I thought I would post (what I'm hoping is) a final update to the 50-56 error code. During the last series of storms the intermittent problem with the TC refusing to allow the transmission to engage was increasing in frequency. At one point the Driver of that unit radioed that it had quit on him 5 times in one driveway. It was no longer functioning properly even at operating temps, which had proven to temporarily solve the issue in previous storms.
Out of desperation I finally loaded the unit on a trailer and hauled it the two hours to the dealer. I arrived just before closing and the TC would not allow me to move it off the trailer. It took approximately 20 attempts (shutting off and restarting) to even back the TC off the trailer. I felt bad because the employees were waiting to go home and had to wait for me.
In the morning the Service Manager drove the TC around and could not get it to fail again! Finally, on the following day the Service Manager called and said he got it to fail and that the first thing they found when the laptop was hooked up was the diagnostics could not find the CPU! It appears that the problem intermittently resides in the Console CPU. The Service Manager ordered a new Console CPU and was told that they are on back order. Somehow, he found one and with overnight shipping, it arrived today! They are installing the new CPU and reprogramming it. They want to keep the TC an additional day to see if that is the only problem. I'm keeping my fingers crossed! Another storm due in on Sunday night! If there are any additional issues I will post them. Thank you to everyone that responded! I have tried to post all of the symptoms. I'm hoping that by posting all this it will save someone else all the time and frustration.
