Hi All. I am new to this forum and I am looking for some feedback. I have a 2012 Elantra Limited fully loaded that I inherited from my dad. It has has the push button ignition and when I go to start the engine it does not turn over right away. when it starts I have no Tachometer RPMs and the car will not upshift through the gears. I need to Manually shift up. It will however downshift automatically. Also the check engine light comes on. This only happens intermittently. When the car starts properly the check engine light resets and turns off so I have not been able to get the fault code. I have a feeling it may be a problem with the computer. Anybody have any thoughts on this?