I see in the manual the Mike linked that the display screen should turn off after 15 minutes with the vehicle off. I don't have a P3 so I don't know if there are any lights left on after the screen goes out. If yours stays on though, I would call the support number in the manual and ask them about it.
1996 Suburban 4x4. 350, 4.10 3/4 ton
2005 Jayco Jay Flight 27BH
1986 Coleman Columbia Popup.
1* DW "Granny"
1* 2008 Brookside by Sunnybrook 32'
1* 2002 F250 Super Duty 7.3L PSD
Husky 16K hitch, Tekonsha P3,
Firestone Ride Rite Air Springs, Trailair Equa-Flex, Champion C46540
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