P0300 Chevrolet Tahoe
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 Tahoe 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 Tahoe.
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 Tahoe.
Common Causes on Chevrolet Tahoe
- AFM/DOD lifter failure causing collapsed lifter on 5.3L or 6.2L V8 (Tahoe, Suburban, Yukon)
- Worn AC Delco spark plugs past 100k-mile service interval
- Ignition coil internal short causing intermittent misfire under load
- Fuel injector sticking or leaking on high-mileage 5.3L engines
- Intake manifold gasket leak introducing unmetered air into combustion chambers
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
Notes for Chevrolet Tahoe
Identical AFM lifter issues as GM_TRUCK_V8; Escalade 6.2L uses same platform and shares failure patterns.