How To Open Mercedes Benz Trunk Without Key: Lucky 7 Ways

Finding yourself locked out of the trunk on your Mercedes-Benz can be stressful, especially if your keys are lost, broken, or locked inside. Whether you drive an older E-Class or a modern C-Class, there are practical methods to open the trunk without the key.

This guide runs through seven proven ways to access your trunk, including tips for both emergency situations and common Mercedes features. Always remember, some methods depend on your specific model and year, so check your owner’s manual if possible before trying these steps.

Use the Interior Trunk Release Lever

Most Mercedes-Benz sedans and coupes have an interior trunk release, usually located on the driver's side near the seat or integrated into the driver’s door. On recent models, this release may be a button marked with a trunk icon. If you have access to the car's interior and the vehicle’s battery is not dead, this is the simplest solution.

Older models, like the W210 E-Class, often have a mechanical lever or pull cable inside the glove box or near the driver’s footwell. For newer models (like the W204 C-Class, W212 E-Class), look for the electronic button. If the battery is dead, the electronic release will not work, but the manual lever (if present) should still function.

Fold Down the Rear Seats for Direct Trunk Access

If your Mercedes has foldable rear seats, you may be able to access the trunk by folding them down. Look for release handles or buttons at the top of the rear seatbacks or in the trunk (if you can reach through). Some models, such as the C-Class and E-Class sedans, have a 60/40 split seat that can be dropped for cargo access.

Once the seats are folded, reach into the trunk and locate the emergency trunk release handle. In U.S. models after 2002, federal law requires a glow-in-the-dark emergency release inside the trunk. Pulling this handle will pop the trunk open from the inside. This method is especially useful if the keys are locked in the trunk and the main cabin is accessible.

Use the Key Fob’s Mechanical Emergency Key

All modern Mercedes-Benz key fobs contain a hidden mechanical key. Look for a small release switch or button on the fob body, then slide out the metal key blade. This key can open the driver’s door even if the battery in the fob, or in the car, is dead.

Once inside, some Mercedes models allow you to use the mechanical key in a concealed trunk lock cylinder. Look for a keyhole above or near the license plate, sometimes hidden by a plastic cap. Insert the mechanical key and turn-this should mechanically open the trunk, even if the car’s battery is flat. Some newer models don’t have this feature, but it’s common on many E-Class, S-Class, and older C-Class vehicles.

Jump the Trunk Release Circuit with a Portable Power Source

If your car battery is dead, the electronic trunk release will not work. However, you can provide temporary power to the vehicle using a portable jump starter. On many Mercedes models, there is a positive (+) terminal under the hood, often covered by a red plastic cap. Connect the positive clamp to this terminal and the negative clamp to a bare metal ground on the chassis.

With power restored, use the interior trunk release or the button on the key fob to open the trunk. This avoids the need to jump the car’s main battery directly and can be safer. If you don’t have a jump starter, you can use regular jumper cables and another car, but a portable jump box is more convenient if you’re alone.

Try the Trunk Release Button on the Key Fob

Most Mercedes-Benz models with keyless entry have a dedicated trunk release button on the key fob. It is usually marked with a trunk icon, and holding it for a few seconds should pop the trunk. This works if the vehicle’s battery and the fob’s battery are both functional.

If the trunk does not open, the issue could be a dead fob battery or a fault with the trunk actuator. In some cases, replacing the fob battery (a simple coin cell) can restore functionality. If pressing the button doesn’t work and you suspect a mechanical problem, you will need to try another method from this list.

Access via Ski Pass-Through or Rear Armrest Compartment

Some Mercedes-Benz models, especially E-Class and S-Class, have a rear seat pass-through for skis or long items. If your model has this feature and it is not locked, you can reach into the trunk through this opening. Remove the center armrest or open the pass-through hatch to gain access to the trunk interior.

Once you can reach inside, look for the emergency trunk release handle. You may need a long tool or stick to pull the release if it is far away. This method is often overlooked, but it is effective if the trunk is otherwise inaccessible and the rear seatbacks do not fold.

Call a Professional Locksmith or Mercedes Roadside Assistance

If all else fails, contacting a professional locksmith or Mercedes-Benz Roadside Assistance is the safest move. Skilled locksmiths can open trunks using specialized tools without damaging the vehicle. Mercedes-Benz Roadside Assistance can also help owners access their car, especially if you can provide proof of ownership.

This option may require waiting, but it is usually the best choice if you are locked out and none of the DIY methods are successful. Avoid trying to pry open the trunk with force or using slim jims, as this can cause expensive damage to the trunk latch or paintwork.

Frequently asked questions