Cm871 RPM shut off

[tree98]

(Yesterday )3406E Wrote:  Finally got a code saying
VGT- Mechanical system not responding or out of adjustment
SPN:2633

That code won't cause it to shut down unless its choking the engine off completely. Monitor the turbo position with insite and see if that's what is happening.

There's a very high likelihood that the ECM is going bad. Start it and while its running give it a good smack with a screwdriver handle right on top of the ECM. If it dies you need an ECM.