July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

DTC P1601: Communication Line Error (Automatic Transmission): Condition

DTC is set when signal voltage from Transmission Control Module (TCM) to Powertrain Control Module (PCM) is too high. Possible causes are:

Open or short circuit between terminal No. 2N on TCM and terminal No. 2H on PCM.
Open or short circuit between terminal No. 2K on TCM and terminal No. 2G on PCM.