5 mile school run trips each day will never complete a regen and will lead to significant problems and expense. Unfortunately, every 500 miles (max) you need a 2000+rpm continuous drive on a trunk road in 4th for at least 15 miles to get the engine hot which will clean the DPF and also burn out any moisture/condensation within the engine and exhaust system. The trade call it "an Italian tune-up" apparently. If you have to keep stopping and starting you will have to start the process all over again ASAP. It's a nuisance but there is no alternative (unless the innards are removed from the DPF, in which case look up previous posts) and this applies to all big diesels - not just Antaras. Do you have the correct owners' manual for the vehicle? The light only comes on at startup or when there is a DPF fault, so it seems you are lucky at the moment. From reading these pages for a while I suspect a number of people's problems arise from ignoring the DPF regen process - either them or a previous owner.
2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.