If you attempt to start car like usual, a prompt will appear on instrument cluster saying “Key not detected. Put your foot on the brake and push the start button. I have tested this for 2 days now. If you have a second key remote, and you haven’t already done so, check to make sure this works so you can be certain it isn’t a problem with the door lock functionality. Hold key next to marked surface.” On the steering column, right below the wiper lever, there is a small indentation with a FOB-shaped icon and a signal icon above it. I have checked the Battery in the Fob and it is fine. The key fob will often have a hidden key inside, so if you don't have a physical key for your vehicle, then check the fob for a release button or switch. Half the time that one of my front doors open with the car running, the car thinks that the key fob is leaving the car and I get an "access key not detected". Last night my key fob would not open my 2011 sonata, so I took the key out and unlocked the door. I actually found this issue on another Jeep forum and that sent me down the path to test it out. The other issue you may run into is that some car doors don't have any visible place to insert a key. It eventually goes away. Press your dead key FOB flat against the indentation. Cadillac CTS / Cadillac CTS Owners Manual / Instruments and Controls / Vehicle Messages / Key and Lock Messages / ELECTRONIC KEY NOT DETECTED If the vehicle has the keyless access system, this message displays if the vehicle does not detect the presence of a transmitter when you have attempted to start the vehicle or a vehicle door has just closed. The push button can not be removed. While it should last longer than three years, any number of things could have happened to it that would kill it. The Key FOB isn't being detected for some reason, I've replaced the batteries in both FOB's and still no luck. So I am not the only person with this specific problem. 1) Defective key fob. I pushed on the brake to start the car but the message said key not detected. I have also have tried to put the FOB in the center console to see if it would recognize it but still no luck! Anybody else ever get that? I have a similar problem; no key detected. Issue: The push button start will not work even with the key in the center console. I can start the car via placing the key on steering wheel(2014 Ford Escape push-button start), but the key is never recognized to open/close, etc. I can start it with inserting the Fob in … But the RFID chip still works the same way, BUT the RFID chip is in the butt of the key FOB (the opposite end of the opening to put the key ring through). Tried disconnecting battery cable and letting it sit. 2) The key fob works but is no longer recognized by the BCM. Same thing happening to some with iPhones, too. Cell phone (Android w/Bluetooth) and key fob in different pockets - all of my issues go away - 100%. Retried to start car several times before it finally started. I can't unlock/lock the car with it or even get it into accessory mode. The key fob is still sitting in storage area below the HVAC. The car battery is within a year new. Make sure that your key fob battery is not dead. If the key is not recognized, then put it in the center console in order for the vehicle to “read” the key. You press the pushbutton with the butt of the key FOB and that puts it close enough to the antenna to energize and power the RFID chip and start the car. 2011 Sonata, Key Fob not detected. The problem started when I didn't use my car for a few months due to the coronavirus and went dead. If the backup remote is able to unlock the doors, then you know that it is a problem with the key fob and not with your vehicle’s locking system. 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