When you sit in your car and turn the key or press the start button, you might notice different ignition modes—OFF, ACC, ON, and START. But what exactly does ACC mean? Many drivers ask, “What is ACC in a car?” In this guide, we’ll explain what ACC power is, why it matters, and how to use it properly.
What Is ACC in a Car?
ACC in a car stands for Accessory Power. It’s a setting on your ignition switch (or push-start system) that allows you to power certain electrical components—such as the radio, charging ports, or power windows—without fully starting the engine.
In simple terms:
- OFF – No power to the car.
- ACC (Accessory) – Powers non-essential electronics.
- ON – Powers all systems without starting the engine.
- START – Cranks the engine.
So, ACC power is the mode that gives you electricity for comfort and entertainment features, but without running the engine.
Read: How to Prevent Dash Cam from Draining Battery
How Does ACC Power Work?
When you turn your key or press the start button once (without pressing the brake), your car enters power ACC mode. In this position, the car’s electrical system directs energy to low-power circuits like the stereo, infotainment system, and phone chargers.
This helps save fuel and reduces wear on the engine, since you’re not idling the car just to listen to music or use your phone.
When Should You Use ACC Power?
Here are a few common situations where ACC mode in a car is useful:
- Listening to music without the engine running
- Charging devices while parked
- Rolling down power windows
- Using infotainment or navigation system briefly
However, keep in mind that running electronics in ACC mode for a long time can drain your car battery.
ACC vs. ON Position
Many drivers confuse ACC power with the ON position. Here’s the difference:
- ACC mode: Only accessory circuits are powered.
- ON mode: All vehicle electronics, dashboard systems, and sensors are active (but the engine is still off).
If you only need radio or charging, stick with power ACC. If you’re preparing to start the car or need full system access, use the ON mode.
Does ACC Mode Drain Car Battery?
Yes, using ACC in a car for too long can drain the battery, especially if you power high-demand devices. For example:
- Playing music for 10–15 minutes is usually fine.
- Leaving accessories on for an hour or more could weaken the battery and make it harder to start the engine.
Tip: If you often use accessories while parked, consider a battery monitor or portable jump starter for peace of mind.
Frequently Asked Questions (FAQs)
1. What does ACC mean in a car ignition?
ACC means Accessory Power Mode, which powers electronics like the radio, charger, and infotainment without starting the engine.
2. Can I leave my car in ACC mode?
Yes, but only for short periods. Long use may drain the battery.
3. How do I turn on ACC with a push-button start?
Press the start button once without pressing the brake pedal—this activates power ACC mode.
4. Is ACC bad for the car?
No, ACC is safe to use. Just avoid leaving it on for extended periods to protect your battery.
Conclusion
So, what is ACC in a car? It’s the Accessory Power Mode, designed to let you use your car’s electronics without running the engine. Whether you call it ACC power or power ACC, it’s a convenient feature for entertainment and comfort—just remember to use it wisely to avoid draining your battery.