On your early Hemi, the TCM is an integral part of the PCM and you won't be able to use the early PCM/TCM with the later VVT engine. --Definitely a custom header back exhaust system will be needed or, if you use the stock 392 exhaust logs, just a custom cat. back that mates to the manifolds. --You'll need to have the COMPLETE later model engine I changed the valve body, and the errors still came up --- then knew it was the pcm. Changed the pcm, and no more problems. If it is the pcm, you can get one as a plug n play (already coded) from 2005 Jeep Grand Cherokee PCM ECM ECU Engine Computer for less than $200. Another thing to check is the black connector from the accelerator cable The 6.4 HEMI engine was first made available in the 2011 Dodge Challenger SRT but would quickly become an option for the Dodge Charger, Chrysler 300, and the Jeep Grand Cherokee. While larger and more powerful, the design of the 6.4 HEMI also focused on improving fuel efficiency and enhanced towing force. misfiring on my 5.7 hemi I have this same problem, my 06 charger with a 5.7 hemi has 64K miles on it. It has been - Jeep 2005 Grand Cherokee question If you own a Chrysler vehicle with a 5.7 Hemi engine, you may have experienced an oil leak on the driver’s side of the engine. This is a common problem with these vehicles, and it can be caused by several different things. One possible cause of an oil leak on the driver’s side of a 5.7 Hemi engine is a faulty oil pressure sensor. Re: Wk/Wh 2005~ Grand Cherokee Common Faults And Issues. Marlin said: Updated with; 5.7. - 05-07 models have delay issues with electronic throttle. Dealer rplaced MAP sensor on inlet manifold and installed updated throttle pedal (requires wiring modifications as it's a new design). Can report it is much better now. 2012 Grand Cherokee Tran problems. Just picked up a 2012 Grand cherokee Limited auto with 5.7 Hemi. All was well first week I had it, then one day driving down the road after leaving my house I noted that it was in 4th gear. After multiple attempts of getting it in drive (neutral to drive, park to drive, shutting off and restarting) Jeep still jeepgcoman. Yes, there are problems with the valve seats (mostly intakes), primarily on the early 5.7's. I have two of them..05 Hemi LX and 06 Hemi WK and, after reading soooo many of the horror stories (from $5000-10000 for new engines/installation), I decided to be proactive and change the seats (and other stuff since the heads were off Status of the 5.7 & 6.4 Hemi Valve Train Defect Class Action Litigation. This is an active class action lawsuit. This suit has been brought on behalf of the Plaintiffs and a class of current and former Chrysler, Dodge, Jeep and RAM vehicle owners. Petro et al. v. FCA US LLC, case number 1:22-cv-00621, was filed in the United States District My 2017 Jeep Grand Cherokee needs to have the head gasket replaced and water pump. It is under 60,000 miles (59,400) but 5 1/2 years old. Jeep is not honoring the warrantee since it is over 5 years old. This is a very expensive repair. Any thoughts or advice? Is this common problem with Jeeps? Should I get rid of car? I’m wondering if more problems will appear. Jzl9lF.