Resetting the antitheft system on a 2015 Chevy Tahoe takes about 30 minutes to do. It's important to note that You will not be able to start Your vehicle during this process. Begin by turning the key in the ignition to the ON position. Attempt to start the engine. It won't start since the antitheft system has been engaged, so turn the key back to ON. After the SECURITY light comes on, wait for 10 minutes before turning the light off. Turn the ignition to OFF. After 10 seconds, turn the ignition to ON again. Once again, attempt to start the vehicle. There is a chance it will start now. In this case, the system has been reset. If it doesn't, repeat all the steps again. It could take as many as three attempts for the system to actually reset and allow You to start the engine.
Dollie T
July 16, 2020
To reset the anti theft security alarm on the 2015 Chevy tahoe you need to lock all the doors, then unlock the driver side and put the key into the on position. Now turn it off and then back on twice and it will reset. If the immobilizer is messed up then the alarm will not work.
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