Underglow Lights in Illinois (2026): The Complete Legal Guide

You see them cruising down the highway. Neon lights glowing underneath the car. They look pretty cool, right? Here’s the thing: in Illinois, those underglow lights might get you pulled over. The rules around underglow are surprisingly strict, and penalties can be real. Let’s break down what you actually need to know.

Most people assume underglow is totally fine. They find out the hard way that it’s not. This guide explains exactly what Illinois law says about it.

What Is Underglow Lighting?

Underglow lights are lights mounted under your vehicle. They illuminate the ground beneath your car. Basically, they create a glowing effect under the chassis.

These lights come in different colors. Blue, red, purple, green—you name it. Some people think they look awesome on their cars. Honestly, I get why they’re tempting.

So why does the law care about them? Here’s the thing: Illinois has strict rules about what lights your car can display. Underglow falls right into that category.

Illinois Underglow Laws Explained

What’s Actually Illegal

Okay, here’s where things get serious. In Illinois, underglow lighting is pretty much banned. You cannot have any color-changing lights mounted underneath your vehicle.

The law covers all underglow lights. It doesn’t matter what color they are. It doesn’t matter if they’re off or on. Simply having them installed can get you cited.

But wait, there’s a small exception. Some people use underglow in very specific ways. Let me break down what actually violates the law versus what might be okay.

The White Light Exception

Here’s the one gray area. White underglow lights might be legal in certain situations. Think of it like a loophole, but even this one’s questionable.

Most police officers still cite white underglow. Why? Because even white lights can distract other drivers. The safest move is to avoid underglow altogether.

Wondering if your specific lights might be legal? Honestly, the safest answer is no. When in doubt, don’t install them.

Red and Blue Lights

These are absolutely illegal. Seriously, don’t even think about it. Red and blue lights are reserved for emergency vehicles like police cars and ambulances.

If you get caught with red or blue underglow, the consequences jump way up. The cops take emergency light colors very seriously. You could face felony charges in some situations.

Other Colors

Purple, green, yellow, orange underglow? All illegal. Any color-changing lights underneath your car violate Illinois law.

The state wants to keep roads predictable and safe. Emergency lights need to stand out. Your car should look like a regular vehicle, not a rolling light show.

Penalties and Consequences

Not sure what happens if you get caught? Let me be real with you: it’s not pretty.

Fines

First offense? You’re looking at a fine between $100 and $500. That’s real money out of your pocket. Some citations come with additional fees too.

Think of it like a traffic ticket, but with more money involved. It goes on your driving record. Insurance companies might see it.

Vehicle Inspection Failure

Here’s another consequence most people miss. Your car will fail Illinois vehicle inspection if it has underglow lighting. You can’t register your vehicle until the lights come off.

That means you literally cannot legally drive the car. You’ll have to remove the underglow before you can get it inspected. Then you pay for the inspection.

Repeated Violations

Get caught twice? The penalties increase. Fines go up. You might face additional charges. Third offense? You could be looking at criminal charges, not just traffic violations.

This part can be tricky, honestly. Each citation stacks on top of the previous one. The state sees it as a pattern of ignoring the law.

Potential Criminal Charges

Wait, it gets more serious. Depending on circumstances, underglow violations can become criminal charges. Most first offenses are traffic violations. But repeat offenders can face misdemeanor charges.

A misdemeanor stays on your record. It affects job applications. Some professional licenses won’t allow misdemeanor convictions. That’s way worse than a simple traffic ticket.

How to Know If You’re Violating the Law

Still confused about whether your lights count as a violation? Let me break it down.

If your vehicle has lights mounted underneath it that create a glow effect, you’re probably breaking the law. If the lights are any color other than white, you’re definitely breaking the law. If the lights change color or flash, you’re absolutely breaking the law.

There’s really not much gray area here. The safest approach is simple: don’t have underglow at all.

Honestly, this is the part most people get wrong. They think their specific setup is fine. Then they get pulled over and find out it’s not. Don’t be that person.

What About Other Light Modifications?

Okay, pause. Read this carefully. Illinois has rules about lots of car light modifications, not just underglow.

Headlight Modifications

You cannot have blue or purple headlights. They must be white or amber. You also cannot cover your headlights with anything that changes their color. Some tint covers are legal. Most colored covers are not.

Tail Light Modifications

Your brake lights must be red. You cannot tint them so dark they don’t work properly. Some mild tinting is allowed. Extreme tinting is not.

Interior Lights

Interior lights? Generally fine. Light up your dashboard however you want. Nobody cares about your interior lighting situation.

Spotlights and Neon

These are also illegal. Neon signs, decorative lighting, spotlights that shine outside the vehicle? All violate Illinois law. The state wants vehicles to look normal.

Recent Changes and Updates

Illinois hasn’t changed its underglow laws recently. The rules have been in place for years. They’re not getting relaxed anytime soon.

However, police enforcement has increased. More officers are citing underglow violations now than in previous years. That’s why it’s important to know the rules right now.

Some people think changing laws means they’ll become legal. Don’t count on it. Illinois is actually getting stricter, not more lenient.

How to Remove Underglow and Stay Compliant

Got underglow right now? Here’s what you need to do.

First, remove the lights completely. You cannot keep them installed even if you promise not to turn them on. Just having them there violates the law.

Second, get a professional to remove them properly. Don’t rip them out yourself and damage your car’s undercarriage. A shop can remove them safely.

Third, get a vehicle inspection. Once the lights are gone, your car will pass inspection. Then you can register and legally drive it.

This one’s actually pretty straightforward. You don’t need special permission. You don’t need to register the removal. Just take them off and you’re good.

Special Circumstances

Parked Vehicles

Does it matter if your car is parked? Nope. The law covers parked vehicles too. If you park on the street with underglow on, you can still get cited. If you’re in a parking lot, same rule applies.

Some people think it’s okay as long as the lights are off. Not quite. The law says you cannot have the equipment installed, period. Whether it’s on or off doesn’t matter.

Show Cars and Events

Can you use underglow at car shows? Most car shows prohibit underglow for legal reasons. The organizers know the risks. They don’t want legal trouble.

Personally, I think this makes sense. Even at car shows, the law technically still applies. Event organizers are protecting themselves and you.

Private Property

What if you’re on private property with underglow on? The law still technically applies. But enforcement is less likely. Police focus on public roads.

That said, don’t assume you’re protected just because you’re private. An officer could cite you if they see it, even on your own driveway.

Frequently Asked Questions

Can I have underglow if I keep it off?

No. Simply having the lights installed violates the law, even if they’re never turned on. The equipment cannot be on your vehicle at all.

Are white underglow lights legal?

Technically gray area, but most officers still cite them. The safest answer is no. Why risk it?

What if I have underglow but don’t drive the car?

If it’s registered in Illinois, it needs to pass inspection. It won’t pass with underglow. You cannot legally register it.

Can I fight a underglow ticket in court?

You can try, but Illinois law is pretty clear. Most judges won’t dismiss the citation. Your best option is to remove the lights and not get cited again.

Do other states have different underglow laws?

Yes, absolutely. Some states are stricter. Some are more lenient. Illinois falls in the strict category. Always check the laws where you’re driving.

Final Thoughts

Here’s the reality: underglow lights look cool, but they’re illegal in Illinois. The law is clear. The penalties are real. Enforcement is happening.

You’ve got two choices. Either remove the underglow and stay legal, or keep it and risk fines, inspection failures, and possible criminal charges. It’s not worth the hassle.

Stay informed, stay legal, and keep your car looking normal for Illinois roads. When in doubt about any vehicle modifications, ask a lawyer or contact your local police department’s non-emergency line.

References

Illinois Vehicle Code Title 625, Chapter 5, Section 5/12-101 – Official state statute on vehicle lighting

Illinois Secretary of State Vehicle Inspection Requirements – Vehicle inspection guidelines and requirements

Illinois Department of Transportation – Vehicle Laws – State transportation laws and regulations

Chicago Police Department Non-Emergency Line: 311 – Contact for local clarification on vehicle modifications

Illinois State Police Motorist Information – State police resources for vehicle questions