P0601 PCM Internal Ctrller Failure

Internal controller failure. That is a hardware fault, bad cell in the battery won't cause it. Bad alternator won't cause it. So long as that code is present, NOTHING else your computer tells you is believable. You need to replace the PCM.

 

okay. have you heard of death flash before?

 

Yep. There are a couple threads about it in the faq section.

 

well replaced the pcm and it acts complely diffrent rpm was 810 and temp 140f now with the new pcm rpm's are 620 and the temp is 224 but sometimes goes up to 244 when seating in traffic. The p0442 came back and pending code of p0138 high voltage O2 sensor.

 

put in an NGK O2 sensor and no more pending code. still have the other for whatever reason.

 

ya always run NGK, bosch ones dont jive with these trucks

 

yep always ran the NGK O2's. this evap code is getting very frustrated had another smoke test and no leaks found again i just don't know! feel like just sticking a rag in the filler neck lighting and walking away.

 

P0442 Evap Leak Monitor Medium Leak Detected

With a smoke test, this should be obvious. If it isn't, I would wonder if the LDP itself wasn't the problem.

 

Yeah I would of thought to but not. I've already replaced the leak detection pump,gas caps x2,evap seloniod,and checked every soft and hard line myself at least 5 times and no cracks or slips lines found anywhere.

 

Check/Clean the connectors at the PCM. Wonder if you just don't have a slightly dirty connector confusing things.