The product manager at my job is completely non-technical, and this seems to have been by design (they just filled it from an internal candidate a couple months ago), basically she is supposed to be the bridge between engineering and the "stakeholders", so to speak and make sure their vision matches what is happening. To handle the technical side of things we have another manager that does have a technical background, loosely termed the "project architect". All technical decision go through him or the CTO, the fluff stuff and touchy feel stuff goes through the product manager.