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.