I've got a 2002 5.3 harness and computer that I am reworking. I'm bench checking everything and with this unit I keep getting this same error while trying to read it. It fails at 3% everytime.
"VCM read failed at loc: 4000 error: checksum"
I've tested my bench setup on my personal harness and computer and I can read it evertime. The problem computer is from a wrecking yard, out of a 2002 suburban, don't think anyone has done any programming on it.
Any ideas? Thanks in advance.