The top secret and highly classified call sheet states that the Ice Cream truck splits into two halves to avoid some kids and then leaves them a treat. Further details about whether this is a 99 or a Screwball are not available, but it does seem to prove that the character is an Autobot.
Well, Decepticons would surely not take the trouble to avoid mowing down a couple of children would they? And more to the point, they’d certainly not choose to apologise with frozen dairy products.
Source: Electric Pig