SureTrack Community Real Fix: RAM Shutdown Unlocked

Real Fixes from the SureTrack® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-on® diagnostic software version.

Vehicle
2014 RAM 1500 SLT 5.7L Eng VIN T

Title
MDS Cylinder #1 Shutdown at Idle

Complaint
The diagnostic scanner shows MDS #1 shutdown is always active and code P1411 is set.

Cause
The lock pin in the MDS lifter was not locking in and returning the lifter to normal operation, when the lifter was removed it was visible that the pin was not locked in or even visible. After the repair, the PCM removed power to the solenoid on its own. Even though there is nothing in the diagram that I can find, on this particular truck the PCM when detecting a failure to disengage the MDS on a cylinder, will lock that cylinder out electronically to prevent excessive clearance in the valve train.

Correction
Replaced the MDS lifter, allowing oil pressure from the solenoid to push the locking pin in place and free the lifter to collapse and regulate pressure to the valves.


SureTrack® is a powerful value-added feature available with select Snap-on diagnostics tools. It offers an exclusive combination of expert knowledge and detailed parts replacement records, all wrapped in an interactive community.

Want more? Click here for more information on using SureTrack.

Looking for diagnostic tools? Click here to request more information on Snap-on diagnostic tools.

New or Expired SureTrack users: Click here for authorization key instructions.

About the Author

Abagail Lucero

Abagail Lucero is the Product Marketing Manager for ProDemand. She joined the company in 2011 as a member of the SocialCRM shop marketing team and has served in many roles at Mitchell1, lastly as Security and Compliance Supervisor. Abagail holds a Bachelor of Science degree from California University of Pennsylvania.