Yea the factory scanner I used on yours would be the DRBIII as it could do so much when diagnosing Mopars it was great. I don't know if any other scanners will do as much because I always used the Mopar scanners. But you should at least be able to see it any codes are set with any scanner. Since the PCM works your cruise it can set codes for most everything on the cruise circuit other then a vacuum problem to the servo which that don't sound like your problem. Ron