Killswitch

A Killswitch is an EMP-like device used by the Palm City Police Department and the Eden Shores Police Department to shut down the player’s vehicle making it unusable so they can box them in, and making the player unable to move. They can be avoided by using the auxiliary upgrade and it will warn you if they are using one on the bottom of your screen, in which will give you enough time to get out of the way, or use the upgrade of it is being used on you.

They appear at heat level 3 and higher and are only used by the Dodge Charger units, similar to Payback. The only ways of avoiding them is by ramming the side of the Dodge Charger unit, or by turning around and the other way as quick as possible so that you’re out of view from it being used.

If the player is hit, they will be inactive for about 5 seconds or more before their engine restarts again. Although due to this very long interval, and there is a very high chance the player will be busted anyway as the busted speed blue by default is 4. (7 seconds.) (Cheat Engine.)

There also is auxiliary upgrades so they can become immune to being struck by the Killswitches any time and can be used indefinitely.