Install a manual gauge and check pressure while cranking. The pressure sensors can fail often too or the wiring to it. Probably not the ecm if it is still talking to you. Please help, or I might have an "accident" with this piece of junk. Any ideas? ,Maybe the ECM is fried, but wouldn't that throw a code for it? Codes flashing are 164-11, IAP system fault (39) and 164-2 Injection Actuation Pressure Erratic (15). Truck shut down during highway trip on sunday, and shop cannot figure out what is wrong. have replaced fuel pumps, check valve on filter housing, IAP sensor(twice). I have an '02 GMC T8500 with a cat 3126, it has run crappy from time to time from when I bought it 9 months ago. Thread Title: CAT 3126 ran badly now will not start, with codes CATEGORY LISTINGS > CATERPILLAR > CAT 3126 ran badly now will not start, with codes
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