They tried, according to Greg, several times to reflash or reprogram the PCM and retest it but it always (or so he said) went back to the same 0605 error and wouldn't accept or hold the new "flash". Then, when querried about just what the PCM controls, a little light bulb (albeit in my case a somewhat dim one)went off in my mind.The only thing that has me wondering about this chapter in the "My Truck, the Lemon" book, is why this particular code didn't show up before. I'm just wondering if sometimes they just don't code out until the fat lady finally sings(ie it finally goes Kaput!). It just seems that if this really is a "gone South" PCM, and that it had been slowly heading that way for some time, perhaps that would be the reason for the SES light to come on (frequently at times, at others seldom-I think you mentioned before that it also controls fuel pressure)?? What about turbo wastegate. Would seem that if the turbo started dumping air when under a load, ie climbing a grade, but the injectors were being told to "pour it on", based on, say, throttle position sensor, that would give me the flooding problem I seem to get when I lose power. Again I'm a simpleton when it comes to Diesels and turbos and such. Do you know, off hand, if the PCM controls the turbo as well? I've read posts here mentioning something about "overboost". I am assuming that if the PCM controls turbo function as well, if it interpeted a signal from a sensor as turbo pressure being too high, it would instruct the "wastegate" to dump the excess...which would result in way too much fuel and not enough air...hence flooding and loss of power. I don't know the frequency of PCMs going south, but it would seem that with all the little, and not so little, problems I'm having with this truck, to have a lot of sensors, relays, ipr, naacps, fbi's, cia's etc..etc...etc, go wrong all at once, or closely timed, though not entirely impossible, is highly improbable. While having one item, that controls all the others, go bad, would be more probable. According to Greg, a faulty PCM CAN fire off a false P1211 code, but not vice versa, so maybe the PCM is throwing out the false 1211 code when in fact there isn't really a problem with that system at all?
Sorry for all the long winded oratories here, but I'm trying to pick as many knowledgable brains as possible..."to be fore-warned is to be fore-armed". I have a feeling I'll be bankrupt at some point because eventually this thing gonna be fixed (and fixed right) at which time I'll get to jump up, wave my arms wildly and shout "BINGO!!!" (at which time I'll probably owe everyone here Pizza and beer for life)