One problem related to crankcase (pcv) has been reported for the 2015 Jeep Grand Cherokee. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Jeep Grand Cherokee based on all problems reported for the 2015 Grand Cherokee.
We bought our Grand Cherokee at falls motor city and they offered us a free first oil change. At 7000 miles we took it in had the oil change. Dealer never reset oil light drove it home next day engine light is on. Found oil in everything. Took to another Jeep dealer they did a software update saying that was issue. That didnt fix it. Second time they changed crankcase sensor since it had oil in it. Still didnt fix it. 3rd time they replaced the crankcase cover for oil cap since it was leaking. After 7000 miles they found that the Jeep had 11 quarts of oil in it and it was supposed to only have 8 in it. The owners manual says 8 quarts but I have found online other people have has more then 8 quarts in their eco diesel. Due to this we had lost 5mpg and used excessive amount of def. Falls motor city said that there wont be any issue now that the other dealer put the correct amount of oil in it. There is still oil in everything. The mileage has gone back up some but still not getting what it used to be. Im worried now that later on down the road the motor will fail or something on the motor will fail due to oil being pushed everywhere else since it was overfilled. This all happened back in October 2015 and just the end of Jan is when everything was figured out too much oil was put in. Only thing I can think of is Chrysler messed up and had in their systems that the eco diesel was supposed to take 11 quarts and not 8 since other vehicles have had that much put in also at the dealer. It says 8 quarts in the owners manual.