Tach stops-engine keeps running

[jeself]

I was driving in heavy traffic and all of a sudden my truck (1999 Dodge 2500 Quad Cab 4x4 Long Bed w/ Cummins Turbo Diesel) just shut off! I lost all brakes and power steering and coasted to a stop in the middle of three lanes of traffic doing approximately 45-50 mph. I hit the flashers and put the truck in park. My check engine light came on and it restarted immediately. About five minutes later, while trying to limp home, the tachometer suddenly dropped to zero but the truck kept running and a few seconds later the tach started working again. I made it home and later that afternoon started the truck to go to Autozone and have the fault codes read and everything was fine. No check engine light, tach was fine, and no stalling. This morning on the way into work..the tachometer suddenly dropped to zero, the truck kept running, the check engine light came on, and a few seconds later the tach started working again.

[fredjacksonsan]

Sounds like some electronic bug. What did the codes at Autozone show?

[jeself]

Never made it to Autozone. I went to Dieseltruckresourse.com and found four post with the same problem as mine, as well as detailed instructions with pictures, on how to fix it. It was the crankshaft position sensor.

[fredjacksonsan]

Awesome....running good now I'm sure.