Engine cranks but doesnt start in cold

These are always "fun" to track down. Basically what is happening is that the cold is causing a component/connection to shrink and fail. Once it has been warmed up the problem goes away. The issue is that it could be just about any part.
The issue could be on the fuel side or ignition.
First thing to do is narrow it down to one or the other. Rent/borrow a fuel pressure test set and run a pressure test.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If it tests okay (which I think it will) then comes the hard part. Take a common hair drier, turn it to high and start heating the individual parts. Start with the crank sensor. Located on the front of the engine near the crank pulley. Heat it a bit then try to start the engine. Next the cam sensor (rear of cylinder head) I suspect you will not need to go farther than those two. However, if they do not help, apply heat inside at the bottom of the dash in the middle aimed at the PCM up behind the dash. If it starts then the PCM is the issue.

Good luck and report back. Thanks

The power being applied that way is causing the failing component to warm up enough to operate. That is why the testing for this type of problem costs so much, takes a bunch of time.

Hey JEETAN

When the engine doesn't not start do you have fuel pressure and spark at the plugs?

Please let us know what you find so it will help others.

Best, Ken

Let's check it see if you have injector pulse, here is a guide to help you see hoe to do it.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Let me know.

HMM, didn't see Jeetans reply but saw yours Ken. Anyway, I talked to a Hyundai tech about this, First thing he said was crank sensor.
I asked him why, He said it's a common issue on them, the sensor doesn't set close enough to the crank to generate a reliable signal. Then when the car is cold the battery tends to not crank it fast enough to signal the PCM. His fix was to remove the sensor, use a swab to clean out the hole and replace the sensor with a new one. Then load test the battery and/or clean the terminals and ground connections.

He also mentioned the main control relay can cause this.