VTM-4 warning light comes on. Is there alternate fix besides replace computer?

Thanks Ziptie, yes the MIL light is also on (code for an oxygen sensor). Because the system works if I engage the VTM-4 lock and disengage it before I do any driving I too questioned the idea of some sort of switch or sensor gone bad, but that notion seems to fall on deaf ears at my dealership. I will check with another independent tech/mechanic. Jimc1

Have MIL cause fixed , then have A/T scanned for DTCs. What drivability symptoms are present?

ZipTie, sorry so slow to give feedback. Had O2 sensor replaced and all issues disappeared. PCM is fine. Fortunately my service tech would have replaced a functioning PCM for $1300 if I had not gotten your advice first. Thanks. Jim