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Re: 02 Jeep Cherokee had bad replaced, now has SES light on
Posted to Technical Discussion Forum on 10/12/2007

A P0601 is a "check sum" error (internal programming) in the PCM. If that DTC is genuine, you'll need to replace the PCM and load the VIN. Don't try a used unit or you may have to replace the BCM also.

I have seen bogus DTCs reported on these. You might wann... Login to read more.