P00B7 - Coolant flow low/performance
The code is definitely related to the coolant leak. Engine is probably on the verge of, if not already, overheating.
If the source of the leak isn't obvious, a pressure test should hopefully point it out.
2 weeks ago my coolant recovery tank cracked at the bottom outlet nipple. It wasn't covered by powertrain warranty but was thankfully a cheap and easy part to replace.