What bulb does a cargo light use?

It depends on the vehicle. Most SUVs and minivans use a festoon-style bulb, typically 31mm, 36mm, or 42mm. Trucks often use a wedge-base 194 or 168. Some newer vehicles use LED modules that aren't user-replaceable. The only reliable way to find the right bulb is to pull the old one out and match it, or look up your year, make, and model in a bulb reference guide. The wrong base won't fit, so get the exact spec before you order.

Why is my cargo light not working even with a new bulb?

A few possibilities. The door or liftgate switch that triggers the cargo light may be stuck or corroded. The fuse for the cargo light circuit may be blown. The socket contacts may be corroded, so the bulb isn't making a clean connection. Or if your vehicle has a cargo light switch on the dash or headliner panel, that switch may have failed. Start by checking the fuse. Then test the socket with a multimeter or test light. If the socket is getting power and the bulb is good, the problem is upstream in the switch or wiring.

Can I upgrade my cargo light to LED?

Yes, and it's one of the better upgrades you can make back there. LED cargo light bulbs are significantly brighter than the stock incandescent, which matters when you're loading gear in the dark. Most direct-replacement LED festoon and wedge-base bulbs fit the stock socket with no modifications. If the LED doesn't light up after installation, pull it out, rotate it 180 degrees, and reinsert it. LEDs are polarity-sensitive and only work in one orientation.

How do I access the cargo light on my SUV?

In most SUVs, the cargo light is mounted in the headliner above the rear cargo area. The lens is held by one or two Phillips screws, or it snaps into the headliner and pries off with a trim tool. Once the lens is off, you'll see a bulb socket inside. Twist the socket counterclockwise to remove it, swap the bulb, and reverse the steps. On some vehicles, the cargo light is built into the liftgate itself rather than the headliner. Check both locations if the one you're looking at has no bulb socket behind it.

Is a burned out cargo light worth fixing yourself?

Almost always yes. Cargo light bulbs cost a few dollars and the job takes 10 to 20 minutes. A shop will charge at least a half-hour of labor, which can be $60 to $100, for something this straightforward. The tools you need are minimal, usually just a trim removal tool or a flathead wrapped in tape to protect the headliner. The only exception is if the lens housing is broken and the replacement part is expensive, or if the problem turns out to be a failed switch or wiring issue that needs a more involved repair.

How to Replace a Cargo Light (Step by Step)

Cargo light out in your truck or SUV? Usually a trim tool and a cheap bulb is all you need. Here's how to get it done in about 20 minutes.

What You'll Need

Replacement cargo light bulb matched to your year, make, and model (festoon or wedge-base)
Trim removal tool or a flathead screwdriver wrapped in tape to protect the headliner
Phillips head screwdriver (if your lens is screw-mounted)
A small flashlight to see into the housing
About 15 to 20 minutes

Step by Step Instructions

Find the Cargo Light

In most SUVs and minivans, the cargo light is in the headliner above the rear cargo area, close to the liftgate. It usually looks like a rectangular or oval lens flush with the ceiling material. On pickup trucks, check the back wall of the cab just above the rear window. A few trucks mount the cargo light on the bed rail near the cab instead. If your vehicle has a cargo light switch on the dash or overhead console, use that to figure out which circuit you're dealing with. If you're not sure your vehicle has one, check the owner's manual under interior lighting.

Remove the Lens or Cover

Look at the lens carefully before you touch it. If there are visible Phillips screws, remove them first. The lens will drop down or pull away once the screws are out. If there are no screws, the lens is snap-fit. Slide your trim removal tool into the seam on one edge and push gently toward the center of the lens. Work around the perimeter slowly. There are usually two or three plastic tabs holding the lens in place. Rushing this is how the lens or the surrounding headliner panel gets cracked. Take an extra 30 seconds and be deliberate.

Remove the Bulb Socket

With the lens off, shine your flashlight inside the housing. Most cargo lights use a festoon-style bulb, which is a tube-shaped bulb that sits between two spring metal clips. To remove a festoon bulb, push one end toward the clip that holds it, which compresses the spring slightly, then angle the other end out first. The bulb slides free from there. If yours has a separate socket with a wedge-base bulb, twist the socket counterclockwise a quarter turn and pull it out. Check the contacts inside the socket. Corroded contacts cause intermittent failures and short bulb life, so clean them with fine sandpaper if they look discolored.

Match and Install the New Bulb

Hold the old bulb next to the new one before you install it. Festoon bulbs come in 31mm, 36mm, and 42mm lengths and those few millimeters matter. A bulb that's even slightly too long won't seat properly between the clips. Wedge-base bulbs have different pin spacings, so confirm the base matches, not just the glass shape. Once you've confirmed the match, install the new bulb by reversing the steps. Festoon bulbs snap between the spring clips, end first. Wedge-base bulbs push straight into the socket. If you're using an LED replacement and it doesn't light up, pull it out, rotate it 180 degrees, and try again. LEDs only work in one polarity orientation.

Test Before Closing Up

Before you snap or screw the lens back into place, test the light. Open a door or the liftgate to trigger the automatic circuit, or use the cargo light switch on the dash if your vehicle has one. The light should come on immediately. If it doesn't, check that the bulb is fully seated and the socket is locked back into the housing. If it still won't light up with a good bulb, the problem is likely a blown fuse, a failed switch, or a corroded socket. Check the fuse first since that's a two-minute fix.

Reinstall the Lens

Line up the tabs on the lens with the corresponding slots in the housing. For snap-fit lenses, press evenly around the perimeter until you feel each tab click. Don't just push the center. If a tab doesn't click, it isn't seated, and the lens will rattle or fall out. For screw-mount lenses, hold the lens in position and thread the screws in by hand before snug-tightening with a screwdriver. Plastic headliner panels strip easily so stop as soon as the lens is held firmly. The finished lens should sit completely flush with the headliner around it.

Tips and Things to Watch For

Wrap your trim tool before you use it. Headliner fabric and plastic panels scratch easily. A couple wraps of painter's tape or a rag around the tip of a flathead screwdriver is all you need to protect the surrounding surface while you pry the lens out.
Match the bulb length exactly if it's a festoon. A festoon bulb that's a few millimeters too long won't seat between the spring clips, and a bulb too short will fall out. Measure the old bulb or note the number printed on the side before you order a replacement.
If the new bulb blows quickly, suspect the socket. Corroded contacts create resistance that overheats bulb filaments. Cleaning the contacts with fine sandpaper before installing the new bulb takes two minutes and prevents you from going through another bulb in a month.
Check the fuse if the new bulb still doesn't work. Most cargo light circuits share a fuse with other interior lights. Your owner's manual has the fuse diagram. A blown fuse is a five-minute fix that's easy to miss if you skip straight to the wiring.

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