03 CL throwing a P0219

I have a 03 CL Type S 6mt that has had a CEL on for a while now. I just brought the car up to where I'm living and scanned it finally today and it threw a P0219 Engine Overspeed Condition. I work at a shop and have all the tools but no time for extreme diagnosing. The car was in a front end collision a few years back and did have the engine pulled for the work they did. Any help diagnosing this would be appreciated!

- Tim