PCV Horror Show - 2014 Cadillac ATS 2.0T

[webfors]

163,000kms. Bought used in February 2025 with 138,000kms. Because the 2.0T comes with a fancy plastic engine cover you never get visual inspection of PCV hoses until the engine throws a code. The code in this case was P0171 (lean condition) and P0326/327 (knock). I was shocked to think how long this system was compromised before the code showed up, so I took a look at my 2017 ATS 2.0T, and the main three way hose was compromised already! So the answer is it can be compromised for YEARS before the code shows up. So check under your engine covers folks!

Spent a morning this weekend replacing the three PCV valves and two PCV hoses on my 2014 Cadillac ATS 2.0T.

You'll need fuel line disconnect tools to get the hose off the turbo inlet and off the main 12663027 valve if you aren't replacing it.

Used the following OEM PCV valves:
12663027
12655399
12655400

I used inexpensive aftermarket hoses from Amazon. I found them of high quality with dual o-rings in each connector, along with handy quick disconnects for easy future replacement.

https://www.amazon.ca/dp/B0C9JD543S
https://www.amazon.ca/dp/B0CBPYBBCF

 

[webfors]

More pictures of the hoses I used:

 

[Thermo1223]

This is always the problem with turbocharged engines. The PCV system becomes a complicated mess for emissions, add in heat as well as time and here we are.

 

[JTK]

Glad you got it! Great pics too.

All the later GM turbo/GDI engines are setup like this with the "one time use" plastic PCV hose systems with the tamper proof screws. The LYX 1.5T in my Equinox is basically the same. These GDI turbo'd engines have basically no manifold vacuum, so the turbo inlet is relied upon for much of the PCV system vacuum needs.