need help checksum error $ff06: 2004 yukon 5.3
unhooked the aftermarket radio was the first thing i did also pulled all fuses that are not needed tryed to cal flash went trough until the last sec then the checksum failure $06ff: pop's up so i checked for any extra modules looked at the radio harness dont see any problems this it the first truck i have ever had a problem like this with i have tried to full flash it and cal flash it a bunch of times with the stock read file and wrote filed all of the do the same thing the ecm i think some how to droped a file because doing a obd read it has no info in the ecm is there a way for me to recover it or do i just have to buy the costumer a new or remain computer need help thanks in advance
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