I get code p0700 after an OBDII scan.

DTC P0700: Transmission Control Module (TCM) Requested MIL Illumination
DTC P0700 can not be cleared from the ECM until the related TCM codes have been cleared.

The transmission control module (TCM) uses the (GMLAN) to signal the engine control module (ECM) that the TCM is requesting malfunction indicator lamp (MIL) illumination. This happens when the TCM has determined that a failure affecting emissions has occurred in transmission control system. When the ECM receives the a message from the TCM, DTC P0700 will set.
You don't say which engine your's has ! Or which transmission .
Automatic Transmission - 4L60-E/4L65-E/4L70-E

You need to have TCM checked for codes .

Automatic Transmission Control System Malfunction. Could be a connection/wiring issue or bad TCM/PCM module .

p0700 is a transmission overall problem -tcm transmission control module problem u need to have the truck hook up to a diagnostic reader for the transmission -first check the fluid make sure full and not burnt[may need to change fluid and filter other than that their are to many problems that can cause the code

Is this P0605 and P0700? If so read on.
P0605 - Control Module Fault
Possible causes- ECM/PCM Harness power supply circuit is open or shorted
- ECM/PCM Harness ground supply circuit is open or shorted
- ECM/PCM may be faulty
P0700 CHRYSLER - Transaxle Control System (TCM) Malfunction
Possible causes- Shorted or open circuit within transmission control module (TCM)
- Failure of transaxle control module
Tech notes Since the P0700 is just and informative code, check the TCM for more codes to resolve the problem

P0700 means that the TCM (transmission control module) has detected a fault in the electronic control system of the transmission and has requested the PCM (powertrain control module) to turn on the check engine light to alert u to the fact that the transmission has malfunctioned, u must now get the the TCM tested to see what particular fault code(s) u have, these codes can't be read with a generic ODB2 scanner or code reader, u need a dealer to test the TCM, the OBD2 code reader can't do that.