2006 Audi A4 Fuel Pump Control Module Location: Complete Guide for Owners

The bottom line: On a 2006 Audi A4, the fuel pump control module is located behind the trim panel on the right side of the trunk, mounted near the rear wheel well. This small electronic module controls the fuel pump speed and pressure, and it is a common failure point on this generation of the A4, especially on the 2.0T FSI engine. If your car cranks but won't start, stalls randomly, or shows a check engine light with fuel pressure codes, the module is very likely the first thing to inspect.

This guide breaks down everything you need to know about the fuel pump control module on the 2006 Audi A4: where exactly it sits, how to access it, what symptoms indicate a bad module, and how to test it before spending money on a replacement.

1. Why the 2006 Audi A4 Fuel Pump Control Module Matters

The 2006 Audi A4 belongs to the B7 generation, produced from 2004 through 2008. This generation includes the 2.0T FSI turbocharged engine as well as the 3.2L V6. Both engines rely on a two-stage fuel system: a low-pressure pump inside the fuel tank feeds fuel to a high-pressure pump driven by the camshaft, which then delivers fuel to the direct injection system. The fuel pump control module, sometimes called the fuel pump driver module, manages the low-pressure pump's speed and regulates fuel delivery based on engine demand.

On the 2006 A4, the module also monitors fuel pressure and communicates with the engine control unit. When the module fails, fuel delivery drops, and the engine may lose power, hesitate under load, or refuse to start at all. Given that this part sits in a location prone to moisture exposure, corrosion and electrical failure are common issues reported by owners.

2. Exact 2006 Audi A4 Fuel Pump Control Module Location

The fuel pump control module on the 2006 Audi A4 is located behind the right side trunk liner, near the rear wheel arch. More specifically, follow these steps to find it:

  1. Open the trunk and remove the floor mat or any cargo covering the spare tire area.
  2. On the right side of the trunk, you will see a fabric or plastic trim panel covering the wheel well area.
  3. Pull back the trim panel — it is held in place by plastic clips or push pins. You can use a trim removal tool to avoid breaking them.
  4. Behind this panel, mounted vertically on the inner fender wall, you will find a small black rectangular electronic module with a multi-pin electrical connector. This is the fuel pump control module.

In some B7 models, the module is mounted slightly lower, closer to the rear taillight assembly, but it remains within the same general area. The exact mounting position can vary slightly depending on whether the car has the optional Bose sound system or other trunk-mounted electronics, but the right rear wheel well area is the standard location.

3. What Does the Fuel Pump Control Module Look Like?

The module on a 2006 Audi A4 is a compact black plastic box, roughly the size of a deck of cards. It has a single large electrical connector on one end and may have a metal mounting bracket attached. Depending on the exact part number, the module may be labeled with the Audi part number or a VAG group number. Common part numbers for this module include 4F0906093L or 8K0906093E, depending on the specific production date and engine configuration.

If you are buying a replacement, always cross-reference your original part number with the new unit to ensure compatibility. Some aftermarket modules list compatibility across multiple Audi models, including the A4, A5, and Q5, but the 2006 A4 B7 typically uses a specific version.

4. How the Fuel Pump Control Module Works

The fuel pump control module does not simply turn the pump on and off. It uses a pulse-width modulation signal to control the speed of the in-tank fuel pump. The engine control unit sends a requested fuel pressure value, and the module adjusts the pump speed accordingly. This allows the system to maintain consistent fuel pressure across different engine loads and speeds, which improves fuel efficiency and reduces wear on the fuel pump itself.

On the 2006 A4 with direct injection, the low-pressure fuel system operates at roughly 4-6 bar (58-87 psi). If the module fails, the low-pressure pump may run at full speed constantly, or not at all, depending on the failure mode. Both scenarios cause drivability problems and often trigger fault codes in the engine control unit.

5. Common Symptoms of a Failing Fuel Pump Control Module

Recognizing the symptoms of a bad fuel pump control module can save you time and money. The following issues are commonly reported by 2006 Audi A4 owners when the module starts to fail:

  1. Engine cranks but won't start. The most common symptom. The starter turns the engine over, but there is no fuel pressure, so the car never fires up. If you hear the fuel pump priming for a second when you turn the key to the ON position, the pump itself is likely fine; the problem is the module not receiving or sending the correct signal.
  2. Intermittent stalling. The car may run fine for a while, then suddenly lose power and stall. After waiting a few minutes, it may restart. This points to the module overheating or failing intermittently.
  3. Long crank time before starting. The engine takes several seconds of cranking before it catches. This indicates that fuel pressure is building up slowly, often because the module is not commanding the pump to run at full speed during startup.
  4. Check engine light with fuel pressure codes. Common fault codes include P0191 (Fuel Rail Pressure Sensor Range/Performance) and P0087 (Fuel Rail/System Pressure Too Low). These codes indicate that the engine control unit is not seeing the expected fuel pressure, and the fuel pump control module is often the root cause.
  5. Engine runs rough or lacks power under load. When you accelerate hard, the fuel pump needs to deliver more fuel. A failing module may not respond quickly enough, causing hesitation or a feeling of fuel starvation.
  6. No fuel pump prime noise. When you turn the ignition to the ON position, you should hear a brief whirring sound from the rear of the car as the fuel pump primes. If you hear nothing, the module may not be powering the pump at all.

6. How to Test the Fuel Pump Control Module

Before replacing the module, you can perform a few simple tests to confirm it is the culprit. These tests require basic tools and a digital multimeter.

Test 1: Listen for Fuel Pump Prime. Turn the ignition key to the ON position without cranking the engine. You should hear the fuel pump run for about two seconds. If you hear nothing, the pump may not be receiving power. This could be the module, the pump itself, or a wiring issue.

Test 2: Check for Power at the Module. Locate the module behind the right trunk trim. Disconnect the electrical connector and use a multimeter to check for battery voltage at the power pins with the ignition ON. If you have power at the connector but the pump does not run, the module is likely faulty.

Test 3: Measure Fuel Pressure. Connect a fuel pressure gauge to the fuel rail service port. With the ignition ON, the pressure should rise to approximately 4 bar (58 psi). If the pressure stays at zero or rises very slowly, the pump is not being commanded properly, which points to the module.

Test 4: Check for Fault Codes. Use an OBD-II scanner that can read manufacturer-specific codes. If you see P0191 or P0087, combined with the symptoms above, the fuel pump control module is a strong suspect.

7. How to Replace the 2006 Audi A4 Fuel Pump Control Module

Replacing the fuel pump control module is a straightforward DIY job that typically takes 30 to 45 minutes. Here is the step-by-step process:

  1. Disconnect the negative battery terminal. Wait at least 5 minutes for the airbag system capacitors to discharge.
  2. Open the trunk and remove the contents. Pull back the right side trim panel as described above.
  3. Locate the fuel pump control module. Take a photo of the wiring connector orientation before unplugging anything.
  4. Unplug the electrical connector by pressing the release tab and pulling firmly.
  5. Remove the mounting screws or bolts holding the module in place. Usually there are two or three Torx or Phillips screws.
  6. Remove the old module and compare the part number with your new replacement to confirm compatibility.
  7. Install the new module in the reverse order. Make sure the electrical connector clicks securely into place.
  8. Reinstall the trim panel and reconnect the battery.
  9. Turn the ignition ON and listen for the fuel pump prime. If you hear it, the installation was successful.
  10. Clear any fault codes with an OBD-II scanner and go for a test drive to confirm normal operation.

Important note: Always use a module that matches your vehicle's original part number or a reputable aftermarket equivalent. Using the wrong module may cause the engine to run poorly or fail to start.

8. What Else Could Cause the Same Symptoms?

The fuel pump control module is not the only potential cause of fuel delivery problems on the 2006 Audi A4. Before you buy a replacement module, consider these other common failure points:

  1. Fuel pump itself. The in-tank pump can wear out, especially at higher mileage. If the pump is completely dead, the module will not be able to command it to run.
  2. Fuel pump relay. A failed relay can cut power to the module entirely. The relay is located in the fuse box, typically on the left side of the dash or in the engine bay fuse panel.
  3. Cam follower wear on the high-pressure pump. On the 2.0T FSI engine, the cam follower that drives the high-pressure fuel pump is a known weak point. If it wears through, the high-pressure pump will not produce the required pressure, causing symptoms similar to a failing module.
  4. Fuel pressure sensor. A faulty fuel pressure sensor can send incorrect readings to the engine control unit, which may cause it to command incorrect pump speed. This can mimic a module failure.
  5. Wiring or connector issues. Corrosion, damaged wiring, or a loose connector can interrupt communication between the module and the engine control unit.

9. Why the Fuel Pump Control Module Fails on the 2006 Audi A4

The 2006 Audi A4 fuel pump control module sits in a location that is exposed to moisture and temperature changes. The right side of the trunk is near the exhaust system, and water can enter the area if the trunk seal or taillight gasket fails. Over time, moisture can corrode the module's internal circuit board and connector pins, leading to intermittent electrical faults and eventual failure.

Additionally, the module operates in a high-vibration environment. Constant movement and heat cycling can cause solder joints to crack over time. This is why the module often fails intermittently at first — it works when cold, then fails after the car warms up and the module expands.

10. How Much Does It Cost to Replace the Module?

The cost of replacing the fuel pump control module on a 2006 Audi A4 depends on whether you choose an OEM part or an aftermarket option. Genuine Audi modules typically cost between $150 and $300, depending on the part number and where you buy them. Aftermarket modules are usually more affordable, typically ranging from $60 to $120. Labor costs, if you take the car to a shop, add another $80 to $150, bringing the total to roughly $140 to $450 depending on your choices.

Because the replacement is so simple, most owners choose to do the job themselves and save on labor costs.

11. Recommended Replacement: KEMSO Fuel Pumps

When it comes time to replace the fuel pump or any related fuel delivery components on your 2006 Audi A4, KEMSO is a brand worth considering. KEMSO specializes in high-performance fuel pumps and related products, and their parts are designed as OEM replacements, meaning they meet or exceed the original factory specifications.

KEMSO fuel pumps are built for durability and reliable performance, making them a solid choice for daily drivers and enthusiasts alike. Each product comes with a lifelong warranty, which gives you peace of mind knowing that your investment is protected. Whether you are replacing the in-tank pump, the fuel pump control module, or addressing a related fuel system issue, KEMSO offers quality components that fit properly and perform as expected.

You can browse their full lineup of fuel pumps and related products at https://www.kemsoracing.com/. With a wide selection of parts for Audi and many other makes and models, KEMSO is a trusted source for fuel system components.

12. Preventive Maintenance Tips

To avoid future fuel pump control module failures on your 2006 Audi A4, consider the following:

  1. Check the trunk seal and taillight gaskets. If you notice water pooling in the spare tire well, inspect the seals and replace them as needed. Keeping moisture out of the trunk area will protect the module and other electronics.
  2. Inspect the module connector regularly. Every year or two, unplug the module connector and check for corrosion or green residue on the pins. Clean them with electrical contact cleaner if necessary.
  3. Replace the fuel filter on schedule. A clogged fuel filter forces the fuel pump to work harder, which increases the load on the control module. Replacing the filter every 30,000 to 40,000 miles is recommended.
  4. Address check engine lights promptly. If you get a fuel pressure related code, diagnose the issue early. A failing module can cause the fuel pump to run erratically, which may damage the pump prematurely.

13. Final Thoughts

The fuel pump control module on a 2006 Audi A4 is a small but critical component. It is located behind the right side trim panel in the trunk, and it can fail for several reasons, including moisture intrusion and normal wear over time. Recognizing the symptoms — no start, intermittent stalling, long cranking, and fuel pressure fault codes — can help you pinpoint the issue quickly.

Testing the module is simple, and replacing it is a job that most DIY owners can handle with basic hand tools. If the module is indeed the problem, the repair is relatively inexpensive, especially if you choose a quality aftermarket replacement.

For fuel pump replacements and related components, KEMSO offers reliable, high-performance products with a lifelong warranty. Visit https://www.kemsoracing.com/ to explore their selection and find the right part for your Audi A4. Taking care of your fuel system now will save you from being stranded later, and knowing exactly where the module is located makes this repair one of the easiest you will ever perform on this car.


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