Maybe, Also get the battery stress tested for impending failure.
The radio keeps its presets by a constant 12V connection not cut off by removal of the key. The current draw is only tiny.
In our car we had this fault and it was it was in the radio proper. However the auto electrician we asked said that in some cars a dying battery will drop to maybe 10V on a cold morning, and the radio is intolerant of it.
So it could be either. If the battery is less than say 3 years old it should be OK.
SOURCE: 2003 Hyundai Tiburon GT radio
I had problems with my tiburon gt when I first bought it. Radio would turn on randomly. I looked around though and found rings right above the shifter where he would set his coffee in the morning because his cups wouldn't fit. I bet they would spill now and then and ruined the radio. Simply replacing it should not cause a problem but if you have the radio out get a flashlight and take a look at the wires in the back. I had a friend whos radio would not turn off even with the key out. There was a vacuum line behind his player and it rubbed on some wires in the back and caused him to have a short. Also if you have the factory sub in the back you should still have use of it with a new head unit.
SOURCE: 2008 Hyundai i30. 2.0 litre petrol.
Interesting problem.. since not US spec. Is there a 'remote keyless (fob)' programmed for this vehicle? That's the only way to DE-arm the immobilizer (anti-theft) feature (based on US specs). Unless you have this key fob (keyless entry remote... which must also be programmed for this vehicle), the only other way is wait 5 minutes with the existing key in the ignition, then it should start (US specs). You will still need to have an 'ACTIVE' keyless remote programmed for this vehicle... otherwise, you'll continue to run into this problem.
SOURCE: hyundai i30 intake runner position sensor
Hello
The engine
and transmission in this cars drive train are fully
electronically controlled by a computer called the PCM (Power Train
Control Module). Whenever a problem like this occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump, engine coolant temperature sensor and
MAF sensor for instance) in the form of a fault code in its memory,
to read these fault codes you must have the systems memory scanned
with a special tool. Once the fault code(s) are read you then must
perform the appropriate diagnostic testing to find and resolve the
problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN
HAS DIAGNOSED THE PROBLEM TO AVOID SPEDING YOUR HARD EARNED MONEY ON
PARTS THAT MAY NOT CORRECT THE PROBLEM
Check the fuel pressure under a load first, if it is ok then try unplugging the Mass airflow sensor (MAF), if the engine runs ok (check engine light will come on) then the MAF is most likely defective.
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