ABC light

Thanks for answering. This happens when the car is in a stopped position or really drops when the car is parked for two days not moving.

No problem. Based on that, the troubleshooting manual for your car says: 1) Gunk has built up on the seats of the valves (the shutoff valve in particular) preventing a good seal 2) The o-rings in the valve have deteriorated. Either way, fluid leaks past the valves and returns to the reservoir. Here's what the manual says to do: The first action is to change the ABC fluid filter, perform a procedure called a "rodeo" that exercises the system, and then replace the filter again. This will sometimes clear up the problem, at least temporarily. This will cost around $300. If the fluid is old, you should strongly consider having it flushed, which will cost another $200. If the filtering fails, and if you are capable of DIY repairs, then there are write-ups showing how to pull these blocks and clean them. It is also a good idea to replace the o-rings just in case one of them is the cause. Cost for this procedure is less than $100. Results vary. You last option is to have the valve block replaced. This will cost around $2,000, or around $1,250 if DIY. My personal opinion... If you're not a do-it-yourself kind of person... You'll want to just do a fluid flush, filter change, and have the valve blocks replaced. Its gonna be PRICEY, but has to be done for it to return to normal. Estimated cost will be about $2,500, but probably doesn't completely cover labor...