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2015–2021 Chevrolet Trax: Oil consumption, blue smoke or PCV problems (1.4 turbo)

Likely causes, ranked

  1. Failed PCV diaphragm or valve-cover PCV assemblyDIY
  2. Oil consumption or leaks around the turbo / valve coverShop
  3. Intake manifold non-return valve or related crankcase ventilation partsShop

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: Rising oil use between changes, blue smoke on boost or deceleration, oil around the valve cover, or rough running tied to crankcase ventilation.

Likely causes

  1. PCV / valve cover. TraxForum members with the 1.4 turbo discuss failed PCV diaphragms in the valve cover and oil mess around the cover and intake. Several replace the PCV/valve-cover assembly when the diaphragm tears.
  2. Oil consumption path. GM PIP5197E walks techs through oil-consumption and blue-smoke diagnosis, including PCV checks, before throwing parts at the turbo.
  3. Turbo and leaks. If ventilation is restricted, owners also report oil pushed past seals. Confirm the PCV path before condemning the turbo.

DIY or shop?

PCV/valve-cover work is often DIY with care. Consumption tests and turbo diagnosis are a shop job.

Useful steps

  1. Check the oil level often and note how fast it drops.
  2. Inspect the valve cover PCV diaphragm for tears.
  3. Ask a shop to follow PIP5197E-style checks before replacing a turbo.
  4. Fix any intake or boost leaks found on a smoke test.

Vehicle focus: 2015–2021 Chevrolet Trax.

Safety / mechanic note

Low oil can damage the turbo and engine. Verify with a mechanic if you see blue smoke, knocking, or a rapid oil drop.

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Recalls & service bulletins

Technical service bulletins

  • PIP5197E 2017-03 GM preliminary information on possible oil consumption, oil leaks, blue smoke, MIL or fuel-trim codes. Includes checks of the PCV system and related ventilation components on small gasoline engines. Details

NHTSA complaints: 118 keyword-matched complaints for Chevrolet TRAX 2015–2021 (of 687 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-16).

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.

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