All hemis in the 1500 built after 2006 have the MDS. The only exceptions to this is the mega cab which is a 2500 chassis and the non-mds HD engine.

 

I have a "T" as well in a 2011 ram 2500HD mage cab?????

 

For stock setups it can be hard to tell when it's on. After an exhaust upgrade it will make itself painfully obvious like ^^ said, if it's not mega cab then it has mds.

 

2008 1500 hemi yes.

 

To be 100% sure check the 8th digit of the vin. If it is D then no MDS. If it is 2 then your truck has MDS.

 

I have the letter "D" as the 8th character in my V.I.N..... I was sooooooo hoping for the number 2:doh:

 

I have a letter "T" as the 8th character... ??

 

Yes, you have MDS.

 

MDS is the function of shutting down 4 cylinders of a 8 cylinder engine
there is no real indication of when it kicks in & out
The only way that i know for sure to see an indication is IF you release the gas pedal just the slightest bit, does the ECO light come on?
The ECO light comes on at other times too, like if your traveling on flat ground or going downhill, it may also be on if your not going up too much of a grade
As far as i know, the ECO light only turns on when the MDS is engaged
MDS does not work if you are in any other gear but your highest, usually that means the Drive position when no torque or very little torque is needed

 

The 8th digit in my vin is a P what does that mean?

 

Mine is a 2020 Laramie, and I have a “T” in the eighth character of the VIN as well.

The “eco” light never comes on, but it didn’t on my 2019 Ram either, until I activated it on the radio screen. I’ll probably just leave it off this time. BTW; it has nothing to do with the MDS being activated or not.

 

If you have a hemi that's not in an HD model; you have a multiple displacement system.

Basically, when there’s not much of a load on the engine, it shuts off four cylinders to conserve fuel. So; you go from a V-8 to a four banger.

It’s easy to tell when my wife’s Charger goes to four cylinder mode because she has an active (fairly loud) exhaust system.

 

How to shot it off

 

My 8th digit is an r. 2013 ram 1500 bighorn. What does that mean?

 

Bought a 2017 Ram Power Wagon. 8th digit in VIN is J... so no MDS I’m guessing? I notice no difference in exhaust sound when ECO lights up but my truck is completely stock.

 

Mine is also a J did you find out no mds?

 

Ram 1500 with 5.7 Hemi since 2006 have MDS... UNLESS it’s the HD. Even if the 8th digit is the number Q. ☠

 

Both my 2nd and 8th are d

 

I have a 2012 ram 2500 5.7 hemi and my 8th digit is a "t" so does that mean I have mds?

 

VIN Number Lookup & Decoder| Official Mopar® Site

Enter VIN here in all CAPS to find out if your vehicle is equipped with MDS.

 

I have checked my there and could not find if my 2010 ram 2500 is equipped with MDS, just says 5.7 hemi VVT engine. Does it mean my hemi does not have MDS

 

MDs can be disabled

 

Disabling MDS affects your oil pressure level to the roller lifters as they are designed differently on MDS cylinders to compensate for valve lash or lack of from non combustion. Apparently the pressure is increased on down time of MDS cylinders increasing splash on the cam. Whether that is a good thing or a bad thing is ???