I did at oreilys then went to firestone yesterday and it just threw up egr valve but original codes were
All below c
0222 0223 0221 0300 0305 0306 00321 0327 0359 0374 0379
All below b
0790 2725 0550
All below p
00120 0449 0522 1516 1518 0220
I bought a 2003 tahoe z71 today upon running the obd reader i had 23 codes pop up almost all are 4wd transfer case or such related the light works on buttons and it engages with no issues i can post all the codes if you like.
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