I have noticed on my 2019 300C 5.7 Hemi, it seems like the torque converter has a slight vibration at times. A few days ago I left my dash mode in the fuel mode that shows MPG and other things. As I am driving in lower speeds in town, I noticed the 4CYL light comes on. I was able to put the two together. When ever the 4cyl light came on, the car vibrated slightly till I give it just a very small amount of gas and then it goes away as it seems to down shift ,and then its completely smooth and quiet. My question is can this be adjusted to possibly a higher highway speed so I don't have to listen and feel this annoyance. I seem to think it should be for the higher speed any way. (over 55 mph highway when it should go to 4 Cyl. to save gas). I wonder if it can be adjusted or turned off. Its a big annoyance to me to have to keep adjusting the gas pedal to force to car to be smooth running. Comments..........Thanks Guys

 

I am not familiar with this technology but here is what the service manual says:
SOLENOID-MDS
DESCRIPTION
The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy. It has two
modes of operation :
a. 8 cylinders for acceleraton and heavy loads.
b. 4 cylinders for cruising and city traffic.
The main components of the Multi Displacement System are :
a. Unique MDS camshaft.
b. Deactivating roller tappets.
c. 4 control valves/solenoids.
d. control valve/solenoid wiring harness.
e. oil temp sensor.
OPERATION
Cylinder Deactivation
a.Trap an exhaust charge
b.Normal combustion event
c. Don’t open exhaust valve
d. Don’t open intake valve
e. Piston is an air spring
f. Cylinders deactivated in firing sequence
Cylinder Reactivation
a. Empty the cylinder
b. Open exhaust valve
c. Open intake valve
d. Normal combustion event
e. Cylinders reactivated in firing sequence
DIAGNOSIS AND TESTING
The Multi Displacement System has the following detectible issues:
a. Solenoid circuit
b. Fail to deactivate a cylinder(s)
c. Fail to reactivate a cylinder(s)
d. Low oil pressure
CONDITION POSSIBLE CAUSES - CORRECTION
MDS does not activate
1. Low oil pressure - Check for proper oil pressure
2. Bad oil temp sensor - Replace oil temp sensor
3. Malfunctioning MDS Solenoid - Replace Solenoid
4. Malfunctioning MDS Tappet - Replace Tappet
MDS Does Not Deactivate:
1. Low oil pressure - Check for proper oil pressure
2. Bad oil temp sensor - Replace oil temp sensor
3. Malfunctioning MDS Solenoid - Replace Solenoid
4. Malfunctioning MDS Tappet - Replace Tappet
REMOVAL
1. Disconnect the negative battery cable.
2. Remove the intake manifold.

COMMENT: Inspect wiring harness and connectors for damage

3. Remove wiring harness connectors from the MDS solenoids.
4. Remove hold down bolt from MDS solenoid.
5. Remove MDS solenoid.

INSTALLATION
1. Install MDS solenoid fully into block.
2. Install hold down bolt and torque to
3. Reconnect the MDS wiring harness to the solenoids.
4. Install the intake manifold.