What causes oil consumption, whistle or lean codes (1.4t pcv valve cover) on a 2013-2019 Buick Encore?

1. Failed PCV diaphragm in valve cover 2. Intake manifold check valve

2013–2019 Buick Encore: Oil consumption, whistle or lean codes (1.4T PCV valve cover)

Likely causes, ranked

Failed PCV diaphragm in valve coverDIY
Intake manifold check valveShop

Real-owner fix counts will appear here as reports come in.

DIY or shop: See DIY or shop section

Parts to check

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Symptom: Oil level dropping, blue smoke, a whistle, or lean or vacuum leak codes.

Likely causes

PCV. Buick Forums owners report oil loss from a failed PCV part built into the valve cover. The fix is a new cover, and sometimes the intake manifold.

DIY or shop?

DIY for the cover; Shop otherwise.

Useful steps

Check oil often.
Listen for a whistle near the valve cover.
Read codes.

Vehicle focus: 2013–2019 Buick Encore.

Safety / mechanic note

None

Related trouble codes

P0171 System Too Lean Bank 1
P0106 Manufacturer-specific or not yet in our code library

Recalls & service bulletins

Technical service bulletins

GM PI (1.4T PCV) 2018 GM procedure: replace the cam cover if it leaks oil or vacuum at its port, and check the intake manifold check valve. Details

NHTSA complaints: 38 keyword-matched complaints for Buick ENCORE 2013–2019 (of 566 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-15).

Always check your VIN for open recalls at nhtsa.gov/recalls.

Sources

What actually fixed it?

Had this problem? Tell other owners what the real fix was. Reports are counted above; we never show made-up numbers.