Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
The first thing you should check is the battery voltage and battery connections. If you didn't even get the headlights to come on then the problem is most likely not the immobilizer. The immobilizer just keeps the vehicle from starting, but it still allows you to turn on all of the electrical accessories.
Has the battery been replaced recently?
To clarify, when it won't start it acts like there is no voltage at all right?
Can you test for resistance from the battery posts to the terminal clamps?
I'm sorry, what do you mean "is that it?"
Oh ok. I thought you mean that you have no power at all to the vehicle. That was throwing me off.
You may actually have an immobilizer issue. If you just changed the key fob batteries and nothing changed then the transducer (the part that picks up the signal from the key) might be at fault. The transceiver in the key might be the problem as well, but usually a new battery will make them come back to life for at least a little while.
I'll be in the middle of a meeting here at work (my real job).
I don't close the question until you get the answer you want. I'm not sure how the billing works.
I am not directly employed by just answer, as experts we are contractors and only get paid when the customer accepts our answer.
If we aren't able to arrive at an answer that you accept I can opt out and see if another expert can help, or you can request a refund from customer service.