Electronic control unit problems

Electronic control unit: Engine Control Unit. It regulates all the aspects related to the engine's proper functioning.
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2013 Hyundai Elantra limited push button cranks but won't start

Hyundai Elantra 2013  169 miles
I have a 2013 Elantra limited. It's a push button start. It does not have a key start. The car does not start. It cranks up but will not turn over. The security light stays on. It supposed to go off after 3 seconds. A mechanic told me that if the security yellow light with the picture of a car and a key stay on, that keeps the car from starting. I change batteries in hob. I tried both key hob and held key to ignition switch and it still won't start. I believe the problem is with the immobilizer or the key hob. I think one of them needs reprogramming. But i am not sure.
pontig6 from United States 2 years ago  
PO
Rank 10
14 reports 
pontig6 from United States 2 years ago
Car crank’s but don’t start. Security light stays on. I check all relays and fuses and reprogram keys and had locksmith scan car with computer and car 2013 Elantra still won’t start... there is no codes in scan tools
Bible from other 10 months ago
Please help me out.im having the same problem
pasos from United States 2 days ago
2013 elantra was parked in a lot that got flooded. trunk opened, windows rolled down, and all lights came on. now the car won't start at all. the bcm, mds, smart key assembly were changed. now all lights come but engine won't start,
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Starting problem.

Hyundai Elantra 2006 2.? 249000 miles
Battery light came on, went off parked it. Get in the next day and radio wasn't working. Drove it, got out went to leave, radio worked, low beams went out. Went to troubleshoot the low beams, heard a hissing from the battery, put new one in, didn't start, had the alternator checked, bad, so replaced it, still no start. Took the starter in to get checked. It passed. So I waa thinking it's a loose wire or a bad ground or something. Or the ecu. Took the ecu out and it looked good, (no obvious burn marks. Haven't found any loose connections or bad grounds. Not sure what to do next, I wanna try everything before I send in the ecu, it's expensive. I'd hate to send it in and pay, and there not be anything wrong with it. Any ideas moving forward??
Sharedconfusion from United States 3 months ago  
SH
1 report 
Sharedconfusion from United States 3 months ago
I changed out the relays and it started. There is a drain on the battery somewhere I think
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Fully locked out of car

Hyundai Elantra 2015  118 miles
Is there a security feature?
I was doing some re-wiring and completed it. The next day I went to go to work and I am completely locked out of car. My keyless entry will not work now will my physical key
Signed:lost and confused
Frank from Canada 6 years ago  
FR
1 report 
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