when starting the car. Do you allow a moment for the electronics to boot (stabilize)?

Or press a button going for the start with one quick jab. Not a great way to start the car.

The start button is not a light switch and does not operate the same The computer in the car and everything that has a computer.

Runs a post @ power on, checking the hardware and system parameters. That being things like sensors or battery voltage.

When they pass the post, the computer is ready processes proceed...... in this case motor turns over.

This is quick but jabbing the start button quickly can ask the computer to turn over the motor before it's done posting. The result the user finds a slight delay

"taking longer to start" is the delay occurring from the time you push the start button to the time the motor turns over.

OR the motor is turning over slower?

The battery is a duralast from autozone.
When I get in the car, I depress the brake, then push the starter button. I don't wait a specific time, but I haven't changed my routine. The delay is in the motor catching and starting, not the time before it starts cranking. It is not long but noticeably different than before, almost like when I used to have cars with a carburetor, sometimes you have to crank it a while before it catches and starts. I'll try to check with the voltmeter when the artic blast is over (car is garaged but it will still be abnormally cold tomorrow AM).

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[Cory S]

Not voltmeter, gauge on dash prior to actually starting.

I believe with ignition on, I still get readings of 12.2-12.6 on the dash before starting.

 

[Rapid Red]

The battery is a duralast from autozone.
When I get in the car, I depress the brake, then push the starter button. I don't wait a specific time, but I haven't changed my routine. The delay is in the motor catching and starting, not the time before it starts cranking. It is not long but noticeably different than before, almost like when I used to have cars with a carburetor, sometimes you have to crank it a while before it catches and starts. I'll try to check with the voltmeter when the artic blast is over (car is garaged but it will still be abnormally cold tomorrow AM).

See that sounds like a fuel problem using that description. After it is driven it clears up and starts every time?

Sitting overnight it's back, FI cars have a check valve, on the fuel pump or can be in the supply line for the fuel rail. It keeps the fuel from running back into the tank.

Might try turning it over, cycling the ignition, and see if it starts quicker.

 

[HBTD]

See that sounds like a fuel problem using that description. After it is driven it clears up and starts every time?

Sitting overnight it's back, FI cars have a check valve, on the fuel pump or can be in the supply line for the fuel rail. It keeps the fuel from running back into the tank.

Might try turning it over, cycling the ignition, and see if it starts quicker.

Yes, after I start it I can shut it off and restart and it starts normally. Even after it sits all day at work, starts fine in the afternoon/evening. Just seems to be sitting overnight or for a few days if I don't drive it when I'm on vacation or using my wife's car.

 

[Rapid Red]

That sounds like a fuel problem, 2015 could be smart enough to throw a code.

Have it checked, you can get around it. Or run your own test.

Turn on the ignition, without starting. Give the fuel pump a bit of time to charge the system, then start it.

Might take a few tries to figure out the timing. You find that, and it is repeatable, you have the answer.

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