2003 Chevrolet Express 2500 Q&A
2003 Chevrolet Express 2500 Question: check engine light
My check engine light would sometimes come on in the winter. This last winter it did not. Now it came on about a week ago. I went to autozone to have them pull the code and the instrument say it must be connected to vehicle. I'm trying to figure out why it won't read the code. - Visitor
I would recommend a proper diagnosis be performed by a qualified technician, not a clueless parts store trying to sell you parts based off of a code pull...that they apparently aren't capable of doing. It's possible you may have a blown data link fuse? In any case, check engine lights can come on for many reasons, and only a true diagnosis can get to the bottom of the problem. - DaveJHM
...the engine replaced in my van two days ago.started to drive home, and after around 25 miles my check engine light started flashing. stopped at autozone and they pluged in their scanner and p0300 came up. drov...
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...tion check valves may become restricted causing poor air flow resulting in illumination of the Check Engine Light. It is often recommend to replace both check valves even if a fault code is set for only one...
...so cole it put frost on the window and this was while it was on vent only, A/C wasnt even on. Check engine light has been coming on/off intermittently.