5.0 Cylinder Deactivation

[Hockeymandan13]

Also cylinder deactivation is not active in sport and tow haul drive modes. A tune can also make it so that it does not activate in normal or eco drive modes.

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[v8440]

I can't tell when mine deactivates cylinders, so I guess it's not a problem for me. I'll take improved mileage anytime I can get it.

 

[Hockeymandan13]

I can't tell when mine deactivates cylinders, so I guess it's not a problem for me. I'll take improved mileage anytime I can get it.

I only noticed it once I added an exhaust system. It's very noticeable and quite annoying as a result.

 

[MJG44]

Yes, aftermarket exhaust made the CD super obnoxious. Tuned out the CD along with other things that come with a tune.

 

[Stealth88]

I have a Corsa sport side exit exhaust and hearing the CD activating/deactivating isn’t really that big of a deal to me.

 

[Ranger621]

It’s that late 60s easy listening that helps

You noticed that...yes it help, smooth and easy....LOL

 

[Henfield]

Did you measure based on fill-up vs odometer, or based on the dash computer? I also have 21 with 5.0, I do a lot of drives similar to the distances you mentioned and never went above 21.
Don't get me wrong - I am not complaining. I did not buy 5.0 expecting a Toyota Prius MPG, just saying that I never saw 24-25. Granted - I go by the computer.

I track every mile using the Fuelly app. I can comfortably live with 22 on the highway on summer fuel. Winter fuel will give you less. Summer towing 12-13 but winter 11-12. Everyday usage frequently includes short trips which kill mpg in any car. 18-20mpg.

 

[TopOMichXL]

I can’t tell when it activates. What does it feel/sound like?
2024 RCSB, 5500 miles so far. 18.3 mpg average.
2019 RCSB 2.7 3.73’s. Traded it for the 2024. 71,000 miles 20.6 mpg. If anyone is interested.

 

[v8440]

Ya'll ain't gonna believe this shit. JUST NOW, my truck started misfiring, dropped a cylinder completely under load at least. Has one code pending, P3402. I found this on the internet:

Cylinder 1 Deactivation/Intake Valve Control Circuit Performance

So, I may have the board's first 5.0 cylinder deactivation problem. That said, it may well be something not plugged quite all the way in. I doubt it's anything very serious. I will be getting it to the dealer soon though.

 

[JExpedition07]

Ya'll ain't gonna believe this shit. JUST NOW, my truck started misfiring, dropped a cylinder completely under load at least. Has one code pending, P3402. I found this on the internet:

Cylinder 1 Deactivation/Intake Valve Control Circuit Performance

So, I may have the board's first 5.0 cylinder deactivation problem. That said, it may well be something not plugged quite all the way in. I doubt it's anything very serious. I will be getting it to the dealer soon though.

On a positive note, even if cylinder 1’s VDE solenoid or roller rocker were to be acting up, it’s right under the valve cover and not a very invasive diagnosis or repair. Look forward to an update though.

I have seen 1 or 2 battery/ground issues on the boards throw this code, so your dealer may be chasing a short to ground or failed ground somewhere else. Good luck and hopefully you get a speedy fix.

 

[v8440]

I drove it some more today and it did not misfire. I think that if it does not do it again before the appointment that I will cancel the appointment. I think the chance of them fixing it with no hard code stored and no symptoms is low, and the round trip to/from that dealer is 50 miles. I will certainly keep the board apprised of what happens.

 

[NavyChief]

Didn’t you just buy that truck?hopefully it was just a glitch in the matrix

 

[v8440]

Yes I did, to replace my still-getting-lemon-lawed 2025 ram laramie. Today there has been no sign of any trouble with the truck. Like you said, maybe just a glitch.

 

[v8440]

The truck has not misfired since the other day. At this point I'm going to cancel my service dept appointment for tomorrow as no hard code was ever set. Without a code and lacking any current symptoms, I can't imagine the technician would be able to pinpoint what happened. Hopefully it will not happen again; if it does, I'll make another appointment once a hard code is set for them to read.

 

[v8440]

I've still not experienced any more misfires, just as an update.

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