2020-2024 Taycan & e-tron GT Deck Lid Module: Failure Symptoms & Programming Guide

Symptoms of a Failing Deck Lid Control Module

When the deck lid control module begins to fail on a Porsche Taycan or Audi e-tron GT, the symptoms are usually obvious and relate directly to the trunk's operation. Owners report a range of issues, from intermittent glitches to complete failure.

• Trunk Fails to Open or Close: The most common symptom is a trunk that will not respond to the key fob, interior switch, or exterior button. This can be intermittent at first, sometimes related to temperature—for example, it may fail to work when the car has been sitting in the sun.
• Trunk Opens Only Partially: The lid may begin to open but stop partway through its travel. This often requires you to manually push it open or closed.
• Failure to Latch: You may close the trunk, but the electronic latch fails to engage, leaving the lid unsecured and triggering a "Trunk Open" warning on the dashboard.
• Intermittent or Unpredictable Behavior: The trunk might work perfectly for days, then suddenly stop working, only to return to normal later. This can make diagnosis frustrating.
• Dashboard Warning Messages: A message like "Boot Emergency Release Fault" may appear on the instrument cluster, even if the trunk seems to operate correctly.

Diagnosing the Issue

Diagnosing a faulty deck lid control module involves checking for specific fault codes. While a simple code reader may not provide enough detail, professional diagnostic tools used by dealers and specialists can pinpoint the problem.

• Audi e-tron GT: A failed or improperly installed module will typically store a fault code U110100 - Component Protection Active. This code confirms that the vehicle's anti-theft system has locked out the module because it doesn't recognize it as belonging to the vehicle.
• Porsche Taycan: The Taycan may not store a specific code for "deck lid module failure." Instead, a technician using a PIWIS tester might find communication errors, such as U112300 - Data bus fault value received, which indicates a problem on the vehicle's data network that can be traced back to the module.

Programming, Coding, and Calibration Requirements

For Audi e-tron GT (2021-2024)

Audi vehicles use a security system called Component Protection. When a new or used control module is installed, the system detects that its serial number does not match the vehicle's factory records and places it in a locked state, storing the U110100 fault code. To remove this protection, the vehicle must be connected to Audi's online servers using a factory-approved diagnostic tool like ODIS (Offboard Diagnostic Information System). This procedure, sometimes called "online coding" or "GeKo authorization," can only be performed by an Audi dealer or a properly equipped independent specialist. A DIY mechanic or a shop without this specific online capability cannot make a replacement module work.

For Porsche Taycan (2020-2024)

On the Porsche Taycan, a replacement module must be coded to the vehicle's specific VIN and options using the Porsche PIWIS factory diagnostic tool. Without this step, the new module cannot communicate with the other computers in the car and will not function. After coding, a rear lid adaptation (calibration) must be performed. This procedure teaches the module the fully open and fully closed positions of the trunk lid, ensuring smooth and correct operation. While some advanced DIYers with their own PIWIS clones have performed this, it is generally considered a job for a dealer or Porsche specialist.

Buying a Used Deck Lid Control Module

Given the high cost of new OEM parts, a used module from a recycled vehicle is an excellent value. However, because of the programming requirements, there are critical factors to consider.

• Verify the Part Number: The most common OEM part number is 8W2-959-107 (or 8W2959107). You may also see revisions like 8W2-959-107-A or 8W2-959-107-B. Always match the part number on your original module to the one you are purchasing to ensure hardware compatibility.
• Factor in Programming Costs: Remember that the cost of the part is not the final cost. You must budget for the labor of a dealer or specialist to perform the Component Protection removal (Audi) or VIN coding (Porsche). Call ahead to get a quote for this service.
• Inspect for Damage: When buying a used module, check the housing for any cracks or signs of water damage. Ensure all connector pins are straight and free of corrosion.
• Source is Important: Purchase from a reputable seller who tests their parts and offers a warranty. This protects you in case you receive a non-functional unit.

Known Issues, TSBs, and Recalls

As of mid-2026, there are no specific recalls issued by the NHTSA for the deck lid control module itself on the Taycan or e-tron GT. However, both vehicles have had numerous recalls for high-voltage battery and software issues. Some trunk-related problems are addressed by Porsche in technical bulletins, such as a known issue on Taycan Sport Turismo models where water ingress can damage the rear lock. In many cases, intermittent electrical glitches may be resolved by software updates performed by the dealer.

Cost Comparison

The following prices are estimates and can vary based on your location and supplier. Labor costs are based on a typical independent shop rate.

Frequently Asked Questions (FAQ)