I'm having a strange starting problem with my 2005 V6, and I'm wondering if anyone has ever seen this before.

The basic symptom is: Turn the key, the truck starts to turn over for maybe a quarter of a second, then stops. Stops trying to turn over, just stops. New battery, fully charged, etc.

I took it to a shop. They found something interesting. If they used their OBD scan tool to command the computer to turn on the start relay, then they could start it no problem. And then the truck runs normally - can drive it, no problems, no codes. But without that "energize start relay" command to the computer, it appears the computer almost instantly shuts down the start.

They're suggesting it's likely a computer problem and I should replace it. Seems plausible to me. Any other thoughts?

Thanks.