P0300 on 2024 Hyundai I20 Plug-in Hybrid
On a 2024 Hyundai I20 Plug-in Hybrid plug-in hybrid, OBD code behaviour can vary because the petrol engine may run less often, which changes how some efficiency, catalyst and readiness-related faults appear.
P0300 means random / multiple cylinder misfire detected.
Likely causes
- • Worn spark plugs or ignition parts
- • Injector or fueling imbalance
- • Compression-related engine issue
- • Wiring or connector issue
- • Component failure in the affected system
- • Intermittent signal or control fault
Symptoms
- • Check engine light illuminated
- • Engine shaking or rough idle
- • Loss of power under acceleration
Severity
High
Can you keep driving?
It is usually best not to keep driving for long with a misfire, because it can damage the catalytic converter and worsen engine running.
Fuel and engine specific themes
- • infrequent engine operation affecting emissions monitoring
- • engine restart and control transition-related warnings
- • sensor and catalyst efficiency faults
- • fuel and airflow-related engine fault patterns
Common fix areas
- • Inspect spark plugs and ignition coils
- • Check injector performance and fuel delivery
- • Test compression if misfire persists
- • Scan all fault codes and freeze-frame data
- • Inspect wiring, connectors and grounds
- • Confirm repair with a retest after clearing codes
FAQs
What does P0300 mean on a 2024 Hyundai I20 Plug-in Hybrid plug-in hybrid?
P0300 on a 2024 Hyundai I20 Plug-in Hybrid plug-in hybrid indicates random / multiple cylinder misfire detected. The exact root cause can still vary by the powertrain layout and any related stored faults.
Can P0300 behave differently on plug-in hybrid vehicles?
Yes. The same code can present differently depending on whether the vehicle is petrol, diesel, hybrid or another powertrain type, because emissions control, fuelling strategy and operating conditions are not the same.
Should I diagnose P0300 differently on this plug-in hybrid model?
You should still start with the standard fault-code process, but you should also consider fuel-type-specific systems and operating behaviour when diagnosing the cause.