Ram 5.7L HEMI V8
5.7L HEMI MDS cylinder deactivation diagnosis
Multi-Displacement System faults on the 5.7L HEMI.
Why this matters on the Ram 5.7L HEMI V8
MDS deactivates four cylinders at light load using special lifters and solenoids. Solenoid and lifter faults are common.
Symptoms owners notice
- MDS-related codes
- Tick
- Rough running at cruise
What we check
- MDS solenoid tests
- Oil pressure
- Lifter inspection
Repair work involved
- Solenoid and lifter repair to factory configuration