5.7 hemi problems

Gen III 5.7 Hemi & 6.4 Hemi Valve Train Problems Leads to Class Action Lawsuit. Here’s What You Need to Know

If you own a Gen III 5.7 or 6.4 Hemi powered car and are experiencing valve train problems, don’t worry, you’re not alone. A new class action lawsuit against Fiat Chrysler Automobiles (FCA) has been announced. The suit alleges that the valve train on the Gen III 5.7-liter HEMI or 6.4-liter HEMI 392 V-8 engine is prone to failure. Additionally, the suit alleges that FCA have known about the problem for some time but failed to take action.

If you’re impacted by this defect, what can you do? Read on for more information.

Owners Allege Valve Train Defect Causes Premature Engine Wear

According to the complaint, the alleged Hemi valve train defect can cause premature internal wear to the engine. This can create bigger problems down the road and shorten the lifespan of the engine. In fact, the suit claims when the valve train prematurely fails, the entire valve train needs to be replaced including the camshafts.

The suit alleges owners and lessees are often forced to pay out-of-pocket for repairs when not covered under warranty. Making matters worst, the replacement parts contain the same defects and could potentially fail while the vehicle is outside of the warranty period.

Additionally, the class action states “Despite access to aggregate internal data, FCA has actively concealed the existence of the Valve Train Defect by claiming that consumers are responsible for the failures, even when consumers follow FCA’s published maintenance schedules.”

Multi-Displacement System to Blame for Defective Valve Train?

FCA’s proprietary valve train technology, Multi-Displacement System (MDS) is a system designed to improve overall fuel consumption. It works through a combination of software and hardware to deactivate four of the engine’s eight cylinders at a certain engine RPM and cruising gear.

MDS utilizes specially designed lifters and solenoids combined with pressurized engine oil to activate or deactivate plungers inside the four collapsible lifters. The vehicle’s PCM is responsible for controlling this process as soon as the drivers foot is off the throttle, or maintaining steady speeds at low loads or minimal throttle. This system helps the vehicle consume less fuel overall.

Hemi MDS activation and deactivation of clinder order
MDS system activation and deactivation order of the Hemi cylinders

However, the suit claims the MDS system is defective and malfunctions. As a result, the defect causes damage to the lifters, camshafts, and valve train components. This damage requires replacement of the valve train components, including the camshafts.

Even worst, metal debris from the failing valve train can circulate throughout the engine, potentially causing total engine failure.

Defective Hemi Valve Train Causes Loss of Power While Driving

The suit claims the HEMI valve train problem may pose a serious safety concern to the vehicle occupants and other drivers on the road. Owners have complained of losing power while driving, as well as experiencing hesitation, surging and stalling. These issues have caused many problems for drivers, who report feeling unsafe while on the road.

What Are the Common Symptoms of the Hemi Valve Train Defect?

A common symptom of a failing Hemi valve train is a loud ticking noise coming from the engine when fully warmed up. If you notice this sound, it may be an indication that the valve train suffers from this defect.

Other common symptoms include: loss of power while driving, especially at highway speeds, or while trying to merge or change lanes, hesitation, surging, and stalling.

Is There A Fix For The 5.7 & 6.4 Hemi Problems?

Currently, there is no known fix available for the Hemi valve train issue. The suit claims the MDS system, which utilizes a combination of hardware and software is the likely culprit. Additionally, the suit alleges premature engine failure is possible due to design defects, materials and even workmanship of the valve train system. Therefore, replacing the defective part or engine does not resolve the problem, as the owner will be given another defective part.

FCA Vehicles Affected

The following Chrysler, Dodge, Jeep and RAM vehicles are affected by this valve train system defect:

Status of the 5.7 & 6.4 Hemi Valve Train Defect Class Action Litigation

Class Action Currently Active

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 Court for the District of Delaware.

Hemi Valve Train Class Action Lawsuit FAQs

What is the Hemi Tick?

The Hemi tick is a tapping noise that affects many Chrysler, Dodge, Jeep and RAM Hemi motors. This ticking noise can be caused by various problems, such broken or loose exhaust manifold bolts, roller rocker on the camshafts, faulty lifters, and loose spark plugs.

In some cases, the tick may be simply be caused from the vehicle being parked for extended periods of time.

Is the Hemi Tick Bad?

If the vehicle has been parked for long periods without use, then the tick noise upon cold start-up isn’t harmful. However, when the vehicle is up to normal operational temperature and the tick noise continues or even gets louder when driven, then this is a sign something is wrong.

How Common is the Hemi Tick?

Many owners claim the tick noise is common with Hemi Gen III 5.7 and 6.4 Hemi engines, and normal on cold startup. The tick noise typically lasts less than a minute. However, if the tick noise continues longer than a minute, it may be a sign of more serious mechanical problems.

Questions About This Lawsuit?

MyCarVoice.com is not counsel or the settlement administrator in this class action lawsuit. Our goal is to inform owners of these vehicles of the recent lawsuit. This post will be updated when/if new suit information is released.

Please considering subscribing to this post for critical updates.

Have you owned or leased a vehicle manufactured by FCA containing a defective Hemi valve train system? Add your voice to this post in the comments below. 

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Last Updated on June 4, 2022

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  1. Avatar
    KrisJune 11, 2022

    I’m looking to jump on an active Lawsuit

    I had a faulty Lifter & roller that ate my Cam. Shelled out over 3+k to get it fixed. Not to mention a whole month of not having a vehicle.

    So if you have any info please contact me.

    1. Christopher
      ChristopherJune 11, 2022

      Kris we recommend subscribing to this post for news or announcements pertaining to this suit.

    2. Avatar
      LisaJune 20, 2022

      Will let you let me know if you find anything Kris? Just had the engine suddenly stop working on 2010 Jeep Grand Cherokee Limited and founding a ton of problems with the 5.6L HEMI engine. I see a lot of issues in searching, but curious why they are not including the 2010’s with the same engine that has already been recalled by Chrysler for the exact same engine in their Dodge Challengers and a couple others?

  2. Avatar
    Don pressingJune 20, 2022

    2012 same issues cam and lifter replaced and now it Knicks and consumes oil

  3. Avatar
    JonnyJune 22, 2022

    I have 2 trucks 3500 and 2500 the 3500-6.4 hemmi 2020 with 89k start doing the kicking I take it to the dealer and warranty is expire. They want 12k or over to fixed! I still own 28k on it! I may just let f*** my credit and don’t put any more money on it!
    Midland Texas

  4. Avatar
    AaronJune 26, 2022


    Thank you for compiling this information. I recently suffered the same cam/lifter fate on a 2015 Ram with only 80,000 miles. Is there a way that others like myself can support the lawsuit? Its outrageous that a valvetrain can’t even make it to 100k miles!

    1. Christopher
      ChristopherJune 27, 2022

      You’re welcome Aaron. No, nothing you need to do other than save all receipts of work related to the issue.

      1. Avatar
        AaronJuly 6, 2022

        How long does a typical class action lawsuit take to play out? I’m guessing years but I really have no idea.

        1. Christopher
          ChristopherJuly 6, 2022

          Aaron, it really all depends on certain circumstances. But I would say on average, more than a year.

          1. Avatar
            AaronAugust 7, 2022

            Any updates on this class action suit? Or, know of a location where updates are provided?

          2. Christopher
            ChristopherAugust 12, 2022

            Nothing current, but subscribe to this post and will add updates once received.

  5. Avatar
    Bryan smallmanJuly 8, 2022

    2009 dodge ram 1500 5.7l hemi 148,000 miles lifter failure on cylinder #8. Replaced all lifters before hurting the cam, now 15,000 Miles later cylinder #2 lifter failure. What a joke dodge…..

  6. Avatar
    StevenJuly 18, 2022

    Iv owned an paid off my 2012 dodge 1500 hemi .on a 5 year payment plan my truck has just over 100k miles . I parked it trying to figure out the problem. Iv replaced the spark plugs the coil packs iv had it checked out from local shops nomatter what I do.. it has a ticking, knocking like sound. When the rpms are down it bougs out an starts shaking everywhere it says misfire on cylinder 3 when the codes are ran. It is missfiring so bad it shakes. Iv parked it still trying to find out what it is.. bt everything the lawsuit against them says is exactly what is wrong with My truck so they atleasf have to fix it or reimburse my money I’m out this has been ongoing for years now an has gotten to the point I can’t drive it

  7. Avatar
    ToddJuly 20, 2022

    190,000 on my 2014 ram 1500. Just got done replacing the cam, lifters and all associated parts. Ticks more now than before.
    Hoping this lawsuit actually pays out.

  8. Avatar
    Craig RichardsJuly 25, 2022

    My 2020 ram 1500 has only done 35,000 kilometres and the tick has started

  9. Avatar
    Jon WoodsAugust 3, 2022

    2014 ram 1500. Just over 100,000km which is pretty low for an 8 year old truck. “Hemi tick” started very mildly at about 70k only on the passenger side. By now its both sides and there seems to be some minor power loss. Been told since way before warranty was up that its fine and normal. As soon as warranty was up my dealer said I should let them fix the studs….weird. As of yet there has been no catastrophic issues but I feel like its just a waiting game.

  10. Avatar
    GaryAugust 10, 2022

    I have a 2017 dodge challenger same issue I have a lifter tick I bought the car at a certified dealer and only put 200 miles on it now the dealer is avoiding my calls🤬


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