I have an 06 Ram QC 4wd 5.7L Hemi.
Two days ago I was driving home from town and was under steady acceleration and the truck made a couple popping sounds from the engine. It sounded like it came from the right side of the engine bay. Pulled over, checked under the hood, found nothing out of the ordinary. Oil pressure was normal. About an hour later, on the highway, it suddenly went into limp mode and the lightning bolt light came on (no cel). No pedal response. Pulled over, shut it off and did the 'key trick' to see if it threw any codes, none. Started right up and drove perfectly like nothing ever happened. Yesterday drove into town, no problems whatsoever. Today, going into work, heard a ding sound, looked down and my CEL was lit up. Pulled over, "key tricked" it and came up with these codes. P3497, P2072, P2100.
I searched for their meaning but to no avail. Would anyone know what these codes mean? I appreciate any help I could get, thanks.

 

P3497 MDS Rationality - Bank 2
Possible CausesSetting Conditions
Insufficient oil pressure acting on the lifter locking pins
Oil passages are restricted
Valve lifter has failed
MDS solenoid connector is damaged (check pins for damage, and moisture)
MDS solenoid has failed
Engine running; then during the transition from 4-8 Cylinder mode, the PCM detected the O2 sensor readings on Bank 2 indicated a lean condition while in 4-Cylinder mode. Once all criteria are met, power is supplied to the Multi-Displacement Solenoid (MDS) solenoid while the engine is making a transition from 8-Cylinder mode to 4-Cylinder mode. By actuating the solenoid, oil pressure is raised to the pair of lifters that coincide with each particular solenoid. The oil pressure pushes in the locking pins which allow the lifter to collapse, decoupling the valves and camshaft.

This code sets in 1 Trip(s).
This code will turn on the MIL (Malfunction Indicator Lamp)

I believe 2072 has to do with throttle actuator.
2100 - electronic throttle control circuit.

 

Thank you kenneymc, I appreciate the info.

 

What oil was used on your last (or last few) oil changes?

 

Yeah, I'm thinking the MDS system is the primary culprit here. Since it is effected by oil, hemilonestar may be on to something.

 

Valvoline synthetic blend 5w20. I am about 300 miles overdue for the next oil change will happen this weekend.

 

Right oil, maybe it was just a failure.