When a 2022 Dodge Charger fires up that check engine light alongside a rough, stumbling idle, your first instinct might be panic. But P0300—the code for random/multiple cylinder misfire detected—is actually telling you something specific: the engine management system has noticed misfiring across multiple cylinders without a clear pattern pointing to just one.
Understanding the P0300 Code
Unlike cylinder-specific codes (P0301-P0308), P0300 indicates misfires are jumping around. In the 2022 Charger, this can appear in both the 3.6L Pentastar V6 and the 5.7L/6.4L Hemi V8 engines. The PCM tracks crankshaft position sensor signals to detect variations in rotational velocity—when combustion events don't produce expected acceleration, it logs misfires.
Common Symptoms You'll Notice
- Rough or shaking idle that may come and go
- Hesitation during acceleration
- Decreased fuel economy (sometimes 15-25% worse)
- Check engine light steady or flashing
- Occasional backfiring or popping sounds
- Loss of power, especially under load
What Causes Random Misfires in the 2022 Charger?
Fuel System Issues
Contaminated fuel tops the list of P0300 culprits. Water or debris in the tank affects all cylinders randomly. The Charger's returnless fuel system means whatever contamination exists circulates continuously. Bad fuel injectors can also cause this, though they typically affect specific cylinders first.
Ignition System Problems
Spark plugs in the 2022 Charger should last 100,000 miles, but gap erosion or carbon fouling can cause issues earlier, especially with performance driving. Ignition coils failing under heat load—particularly the rear cylinders on the Hemi where heat soak is worst—create intermittent misfires.
Vacuum Leaks
The intake manifold on Pentastar engines uses a composite design that can develop cracks. Any unmetered air entering the system throws off the air-fuel ratio across all cylinders. The Hemi's individual runner design makes it less susceptible but not immune.
Mechanical Issues
Low compression from worn piston rings or valve issues affects combustion efficiency. The MDS (Multi-Displacement System) in 5.7L Hemis can experience lifter problems that create intermittent misfires when the system activates.
Diagnostic Steps
- Scan for additional codes - Check for any cylinder-specific codes stored in history. P0300 often accompanies other codes that narrow down the problem.
- Inspect spark plugs - Remove and examine all plugs for wear patterns. Look for fouling, gap issues, or electrode damage.
- Check fuel pressure - Use a fuel pressure gauge to verify proper delivery. The Charger should maintain 58-62 PSI at idle.
- Smoke test for vacuum leaks - Introduce smoke into the intake and watch for escaping vapor.
- Compression test - If other causes are ruled out, test compression across all cylinders.
- Monitor live data - Watch fuel trims and misfire counters during a test drive.
Repair Costs
Repair expenses vary significantly based on the root cause:
- Spark plug replacement: $150-$350 (V6) or $250-$500 (Hemi due to access)
- Ignition coil replacement (all): $400-$700
- Vacuum leak repair: $150-$400
- Fuel injector cleaning: $100-$200
- Fuel injector replacement: $500-$1,200
- Intake manifold replacement: $600-$1,000
Can You Drive with P0300?
A steady check engine light with minor roughness usually means you can drive cautiously to a repair shop. However, a flashing check engine light indicates severe misfiring that can damage your catalytic converters within minutes. In that case, pull over safely and have the car towed.