What causes P0300 on a Chevrolet Traverse?

Common causes of P0300 on Chevrolet Traverse: Ignition coil degradation on the 3.6L V6 LFY/LGX engine (common over 80k miles); Carbon fouled spark plugs from excessive short-trip driving on 3.6L V6; Intake manifold runner valve sticking or failing on 3.6L VVT engine; Fuel injector deposit buildup causing lean misfire on individual cylinders; Timing chain stretch causing variable valve timing errors on high-mileage 3.6L engines.

P0300

P0300 Chevrolet Traverse

Q: How much does it cost to fix P0300 on a Chevrolet Traverse?

Fixes for P0300 on Chevrolet Traverse include: Replace all 6 ignition coils with AC Delco D515C and new spark plugs, Replace spark plugs with AC Delco 41-103 double platinum at correct gap, Clean or replace intake manifold runner control valve assembly, Perform professional fuel injector cleaning service or replace stuck injectors, Replace timing chain, guides, and tensioners with updated GM kit.

Random/Multiple Cylinder Misfire Detected · Powertrain Code · High · Repair: Moderate

What is P0300?

The ECM has detected misfires occurring in multiple or random cylinders. Common causes include worn spark plugs, faulty ignition coils, vacuum leaks, low fuel pressure, or a failing catalytic converter.

When the Chevrolet Traverse triggers code P0300 (random/multiple cylinder misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Chevrolet Traverse.

This repair is rated moderate, meaning some experience and specialty tools required.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Chevrolet Traverse.

Common Causes on Chevrolet Traverse

Ignition coil degradation on the 3.6L V6 LFY/LGX engine (common over 80k miles)
Carbon fouled spark plugs from excessive short-trip driving on 3.6L V6
Intake manifold runner valve sticking or failing on 3.6L VVT engine
Fuel injector deposit buildup causing lean misfire on individual cylinders
Timing chain stretch causing variable valve timing errors on high-mileage 3.6L engines

Symptoms

Rough idle with noticeable engine vibration
Engine shaking or stumbling under load
Loss of power during acceleration
Check engine light flashing intermittently
Poor fuel economy
Hesitation or stumble on acceleration

Recommended Fixes

Replace all 6 ignition coils with AC Delco D515C and new spark plugs

Replace spark plugs with AC Delco 41-103 double platinum at correct gap

Clean or replace intake manifold runner control valve assembly

Perform professional fuel injector cleaning service or replace stuck injectors

Replace timing chain, guides, and tensioners with updated GM kit

Notes for Chevrolet Traverse

The 3.6L V6 timing chain issues typically appear above 100k miles and require significant labor.

P0300 Chevrolet Traverse

What is P0300?

Common Causes on Chevrolet Traverse

Symptoms

Notes for Chevrolet Traverse

Check Chevrolet Traverse Specs