So I was getting the error code for the Crank Position Sensor and intermittent tach dropping, so I decided to replace the sensor. PAIN in the on mine. Took a few hours to get it out. Replaced with the new one and fired the truck up.

I now have a very noticable vibration in the truck. The tach seems to jump a half notch noticably too. Not sure what happened or if it is related. Any ideas?

Replaced with Cummins 4921601 sensor.....
Thanks...

1999 Dodge Ram 2500 Cummins

 

Was the old sensor chewed up? If so, the tone ring is most likely loose and will be need further repair.

Dave

 

No, the old sensor was fine at the end of it. I put my finger in the hole and felt the ring and it was tight....