I rarely work on anything under 7.5t, it's all the same to a degree! I'd go with a 'hickup' with an engine sensor/wiring, only a diagnosis check will highlight this. If your out and about, find a 'snap on' van, he will tell you who in the area has the latest after-market reader to possibly keep things cheap for you at an independant workshop. Once you've found this mechanic/ garage, (providing he's not a numpty) he should be able to give you all the code and explanations to any previously, stored, 'detected trouble codes' listed in your vehicles ECU's.
With any luck you might have an 'active' fault that he can simply put his hands on straight away. (unlikely if no dash lamp is illuminated though)
Unfortunately, without seeing/ driving the vehicle, very hard to elaborate further here. I like to keep things basic with modern vehicles, but sometimes, like in this instance, it would be quicker to take it to a main dealer to get a correct idea of where to start looking for the issue you have. Please be aware that although the vehicle is plugged in to a laptop, your final dignosis is steered by how acurately the technician can interpret the trouble code, so bear this in mind. It is just a tool to direct and assist the operator, but sometimes theres an acurate readout of a defect. You can then request how much of a task it is to remedy it. Cheers
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