Chrysler Repair: 00 Cirrus:checksum error fault code (P0601), controller module, verification test

Question
Hello,
I have a question regarding my wife's 4 cyl. 2000 cirrus. The check engine light is on, so I took it to auto zone for a free scan and thier scanner read " internal control module check sun error". the car is running a little rough, and may be somewhat down on power, but not dramatically. I have no idea, what it may be and would appreciate any guidance on the matter. Thanks, Eric

Answer
Hello Eric,
I have a 2001 powertrain manual for LH body vehicles which list a code P0601 with the description " Internal checksum for software failed, does not match calculated value". This sounds almost identical to what Autozone reported to you. The title of the code is "PCM (powertrain controller module) internal contoller failure". Unfortunately the repair listed is to "Replace and program the PCM in accordance with Service Information" Then "Perform Powertrain verification test VER-1" That test is fairly straight forward but the VIN and mileage have to be programmed into the replacement unit, otherwise a trouble code is set in ABS module (if equipped) airbag module, and SKIM (sentry key immobilizer, if equipped). All you do after that is start the vehicle and verify that there are no trouble codes noted. So it would seem you could get a controller off a used 2000 Cirrus with the same engine and transmission and just have to pay to update the VIN and mileage reading to reflect your present reading using the Chrysler Diagnostic Readout Box. The alternative is to buy a new one at the dealer and either plug it in yourself or pay them to plug it in (which is not complicated). Then just pay to have the VIN and mileage programmed in.
That is what I would conclude based upon the Autozone readout.
Roland