| A hybrid-system warning appears | The vehicle has detected a fault involving a monitored hybrid or connected vehicle system. |
| The check engine light is on | An engine, emissions, electrical, cooling, fuel, or related system may require diagnosis. |
| Fuel economy has decreased | Maintenance needs, tire condition, engine performance, driving conditions, or a hybrid-system concern may be involved. |
| The vehicle hesitates or lacks power | An engine, electrical, fuel, airflow, transmission, or hybrid operating concern may require testing. |
| The engine runs more often than usual | Operating conditions, climate-control use, temperature, maintenance, or a system fault may affect hybrid operation. |
| The A/C blows warm or cools inconsistently | The system may have a refrigerant, electrical, airflow, control, or component concern. |
| You hear unusual noises | A mechanical, cooling, braking, accessory, or hybrid-related component may require inspection. |
| The vehicle is leaking fluid | An engine, cooling, brake, transmission, or other vehicle system may have developed a leak. |