Have 2006 Chevrolet Cobalt and car shut off and engine derated on the highway. The car will crank but does not start. Has fuel and pressure in the fuel rail. Had codes scanned and was p0068.
P0068 Throttle body airflow perfromance
This code just could be the reslt of the engine stalling rather than the problem. P0068 will surely put the engine in a limp home mode. Even with this code the engine should start up, it be in a limp mode but it would start.
Checking to see if the engine at least has spark would be a good start and also the fuel pressure. should be at 50 - 60 psi with the key on engine off. The use of a scan tool with live data can be used to see if there is at least igntion being initaited, with the scan tool during cranking the RPM should be above 250 RPM less than this there would be no igntion. This year make and model had a Recall for the igntion switch , suspect that area.
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