How To Change A License Plate Bulb

A burned-out license plate bulb might seem like a minor issue, but it can actually lead to unwanted attention from law enforcement and even impact your vehicle's safety. Replacing it is a quick and easy DIY project that can save you time and money. This article will guide you through identifying the problem, understanding its cause, and fixing it yourself.

Is Your License Plate Light Out? Know the Symptoms

Knowing the symptoms of a failing or failed license plate bulb will help you diagnose the issue quickly. Here are the most common signs:

• No illumination of the license plate at night. This is the most obvious symptom.
• Dim or flickering light emanating from the license plate area. This indicates a bulb that is on its way out.
• A warning light on your dashboard. Some newer vehicles are equipped with systems that monitor exterior lights and will alert you to a burnt-out bulb. The warning light may be a generic "bulb out" indicator or specifically identify the license plate light. Consult your owner's manual.
• Intermittent illumination. The light works sometimes, but not others. This is often a sign of a loose connection or a bulb that is nearing the end of its life.
• Error message on your vehicle's information display. Similar to a warning light, some vehicles provide specific error messages related to malfunctioning lights.

Understanding the Root Cause: Why License Plate Bulbs Fail

License plate bulbs fail for several reasons, most commonly due to the nature of incandescent bulbs. Understanding these reasons can help you prevent future problems.

• Normal Wear and Tear: Like all incandescent bulbs, license plate bulbs have a limited lifespan. The filament inside the bulb gradually weakens over time due to heat and vibration, eventually causing it to break.
• Vibration: Vehicles are constantly subjected to vibration, especially when driving on rough roads. This vibration can accelerate the wear and tear on the bulb's filament, leading to premature failure.
• Moisture Intrusion: If the license plate light housing is not properly sealed, moisture can seep inside, causing corrosion and short circuits. This is particularly common in areas with high humidity or where vehicles are exposed to frequent rain or snow.
• Voltage Fluctuations: Spikes or dips in the vehicle's electrical system can damage the bulb's filament. This can be caused by a faulty alternator or other electrical components.
• Poor Quality Bulbs: Using cheap or low-quality replacement bulbs can significantly shorten their lifespan. Always opt for reputable brands known for their durability.
• Loose Connections: A corroded or loose connection at the bulb socket can cause intermittent or complete failure.

The Consequences of Ignoring a Burnt-Out License Plate Bulb

Driving with a burnt-out license plate bulb may seem insignificant, but there are potential consequences you should be aware of:

• Legal Issues: Most jurisdictions require that license plates be clearly visible at night. Driving with a burnt-out bulb is a traffic violation that can result in a fine.
• Reduced Visibility: A properly illuminated license plate makes your vehicle easier to identify at night, which can be crucial in emergency situations.
• Safety Concerns: While not directly related to vehicle operation, a malfunctioning light can draw unnecessary attention from law enforcement, leading to a roadside stop that could be avoided. In addition, in the event of an accident, a clearly visible license plate is essential for identification.
• Vehicle Inspection Failure: Many states include license plate light functionality as part of their mandatory vehicle safety inspections. A burned-out bulb can cause you to fail inspection, requiring you to make repairs before you can legally operate the vehicle.

Recommended Fixes: A Step-by-Step Guide

Replacing a license plate bulb is a relatively simple DIY task. Here's a general guide; always refer to your vehicle's owner's manual for specific instructions, as the location and access method can vary:

1. Gather Your Tools and Materials:
   • New license plate bulb (check your owner's manual for the correct bulb type)
   • Screwdriver (usually Phillips or flathead, depending on the housing)
   • Pliers (optional, for removing stubborn bulbs or connectors)
   • Gloves (optional, to protect your hands)
   • Safety Glasses (recommended)
2. Turn Off the Vehicle and Engage the Parking Brake: Safety first! Ensure the vehicle is completely off before working on any electrical components.
3. Locate the License Plate Light Housing: The housing is usually located above or to the side of the license plate.
4. Access the Bulb:
   • Some housings have screws that need to be removed to access the bulb.
   • Others may have a snap-in cover that can be pried open with a screwdriver. Be careful not to break the plastic.
   • Some vehicles require you to access the bulb from inside the trunk or hatch. There may be an access panel that needs to be removed.
5. Remove the Old Bulb:
   • In some cases, the bulb will simply pull straight out of the socket.
   • Other times, you may need to twist the bulb to release it.
   • If the bulb is stuck, use pliers to gently grip it and pull it out.
6. Install the New Bulb:
   • Align the new bulb with the socket and push it in or twist it into place, depending on the design.
   • Make sure the bulb is securely seated in the socket.
7. Test the Light:
   • Turn on the vehicle's parking lights or headlights to test the new bulb.
   • If the bulb doesn't light up, double-check that it's properly seated in the socket and that you've used the correct bulb type. Also, check the fuse for the license plate lights (refer to your owner's manual for fuse location).
8. Reassemble the Housing: Reinstall the housing cover or screws, making sure everything is properly secured.
9. Clean Up: Dispose of the old bulb properly.

Cost Estimates and Shop Advice

Replacing a license plate bulb is an inexpensive repair. The cost will vary depending on whether you do it yourself or take it to a shop.

• DIY Cost: The cost of a replacement bulb is typically between $5 and $15. You may already have the necessary tools on hand.
• Shop Cost: If you take your vehicle to a mechanic, you can expect to pay between $20 and $50 for the replacement, including the cost of the bulb and labor. The labor charge is usually minimal since the repair is quick and easy.

Shop Advice: If you're uncomfortable working on your vehicle's electrical system, or if you're unsure about the correct bulb type, it's best to take it to a qualified mechanic. However, for most people, this is a very manageable DIY project.

Upgrading to LED Bulbs: Consider replacing your incandescent bulbs with LED bulbs. LED bulbs are more energy-efficient, last longer, and provide a brighter, whiter light. While they may be slightly more expensive upfront, they can save you money in the long run by reducing the frequency of replacements.

Technical Service Bulletins (TSBs) and Community Data: While there aren't typically TSBs specifically for license plate bulb replacements (as they are considered routine maintenance), online forums and community data for your specific vehicle make and model can be invaluable. You might find information about common bulb types used, specific housing removal instructions unique to your vehicle, or even tips on preventing moisture intrusion in the housing. Searching "[Your Vehicle Make and Model] license plate bulb replacement" will likely yield helpful results.

Common Mileage/Time for Failure: Incandescent license plate bulbs typically last between 1-3 years, or approximately 12,000 to 36,000 miles, depending on usage and driving conditions. LED replacements are known to last significantly longer – often 5 years or more.