170 mA is not out of line if there is some small current draw for vehicle systems, such as radio, clock, electronics always-on memories systems, maybe even gps for E911. Mine draws about 70 mA.
That said, if you use the vehicle at least a couple times a week, the battery won't even notice this draw.
By the way, how does a clamp-on ammeter measure DC current? AC yes, but DC?
Sorry........but i disagree with the above if the measure current draw of 170ma is done with an accurate meter and measured after the CAN system goes to sleep ........then 170ma is too high and some device is staying on. Assuming normal accessories, if something was added alarm, blue tooth, navi, etc 170ma could be normal for that setup but could cause problems because it is excessive especially for a single battery.
Normal parasitic draw should close to 50ma +\- 20ma. 170ma draw has the potential to run the battery down to a no start condition if the van is left parked for several days. By several days I would guess 5 to 7 days depending on many variables including battery size, condition, temp etc.
If the van is run daily 170ma draw would not normally be noticed. A normal modern car will draw 20-50ma. There are other threads on this topic.........another manufacture had blue tooth phone connection staying on ......drawing 200-250 ma typical customer complaint was leave my car at the airport.......4 days later come back to no start.
Radio or internal parts in the radio staying on after key off is a common problem........but testing is the only way to determine what circuit and what device on the circuit is staying active.
It is common for the CAN system to stay active for several minutes after key off.......then the system will go to sleep..........so it is important to watch the draw over time. Other manufactures CAN system can stay active for 20 minutes.
The quality of the tool and technique used to measure draw is critical in determining what is excessive.
