Chevrolet Cruze P0300: Random/Multiple Cylinder Misfire Detected

Severity: high Chevrolet Cruze Most affected: 2011–2019 (1.4L turbo)
Quick answer: On the Chevrolet Cruze (1.4L turbo), P0300 (random/multiple misfire) is most often caused by worn spark plugs or coils, or by a torn PCV diaphragm in the valve cover that creates a vacuum leak and a lean misfire. The valve-cover PCV issue is a well-known Cruze fault; check it alongside the ignition basics.

TL;DR

Chevy Cruze P0300: usually worn plugs/coils or — very commonly — a torn valve-cover PCV diaphragm causing a vacuum leak and lean misfire. Check the PCV and ignition. Typical shop cost: €120–€500 (valve cover or plugs/coils are the usual fixes).

Why Chevrolet Cruze owners get P0300

The Cruze’s 1.4L turbo is prone to a torn PCV diaphragm built into the valve cover, which creates a large vacuum leak — often causing P0300 (and lean codes like P0171) with a whistling sound and rough idle. The usual repair is a complete valve cover. Beyond that, worn spark plugs and coils cause ordinary misfires. Diagnose the PCV/vacuum leak and the ignition together for this engine.

Most likely causes on the Cruze

Likely causeProbabilityNotes
Torn valve-cover PCV diaphragm (vacuum leak)
40% 		Very common Cruze 1.4T fault
Worn spark plugs or coils
35%
Other vacuum/intake leak
25%

Chevrolet Cruze-specific known issues

  • The integrated valve-cover PCV diaphragm tears on the 1.4T, causing a vacuum leak, P0300/P0171 and a whistle.
  • The usual fix for the PCV fault is a complete valve cover assembly.
  • Worn plugs and coils cause more conventional misfires alongside.

Chevrolet Cruze P0300 repair cost

Typical shop cost (Cruze)$120–$500
DIY range (generic)$30–$300

Ranges vary by region, engine and parts grade.

Owner tips

  • Listen for a whistle at idle and check the valve-cover PCV — a classic Cruze cause.
  • Replace spark plugs on schedule and swap-test a suspect coil.
  • Smoke-test the intake to confirm a PCV/vacuum leak before parts.
Confirm the code yourself: OBD-II scanners →

Full P0300 diagnostic guide

For the complete step-by-step diagnosis, all causes, and repair walkthrough that applies to every vehicle, see the main guide: P0300 — Random/Multiple Cylinder Misfire Detected.

Chevrolet Cruze P0300 — FAQ

Why does my Chevy Cruze keep misfiring (P0300)?

On the 1.4L turbo a very common cause is a torn PCV diaphragm in the valve cover, which creates a vacuum leak and a lean misfire. Worn plugs or coils also cause misfires.

How much to fix P0300 on a Cruze?

Typically €120–€500 at a shop. A complete valve cover (for the PCV fault) or plugs and a coil are the usual repairs.

Can I drive my Cruze with P0300?

If the light is flashing, stop to protect the converter. With a steady light, drive gently and fix the PCV/ignition issue soon.