SES light, no DTC shown

[Blue02WS6]

I have a 02 Chevy Avalanche, 5.3 and have had it for a month or so, the first week I had the SES light on and the readers at the parts store have shown the evap system, front wheel speed sensor and maf, (I unplugged the maf and cleaned with maf cleaner) I cleaned the speed sensor, replaced the evap valve assembly and there was no light for about a week, did some light tuning on the maf and ve tables and now I am getting the SES light back on but there is no code showing per the scanner, it will let me clear it and the light goes off but is back on in a day or so, any ideas what is going on?

[Keith@HPTuners]

I'll try to work in some more DTC readers for tomorrows 3.0

[Blue02WS6]

If it matters I am using ver 2.24.108

[Keith@HPTuners]

.... lol... *sigh*

that version is maybe 4 years old

[Blue02WS6]

.... lol... *sigh*

that version is maybe 4 years old

I will update...normally I use the last version instead of a new version as the previous usually has the bugs worked out...

[Keith@HPTuners]

The older the version, the more bugs there are.

[Blue02WS6]

Thanks, I updated, the code is evap system, I already replaced the purge canister valve (as a parts store code reader said that was the most common fix, apparently that is not the problem.

[Keith@HPTuners]

DTC's should work properly in tomorrows 3.0