Sweeping dirt under the rug, doesnt make it go away.
I've dealt with the 601 code on a few occasions, I remember fixing one; but the majority required a PCM. The code doesn't just go away, and being what it is, you won't simply erase it; because, it's an internal EPROM error. What your dealer failed to tell you (and many won't), there are a number of aftermarket service providers still making them, and some parts stores, have the ability to send them out for service. I dealt with one such place here, in Wisconsin - Weaver Auto Parts. They have been bought out by some big conglomerate (Auto Value, I think), now; but I think they can still send those out for repair, and the repair was maybe a couple hundred bucks. We used that service a few times, for some older Grand Cherokees, that the PCM's were unavailable for, at the time.
