Dealing with a jammed trunk on your Audi A8 due to a dead battery can be incredibly frustrating, especially considering the electronic trunk systems in modern cars. Many Audi A8 users have reached out to us seeking a solution to this common issue.

Today, I’m here to provide you with answers on how to open the Audi A8 trunk when faced with a dead battery.

The most convenient method to access the trunk when the battery is dead involves using the key. However, if you don’t have access to the key, you can attempt to jump-start the car. In case neither of these approaches proves effective, there’s the option of using the emergency lever key. It’s important to note that each of these methods comes with its own set of advantages and disadvantages.

Now, let’s delve into a comprehensive discussion of these three methods.

Can You Access the Audi A8 Trunk Without a Working Battery?

There are three approaches to open your Audi A8 trunk when confronted with a dead battery. The initial method involves using the emergency key that is supplied with your vehicle. The second method entails jump-starting the car to replenish the battery’s charge.

The last method employs the emergency lever key to unlock the trunk. Each of these methods has its own advantages and disadvantages, which we will thoroughly explore in this article.

Three Techniques for Opening the Audi A8 Trunk with a Dead Battery

To assist you in selecting the most suitable method for your situation, we have identified certain determining factors, including method complexity, time required for execution, and necessary tools. This allows you to make an informed decision about which method to begin with. The choice is ultimately yours.

Factors Method 1 Method 2 Method 3
Using the Key (Key Override Mechanism) Easy Easy Easy
Time Required Less than a minute Approximately 30 minutes A couple of minutes
Tools Required Car key None None

Now, let’s delve into detailed explanations of all three of these methods.

Methods for Opening an Audi A8 Trunk with a Dead Battery

Method 1: Using the Key

When your battery is dead, the smart remote won’t be of any help. In this situation, you need to use the physical key to manually override the locks.

If there are no mechanical issues with the lock, this method should work. However, if the trunk mechanism is obstructed or if there are electrical problems, it may not function as expected.

To use this method, place your key in the trunk lock and attempt to manually open it. It’s worth noting that some people have inadvertently locked their keys inside the trunk when dealing with a dead battery.


  • Convenient and straightforward.
  • Time-saving.
  • Requires no additional tools.


  • Vulnerable to electrical malfunctions.
  • Excessive force can damage the lock.

If this method doesn’t work for you, consider moving on to the next one.

How Long Does It Take to Open the Trunk with a Dead Battery? Typically, it takes around a minute to unlock the trunk using the key. However, if your car’s locking system is faulty, it may take longer to resolve the issue. Additionally, if there are electrical problems with the locking system, professional attention may be required.

Method 2: Opening the Trunk from the Inside (Valet Mode Method)

The second method involves opening the trunk from the inside, also known as the Valet mode method. This technique does not rely on battery power, making it useful in situations with a dead battery.

Valet mode is a security feature found in modern cars that triggers an alarm if unauthorized access is attempted, such as forcing open doors or trunks.

Activating valet mode allows the car owner to bypass all alarm features easily. This method is quite straightforward and takes only about a minute to complete. Here are the steps:

Step 1: Turn On the Ignition

  • Enter the car and start the ignition by pressing the start button.

Step 2: Locate the Valet Mode Button

  • Open the car’s storage compartment, and you’ll find a valet mode button in the top right corner. It will display a red indicator light and the word “valet” on top of the button.

Step 3: Deactivate Valet Mode

  • Press the valet button once to turn it off, and the red indicator will go off.

Step 4: Open the Trunk

  • With valet mode turned off, you can now attempt to open the trunk using your remote from outside the car. If all the steps are followed correctly, the trunk should open without any issues.
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Method 3: Utilizing the Emergency Release Lever

The third method involves the use of a concealed emergency button to access your car’s trunk. Many people are unaware of this hidden feature, but now that you know about it, let’s proceed with the steps on how to use this method effectively.

Step 1: Locate the Emergency Release Lever

  • To find the emergency trunk release lever, begin by checking behind the trunk cover. You’ll need to access it through the rear seats, so ensure that the back seats are unoccupied and can be easily reached.

Step 2: Pull Back the Seats and Unlock the Trunk

  • Enter the car and pull the back seats forward. Crawl beneath the trunk area, and you’ll discover the emergency release handle.
  • Now, gently pull the lever, and it will promptly unlock the trunk. If the release lever is functioning correctly, it will effortlessly unlock the trunk. However, if you encounter any issues with the emergency release lever, you may want to consider replacing it for optimal functionality.

Which Method is the Recommended Option for Opening the Audi A8 Trunk?

All three of these methods are dependable and straightforward. However, when faced with an emergency situation and limited time, the emergency release handle can be the quickest solution.

Ensure that you follow the necessary precautions and have the required tools on hand beforehand. But in the event that none of the above methods prove effective, we have an alternative solution for you.

If you happen to have a spare battery available, you can utilize it to charge your car’s battery. Once the battery is charged, you can then proceed to open the trunk using the smart remote. Let’s explore the steps for implementing this method.

How to Unlock the Audi A8 Trunk Using Jump Start

The second method involves jump-starting the car to bring it to life. Once the car is running, its alternator will automatically recharge the battery. After the battery has gained some power, you can unlock the trunk using the smart remote.

Note: Jump-starting is only feasible if the battery is in good condition. In some cases, batteries can deteriorate to a point where jump-starting is no longer possible.

Before we dive into the jump-starting procedure, let’s first identify the typical location of the battery in the Audi A8 model.

Battery Location: If you’re searching for the battery in your Audi A8, you won’t find it under the hood. Instead, the Audi A8 model’s battery is situated in the trunk, underneath the spare wheel. To access it, remove the cap and release the spare tire. Beneath the spare wheel, there is a plastic cover.

Once you’ve removed the cover, you’ll uncover the battery. The positive terminal is located on the right side, the negative terminal on the left, and an unpainted metal rod-like terminal for grounding.

Jump-Start Procedure:

Tools Required:

  • Jumper cables
  • A vehicle with a fully charged battery


  • Wear rubber gloves and protective goggles or glasses.
  • Examine the batteries for visible cracks, leaks, and damage.
  • Keep all ignition sources, such as cigarettes, sparks, flames, etc., at a safe distance.
  • Avoid direct contact with any leaking fluids from the batteries.

Now, follow these steps carefully and in the correct order:

Step 1: Position Both Vehicles

  • Place the donor vehicle so that its front faces the rear of your car. Ensure that the vehicles are close enough for the jumper cables to reach.

Step 2: Prepare the Vehicles

  • Turn off both cars and engage the parking brake. Also, ensure that the car doors, lights, and all other electronics are turned off.

Step 3: Connect the Jumper Cable

  • Follow these instructions to properly connect the jumper cable to the battery terminals:
    • First, attach one end of the red (positive) cable to the positive terminal of the dead battery.
    • Then, connect the other end of the red cable to the positive terminal of the donor vehicle’s battery.
    • Next, attach the negative cable to the negative terminal on the donor vehicle’s battery.
    • Finally, connect the other end of the negative cable to the grounding terminal. If you can’t locate a grounding terminal, attach it to a metal part of the car away from the alternator. Alternatively, you can connect it to the car’s bonnet.

Step 4: Start the Donor Vehicle

  • Start the donor vehicle and let it run for approximately 5-10 minutes. Afterward, attempt to start your car with the dead battery. It should crank and start if the battery has received enough charge. Once the dead battery has recharged sufficiently, it’s time to disconnect the cables.
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Step 5: Disconnect the Cables

  • Remove the jumper cables in the exact reverse order of attachment. Start by disconnecting the grounding cable, then the negative terminal from the donor vehicle.
  • Subsequently, remove the positive cable from the donor vehicle, followed by the positive cable from your vehicle. This order minimizes the risk of sparking or unexpected incidents.

Congratulations, you’ve successfully started your car! Now you should be able to open the trunk effortlessly. If the trunk still refuses to open, there may be another issue that needs attention.

Charging the Battery with a Car Charger

To charge the batteries using a car charger, simply employ a smart automotive car battery charger equipped with microprocessors, smart algorithms, and a temperature monitor.

Note: Avoid using basic float chargers, as they have slow charging rates, lack smart algorithms, and lack temperature sensors.


  • Wear safety glasses or goggles.
  • Wear rubber gloves.
  • Despite lithium batteries not posing a fire hazard, keep all potential ignition sources away.

Now, follow the steps below to charge the batteries using the smart car charger.

Step 1: Prepare the Battery

  • Begin by preparing the battery, which involves removing the cover and panels. Additionally, you will notice plastic caps on the battery terminals. Remove these caps and identify the positive and negative terminals.

Step 2: Connect the Charger

  • Take the positive cable of the charger and attach it to the positive terminal of the battery. Then, connect the charger’s negative cable to the car’s grounding rod. In the absence of a grounding rod, connect the cable to any metal part of the car.
  • Ensure that the negative cable is placed away from the battery during charging, as the charging process releases hydrogen gas. Hydrogen gas is highly explosive, so this precaution is crucial.
  • Turn on the charger and adjust the voltage settings, typically set to 12V for car batteries.

Step 3: Disconnect When Charged

  • Once the battery reaches a full charge, the charger will automatically shut off. At this point, remove the battery cables in the reverse order: start by removing the negative cable, followed by the positive or red cable from the terminal.

Charging with a Portable Power Station

Another convenient method for charging your car’s battery involves using a camping battery or portable power station. You will need a cigarette lighter adapter wire ready in advance. Here are the steps:

Step 1: Connect the Cigarette Lighter Adapter

  • Take the cigarette lighter adapter and connect it to the car’s connector. Then, connect the other end of the cable to the power station. The jack’s location on the power station may vary depending on the model, but it can typically be found in the 12V ‘output’ section.

Step 2: Turn On the Charger

  • Activate the charger and adjust the power station settings to match the battery’s requirements. If you find this confusing, refer to the instruction manual provided with the power station. The power station will indicate when the battery is fully charged.

You can use either of these two methods to charge your car battery, enabling you to open the trunk without any complications. While it may take some time, it is well worth the wait when you have the time to spare.

Frequently Asked Questions (FAQs)

Why Isn’t My Audi Trunk Motor Working?

  • One common reason for your car’s trunk motor not working is a weak motor. Additionally, a mechanical error may be responsible, with damaged parts in your trunk.

Why Doesn’t the Trunk Open When the Engine Is Running?

  • The trunk not opening while the engine is running is a safety feature designed to automatically lock the trunk when you start the engine. This feature ensures that no one can access the trunk while the car is in operation. Modern cars include this feature to prevent unauthorized access. To open the trunk, you’ll need to shift the car into the “park” gear.

How Much Does an Audi A8 Battery Replacement Cost?

  • An Audi A8 battery replacement typically costs between $400 and $450, which can be relatively expensive. This is why it’s often a more economical choice to recharge the batteries instead.