Cadillac Repair: computer codes, mass air flow sensor, mass air flow

Question
Can someone please tell me what these codes mean? I have a 2000 DeVille, vin# 1G6KD54YU221905. Here are the codes:

IPM B0429
PCM P0420
IPC U4016 History
PCM P0101 History
RIM C0658 History

If anyone can help I will be your new bestfriend!!!!

Answer
B0429 = Temp control #3 rear circuit range performance in the heater and AC system.

P0420 = possible restriction in the catalytic converter.

U4016 = No such code.

P0101 = mass air flow sensor fault.

C0658 =  level control compressor relay problem in the suspension system.