What does the code P0014 mean on a 2002 trail blazer?

" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)

symptoms
Hard starts
poor idle
stalling

cause
wrong camshaft timing
Wiring issues (harness/wiring) in intake timing control valve control solenoid system
Steady oil flow to VCT piston chamber
Faulty timing valve control solenoid (stuck open)

The fix
Replace the VCT unit or one of its components

P0014

Camshaft position sensor, timing over advanced.

I have read some bulletins regarding Camshaft position issues with these vehicles, much of it revolves around a PCM operating on outdated software, an update to the PCM may cure it all, otherwise the Cam position sensor will probably need to be replaced as it is reporting it's position incorrectly. The fact that it is not malfunctioning completely leads me to this. In my experience the CPS either works or it doesn't.

Also check to be sure all the wiring going to the sensor is clean and tight.

My first approach would be the PCM update, this may be covered under warranty so check with the dealer, that way you know none of the codes are " phantoms" caused by the car's computer and not an actual malfunction