Code p1657 on my 2006 Ford Fusion SEL 3.0L V6

Question

What would make my 06 ford fusion v6 3.0 sel when idling for a few minutes well it varies between roughly 5 to 20 mins the wrench light on the dash to come on and the check engine light also, car will automatically go into limp mode not allowing u to accelerate over about 5 mph. Then u get somewhere to pull over n depending on how long it has actually been in limp mode as to how long u have to let it sit turned off for a few minutes never been over 20mins though, but then u can start it up n all lights are off n no problems at all. ( Unless you have to sit n idle for a period of time). It seems to be getting more frequently the past couple of weeks I've noticed but everytime it happens I plug in my bluebird code reader and it seems to always pull pretty much the same codes everytime which most common ones are p1657, u0101, u0073,p1000, then a time or two it's pulled b1600,b1601, b1318,u1900,b1884,b2290, does anyone have any ideas what might be going on or advice as to where I should begin with trying to get it fixed I am completely lost n have no idea what or where to begin

Answer 1

DTC P1657 indicates TCM Communication link error. Controller area network (CAN) link error detected by PCM. The vehicle should have no engagements, no adaptive or self-learning strategy, limited fuel & spark. Inspect connectors at TCM & PCM for corrosion or damaged pins. Inspect wiring from TCM to PCM for open or short circuits. If OK, suspect possible faulty TCM. Corrosion on the TCM & PCM pins may also explain the intermittent odd behavior and the multiple codes. Other than that, unless the codes are not intermittent, it will be difficult to diagnose.