TCM commands MIL on after OIS testing

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TCM commands MIL on after OIS testing

smog frogposter
2006 Chevrolet Cobalt LT 2.2L. OIS experienced communications failure with the vehicle, verified it wasn't the vehicle by installing a scantool and successfully communicated. Noticed the MIL lamp illuminated after OIS attempted to establish communication with P0700. Normally I wouldn't worry about this issue since it has happened many a times with GM products before and the Referee would take care of it but this time the vehicle had erratic and hard shifting with the engine intermittently stalling as if the TCC was being applied at idle. Has anyone else ever experienced something like this before? Informed the customer to return if she had any drivability problems...

Edit:
Forgot to add that all OIS prompts were followed and the vehicle was off before installing DAD unit to DLC and performed the KOEO test after installing DAD. MIL was off up until OIS prompted communications failure.