TBI woes

[Just call me Sean]

Originally Posted by 66gmcguy

I'm not sure if that's the case. I only think this because the computer retains fault codes even after shutting the truck off for a while and the codes only go away after disconnecting the battery for a minute or so.

The computer should retain the codes but it won't if you don't have constant power to it. So it gets power to run but shutting it off removes the only power it gets, pretty much like disconnecting the battery. You said the light comes on but no codes stored.