A pass for a module may be potentially possible to be outweighed by other performance...however, getting just a pass in a basic maths module, while applying for economics, is very much a not good look. They would probably be expecting you to have distinctions in even the advanced maths modules for economics, because economics at degree level is necessarily mathematical and most economics degrees correspondingly require A-level Maths or equivalent, and for "top" economics unis this will usually be expected at A/A* (and also the very "top" courses for economics such as LSE, Cambridge, maybe Warwick or UCL, also normally expect the same in A-level Further Maths to be competitive).
I think if you struggle with maths at even a basic level you really need to sit down and think about whether an economics degree is a realistic option for you in terms of when (or perhaps, if) you actually get onto the degree. The mathematical prerequisites are not arbitrary ones to "filter" applicants, it's because they'll expect you to be using those maths skills throughout the course day in and day out and developing even more advanced mathematical skills in the degree. You may want to think about why you are considering economics and whether another course more aligned with your strenghts may be a better option to get you to your goal (or depending on what the goal is, also whether that goal is reasonable - no point deciding you want to be a data scientist or quant if you hate maths for example).