The 2022 Tucson's 2.5L Smartstream engine should deliver smooth power. When misfires cause vibration and throw a P0300 code, something is disrupting combustion across multiple cylinders. Let's track down what's causing your Tucson to shake.
Understanding P0300
The P0300 code indicates "Random/Multiple Cylinder Misfire Detected." Unlike codes pointing to a specific cylinder (P0301-P0304), random misfires suggest a problem affecting all cylinders—typically fuel, air, or a common ignition component.
Symptoms You're Experiencing
- Engine vibration felt through steering wheel and seat
- Check engine light (may flash if severe)
- Rough idle
- Hesitation during acceleration
- Possible fuel smell
- Reduced power
The Smartstream Engine
The 2.5L Smartstream four-cylinder in the 2022 Tucson uses Continuously Variable Valve Duration (CVVD), direct injection, and other advanced technologies. These systems require proper operation for smooth running. Issues with any component can cause misfires.
Common Causes of P0300
- Spark plug issues: Worn or fouled plugs in multiple cylinders
- Ignition coil failure: Although typically affects one cylinder at a time
- Fuel system problems: Low pressure, contaminated fuel
- Vacuum leak: Unmeasured air creating lean conditions
- CVVD system issue: Variable valve duration malfunction
- Carbon buildup: On intake valves from direct injection
Diagnostic Steps
- Check for additional cylinder-specific codes
- Inspect spark plugs for wear or contamination
- Look for vacuum leaks
- Monitor fuel pressure and fuel trim data
- Check for CVVD-related codes
Direct Injection Consideration
Direct injection engines don't wash intake valves with fuel, allowing carbon deposits to build up. At relatively low mileage this shouldn't be an issue, but if other causes are ruled out, carbon buildup should be considered.
Repair Costs
- Spark plugs: $100-$250
- Ignition coils: $75-$175 each
- Vacuum leak repair: $100-$400
- Fuel system service: $150-$300
- CVVD system repair: $500-$1,500
Your 2022 Tucson is under warranty—have Hyundai diagnose the issue at no charge.