Failure Conditions
WARNING: This page is about a different car, the 1990 Cadillac Fleetwood and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
Engine RPM too high for vehicle speed. ECM has a 9-place table of speed versus RPM. If RPM exceeds RPM for speed listed in table for 5 seconds, Code E39 will set.