P0301 Chevrolet -

Question

I have a 2002 Chevrolet Silverado 2500hd 6.0 liter I keep getting random po301 codes I never know when its going to happen because it is so intermittent I have found broken wires and corrected those and also here is a list of what I have changed in this frustrating process.........egr valve,fuel filter,map sensor,maf sensor,intake gasket,pcv valve and hose,new Ngk Spark Pugs,new plug wires,all 8 new coil packs,and yes I switched them to cylinder 1 just to check each coil,#1 cylinder fuel injector new,02 sensors check out good.. AND like I said I never know when its going to misfire because its intermittent...checked and fixed 3 ground wires,did fuel pressure test and engine compression test #1 cylinder which is my fault cylinder had 190psi so that's good and last but not least I replaced the Ecm(computer).This has me stumped any help or suggestions that will lead me in a better direction would be awesome THANK YoU!!!

Answer 1

Hi there,

This code indicates a misfire on cylinder 1. Here is a list of possible causes.

P0301 CHEVROLET - Cylinder 1 Misfire Detected

Read more: https://www.autocodes.com/p0301_chevrolet.html