I have a Hyundai elantra Gt 2013. For the first time, the screen of the radio is frozen and won't shut off even if the car is. I went back to the car after 2 hours, and the screen is still lit. I'm af

This issue sounds like it could be related to a problem with the ground connection or the reverse gear sensor in your 2013 Hyundai Elantra. The radio may be losing power when the reverse gear is engaged and the car is on a hill, causing it to cut off and then come back on. Here are some things you can try:

1. Check the ground connection for the radio. Make sure it is tight and securely connected.
2. Check the wiring for the reverse gear sensor. Make sure it is properly connected and not damaged.
3. Inspect the reverse gear sensor itself to make sure it is not malfunctioning.
4. Check the voltage of the battery, low voltage can cause the system to shut off
5. If none of these solutions work, it is recommended to have your vehicle inspected by a professional mechanic.

It is also important to have a professional diagnose this issue as it could be caused by multiple other electrical issues and a proper diagnosis is needed to find the root cause and prevent further damage to your vehicle.

remove battery neg cable for 15 minutes then retry radio buttons. it will some times help with that otherwise it is internal radio issue

common issue. It either needs to be reflashed from the dealer or replaced.
Sorry for the bad news.

It is an intermittent problem with the Hyundai Elantra. So, in order to solve your car problem, here I have mentioned to few links which will tell what test or steps you should take to diagnoses you issues,
=> Elantra will not start
=> Hyundai Elantra GL Occasionally my car won start Help
If you still confuse to rectify your problem, then take a look at this video which will tell you about the 2013 Hyundai Elantra Starting Problems,

Hyundai Elantra transmission won t go into reverse m ...

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Is it getting power? Fuse good? Speakers connected? Under warranty if <60000 miles.

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try to replace it with a different CD player