My brother lives a state away and has a 2013 Jeep Cherokee 3.6l

It had a miss and took to a shop it's coming up with P0302, P0520, P0522 codes.
Still missing after a plug change.

I am assuming the P0520 & P0522 might be related to the known oil cooler issues.

Does this engine have any known problems with lifters like the Hemi's or other unique issues that could cause the miss?
Could it be the oil cooler?

If I were closer I would do the usual compression, leakdown, injector, coil etc etc tests but I am not.

Hoping to give him good news from someone who has had more experience with those V6's.

Thanks.

Unfortunately, yes, they also suffer from a very, very common lifter problem. And they are known to eat cams too. Lifters in the 6 are referred to as tappets if I'm not mistaken. Many can be replaced without removing the timing chain/cam/gears.....

Just a heads up- the lifters/tappets are the roller rockers......

TO: Dealer Principal, Service Manager,
Service Advisor and Warranty Claims
Administrator
SUBJECT: (X56) - 3.6L Left Cylinder
Head - Select 2011 -2013 Vehicles
PURPOSE:
CHRYSLER GROUP LLC
NO: D-14-12
DATE' June 10, 2014
FOR: Al l U.S. Dealers
All U.S. Business Centers
To announce an Extended Warranty on the 3.6L Left Cylinder Head in an effort to monitor and correct
quality issues in a timely and efficient manner.
The warranty extension coverage period is 10 years/ 150,000 miles (whichever occurs first)
from the vehicles In-Service Date.
Applicable Vehicles:
2011 Vehicles:
Jeep Grand Cherokee (WK); Dodge Durango (WO); Town and Country I Caravan (RT); Dodge Avenger
(JS); Dodge Journey (JC); Dodge Challenger (LC); Dodge Charger (LO); Chrysler 300 (LX)
2012 Vehicles:
Jeep Grand Cherokee (WK); Jeep Wrangler (JK); Dodge Durango (WO); Town and Country I Caravan
(RT); Dodge Avenger (JS); Dodge Journey (JC); Dodge Challenger (LC); Dodge Charger (LD); Chrysler
300 (LX)
Select 2013 Vehicles:
Jeep Grand Cherokee (WK); Dodge Durango (WO); Jeep Wrangler (JK); Town and Country I Caravan
(RT); Dodge Avenger (JS); Dodge Journey (JC); Dodge Challenger (LC); Dodge Charger (LO); Chrysler
300 (LX)
TIMING:
Effective Immediately
ACTION:
Always check Dea/erCONNECT> V/Pto verify if a vehicle is involved in this warranty extension. A
vehicle involved in this Warranty Extension will display an (X56) 3.6l left Cylinder Head message in
VIP. If no (X56) coverage message displays in DealerCONNECT> VIP, no further action is required on

Ouch....

Thank you for the information even though it isn't what I want to hear.
Better the truth.

The warranty extension head. Is it a different head or just a reman to get another 150k out of the engine?

Hmm, the Jeep is 11 years old and has how many miles?

What was the original warranty period and mileage?

At what point do you think Chrysler should not have to deal with it anymore?

It's not about Chrysler dealing with it. Its got 168k on it and not Chrysler's problem.

I'm trying to figure out do I need to replace the head with an updated model like BMW did with their 3.0 heads, or just do a valve job on the existing head(s).

Hence the reason I asked if the warranty replacement head was the same or different than the original one.

Sorry if I wasn't clear on that.

In their literature it states "a more robust" head

You were clear. I was just answering this question "Does this engine have any known problems with lifters like the Hemi's or other unique issues that could cause the miss?
Could it be the oil cooler" ?

Awesome Larry

Thanks.

Assuming that since the warranty extension was only to 2013 I assume the 2014 and later have the more "Robust" Head.

Will a 2014 and later head work on the 2011-2013 engines?

Should I source a pair of 2014 & later heads if I need to replace the heads?

Still have fingers crossed when I get to see it in person that it is something simple like a coil pack. However, I am planning for the worst to see if it is worth the cost of the repair.

You have been awesome help.

Ironically Rockauto is sold out of the left head but has 2 different suppliers for the right. I guess people don't believe in doing both heads these days?

You would think the post '13's were better but unfortunately a bunch of our post '13 fleet ones developed a tick anyway. Too bad because it's a silky smooth and powerful six.

Silly to just do the one head, I agree. A friend with a Jeep had the left side ticking and the dealership replaced both at no cost! I was surprised.

The lifters aren't the issue. It's rocker arms. The wheel/bearing/axle wears allowing the roller wheel to drop down. Then the truss portion of the rocker ends up rubbing on the cam and actuating the valves. If the valve train is quiet it's not a rocker/cam issue causing the miss. Most likely a coil or injector.
Doug

Had that "lifter tick" on the other half's '15 Wrangler. Gambled and only replaced the one rocker that showed wear...silky smooth and quiet for the past 30k+ miles.

Obviously if it’s never had plugs that’s the time to do it, but it would have also been logical to swap a coil pack with another cylinder to see if the miss moves (of course inspecting the lower boot section for blow through arcing). After that step next is to ohm out and swap injector with another cylinder. If your miss stays at #2 and you know you have spark, and the injector has pulse (noid light) then it’s time to get mechanical. Of course you might get there and hear “TICK TICK TICK” and know what you’re in for.

….and yes, you need an oil psi switch.