What Happens When a Hybrid Car Goes Untouched for Months?

The question of what happens to a hybrid car if it hasn't been driven in months is a common concern for many car owners. While the internal combustion engine (ICE) is running, the car will eventually run out of fuel. After the fuel is depleted, the car may rely on the battery to power the vehicle. However, leaving a hybrid car idle for an extended period can lead to serious issues, including depleted batteries and potential damage to the engine.

In this article, we will explore the consequences of leaving a hybrid car unattended for months and provide recommendations on how to properly maintain your vehicle during long storage periods.

Real-World Experience: Our 2014 Prius Prime Case Study

Earlier this year, we placed our 2014 Prius Prime in storage for a period of 10 months. After six months, the vehicle's 12-volt accessory battery had either died or was unable to provide enough charge to power the car's accessories.

When we needed to start the car, we contacted CSAA, who provided a jump-start and recommended that we turn on the car at least once a month to ensure the battery remained operational. Today, two years later, we primarily use the car to drive approximately 110 miles to San Francisco twice each week.

What Happens to Your Car if It Remains Idle for Months?

American car manufacturers recommend that a hybrid vehicle be used for at least 15 minutes once a month to maintain its battery health. If the internal combustion engine fails to run, it suggests that the car has stopped using electricity or that the battery is entirely drained.

Leaving a hybrid car unattended for months can lead to several issues, including:

Depleted Battery: Hybrid car batteries are designed to maintain a charge even when the vehicle is not in use, but prolonged idleness can cause them to drain significantly. Reduced Battery Lifespan: Frequent discharges and recharges can lead to a decrease in battery performance over time. Engine Degradation: If the car is not used regularly, the internal combustion engine can experience issues, such as oil sludge buildup and deterioration of the catalytic converter. Driving Difficulties: If the battery is completely drained, the car may not start at all.

Recommendations for Long-Term Storage of Hybrid Vehicles

To ensure your hybrid car remains in good condition during long-term storage, follow these recommendations:

1. Put the Car in ‘Ready’ Mode

Before switching off the car, put it in 'Ready' mode for about 60 minutes. This helps the car's systems to perform a final check and can help prevent issues related to battery drain. Repeat this process at least once a week to maintain the battery charge.

2. Avoid Leaving the Car Plugged In

Leaving your hybrid car plugged into the charging station while parked for a long time can cause damage to the battery. The battery can become overcharged, leading to potential overheating or even failure. Remove the car from the charger if you are not planning to use it for extended periods.

3. Disconnect the 12-Volt Battery

If it is going to be several months before you plan to drive the car, disconnect the 12-volt battery. This prevents any electrical current from draining the battery and helps protect the car's electronics.

Conclusion

Leaving a hybrid car unattended for months can result in several issues, including battery degradation and potential engine problems. By following the recommendations outlined above, you can ensure your hybrid car remains in good condition even if it's not used frequently. Regular maintenance and intermittent use are key to keeping your hybrid vehicle running smoothly.