Can Car Insurance Be Cancelled Without Notice? 
In a word , no . I assume you are talking about an insurance company cancelling a policy . Insurance is regulated by each state 's Insurance Department and the laws within that state . Here in Connecticut , if a company is going to cancel or non-renew a policy , then they are required to give 30 day 's advance notice of that action . Check your state or talk to your Insurance Professional , but I suspect you will find that to be fairly standard . 