P0700 only means there are transmission control module codes to be read with a scanner.
The TCM codes will explain more of the fault information.
The TCM cannot trigger the light, only emmisions related faults can trigger the light. So,.... they program a generic code to tell the PCM that there is a fault.
P0700 is the TCM code for the PCM.
You may have one or many TCM codes to be read.
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