2011 GMC Sierra 2500 hd P0325 code

[chris12385]

I just bought a 2011 Sierra 2500 6.0, did have  p0056 and p0325. But I got the p0056 to go away, replaced the knock sensor. Cleared code for p0325, but it came right back on. Truck has 91450 miles, any ideas on what the issue might be?

[CamGTP]

If that code comes back as soon as you clear it, it's a wiring problem just like the code suggests it is. 

 

Inspect the whole wire harness for that sensor, look for damage.