the engine lite glows for about 2 days then goes back out then on ? on 2006 Chevrolet HHR

It also when i floor the gas peddle the turbo starts to kick-in b
ut it don't and i was watching and the engine lite started to flicker as soon as i let off the gas peddle it went out? When the engine lite came on i called on star they came up with a code that the cam timing sensor problem. Can you tell me alittle bit about this please?

Asked by for the 2006 Chevrolet HHR
Need a little more info. Engine size and specificaly what code OnStar gave you.