Unfortunately you need to talk to the ETC or ESM not OBDII. That would be the trans control module or the shift module. Both store codes and give actual value data to confirm. The only code you will get in OBDII is a P07xx telling you there is trouble in the trans controller. It will not be specific other than that which actually is very specific as it tells you where to check.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician