I bought a 2007 combo with 25k around 6 months ago have had it serviced and has run like a dream until yesterday, the revs shot up and smoke was pouring out the exhaust i pulled over and removed the ignition key but the engine carried on revving like crazy with loads of smoke for around 2 minutes and then stopped.
You should have stalled the engine immediately your discovered it wouldn't stop by turning off the ignition. The engine was running off it's own lubricating oil, totally indepenend of ECU, injectors, whatever.
If it stopped after two minutes, the engine is almost certainly a boat anchor now.
Oddly, older GM designed engines had a failsafe that killed runaway diesel engines by blocking the air intake with a butterfly flap. The rubbish Fiat engines they're using now don't have this feature, so can easily runaway when (not if) the engine starts eating it's own oil.
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