Chrysler 300M security override issue preventing the car from starting on Chrysler 300M

Some Chrysler 300M owners report experiencing security override issues that prevent their cars from starting, often triggered by using the wrong key or other factors that activate the anti-theft system. These owners find that the anti-theft light blinking on the dashboard indicates that the immobilizer system is engaged, blocking the vehicle from starting. To address this, some have successfully reset the anti-theft system by using a mechanical or spare key to turn off the blinking light. Additionally, if the security light remains flashing or steady, troubleshooting the immobilizer system may be necessary, as it is designed to prevent unauthorized vehicle operation. In certain cases where the car enters immobilizer mode, owners have reported that leaving the key in the on position for a while or disconnecting the negative battery terminal overnight can help reset the system.