Infiniti Q50 3.7 Fuel Pump Control Module: Complete Guide to Diagnosis, Replacement, and Cost

The Infiniti Q50 3.7 fuel pump control module (FPCM) is a critical electronic component that regulates fuel delivery to your engine. If your Q50 with the 3.7L VQ37VHR engine experiences no-start conditions, intermittent stalling, or hesitation under load, the fuel pump control module is often the culprit. Replacing this module restores proper fuel pressure and prevents costly engine damage.

The fuel pump control module, also known as the fuel pump driver module or FPDM, acts as the brain for your fuel system. It receives signals from the engine control unit (ECU) and adjusts the fuel pump's operation to deliver the right amount of fuel at the right pressure. When this module fails, your fuel pump may not receive power, or it may run erratically, leading to drivability problems that can leave you stranded.

What Is the Infiniti Q50 3.7 Fuel Pump Control Module?

The fuel pump control module is an electronic device mounted in or near the fuel tank area. For the 2014-2015 Infiniti Q50 with the 3.7L VQ37VHR engine, the OEM part number is 17001-4GB0A. This module is also referred to as a "Control Module Kit-Fuel Pump" or "MODULATOR-Fuel Pump Control".

The module's job is straightforward: it controls the fuel pump's speed and pressure based on engine demand. It uses pulse-width modulation (PWM) to vary the pump's electrical current, which allows the pump to run slower during idle and faster during acceleration. This precise control improves fuel efficiency, reduces wear on the fuel pump, and ensures consistent fuel delivery.

For 2016-2019 Infiniti Q50 models with the 3.0L VR30 engine, a different module (part number 17001-5AA0A) is used, so it is essential to verify compatibility before purchasing. The 2014-2015 3.7L models use the 17001-4GB0A module exclusively.

Symptoms of a Failing Fuel Pump Control Module in Your Q50

Recognizing the signs of a failing FPCM early can save you from breakdowns and expensive repairs. Here are the most common symptoms:

1. No-Start Condition with Cranking Engine

The most obvious sign is an engine that cranks but will not start. You turn the key, the starter motor engages, but the engine never fires. If you listen closely, you should hear a brief whirring sound from the rear of the car when you turn the ignition to the "ON" position—this is the fuel pump priming. If you do not hear this sound, the fuel pump control module may not be sending power to the pump.

2. Intermittent Starting and Stalling

Some owners report that their Q50 starts fine some days but refuses to start on others. Or the car starts, runs for a few minutes, then stalls without warning. This intermittent behavior often points to an FPCM that is failing due to heat stress. The module's internal circuits may work when cold but fail once they heat up.

3. Hesitation and Power Loss Under Acceleration

If your Q50 feels sluggish when you press the gas pedal, or if it hesitates during hard acceleration, the fuel pump control module may be delivering inconsistent fuel pressure. The engine may momentarily run lean, causing a noticeable loss of power.

4. Check Engine Light with Fuel Pump Codes

A diagnostic scan tool will often reveal codes related to the fuel pump control module or fuel pump circuit. Common codes include P0087 (Fuel Rail/System Pressure Too Low), P0230 (Fuel Pump Primary Circuit Malfunction), or P0231 (Fuel Pump Secondary Circuit Low Voltage). These codes should not be ignored, as they confirm that the module or its wiring is failing.

5. Continuous Fuel Pump Operation

In some cases, a failing module may cause the fuel pump to run constantly, even when the engine is off. This drains the battery and can damage the pump. You may hear a continuous hum from the fuel tank area.

6. Visible Damage or Burning Smell

If you inspect the module and notice corrosion, burn marks, or melted connectors, the module has failed internally. A burning smell near the rear seat area or fuel tank is also a red flag.

Diagnosing the Fuel Pump Control Module: Step-by-Step

Before replacing the module, it is essential to confirm that the module itself is the problem and not the fuel pump, wiring, fuses, or relay. Here is a systematic approach:

Step 1: Check Basic Electrical Connections
Ensure the FPCM connectors are fully seated and locked. Inspect for bent pins, corrosion, or loose terminals. Make sure the module is mounted correctly and the harness is not under tension.

Step 2: Verify Battery Voltage and Grounds
A healthy battery is critical for the FPCM to function. Clean and tighten battery terminals, and check main chassis and engine grounds. Low system voltage can prevent the module from enabling the fuel pump.

Step 3: Check Fuses and Relays
Locate the fuel pump fuse and relay in the under-hood fuse box. Remove the fuse and inspect it for a broken element. Swap the fuel pump relay with a known good relay of the same rating to test it. If a fuse blows again immediately, there is a short circuit in the wiring or the pump itself.

Step 4: Verify Fuel Pressure
Do not guess—measure actual fuel pressure using a fuel pressure gauge connected to the service port on the fuel rail. During cranking, you should see pressure in the range of 50-60 psi. If pressure is zero or very low, and power and ground are confirmed, the pump or module is likely at fault.

Step 5: Scan for Diagnostic Trouble Codes
Use a professional-grade scan tool to read codes from the ECU and any fuel-related modules. Generic OBD2 readers may not capture all codes. Note any immobilizer, crank/cam sensor, or throttle faults, as these can cause no-start conditions even with good fuel pressure.

Step 6: Listen for Fuel Pump Prime
Turn the ignition to the "ON" position without starting the engine. Listen for a 2-3 second whirring sound from the rear of the car. If the pump does not prime, and power and ground are good at the module, the module is likely faulty.

Infiniti Q50 3.7 Fuel Pump Control Module Replacement Cost

The cost to replace a fuel pump control module on a 2014-2015 Infiniti Q50 3.7 varies depending on where you have the work done and whether you choose an OEM or aftermarket part.

OEM Part Cost: The genuine Infiniti fuel pump control module (17001-4GB0A) typically costs between $250 and $400 for the part alone. Dealership parts departments and online OEM retailers list this part at varying prices.

Aftermarket Part Cost: Quality aftermarket modules can cost between $80 and $200, offering significant savings over OEM parts.

Labor Cost: If a professional mechanic performs the replacement, labor typically adds $100 to $250 depending on the shop's hourly rate and the module's location. Some modules are easier to access than others.

Total Replacement Cost: At an independent shop, expect to pay $300 to $500 total. At a dealership, the same job can reach $400 to $650.

DIY Savings: A confident DIYer with basic tools can save $200-$400 in labor. The module is usually accessible under the rear seat or near the fuel tank, and replacement involves disconnecting the electrical connector, removing a few bolts, and installing the new module. However, working with fuel system components requires caution, and mistakes can cause leaks or electrical issues.

Is There a Recall for the Infiniti Q50 Fuel Pump Control Module?

Yes, Infiniti issued a voluntary safety recall campaign (number R1717) for certain 2016-2018 Infiniti Q50 and 2017-2018 Infiniti Q60 vehicles equipped with the 2.0L turbo engine. This recall involves reprogramming the fuel pump control module to prevent a potential loss of power condition.

Important: This recall does not apply to the 2014-2015 Infiniti Q50 with the 3.7L VQ37VHR engine. If you own a 3.7L Q50, there is no recall-related remedy from Infiniti, and you will need to pay for any necessary repairs out of pocket unless your vehicle is still under warranty.

However, Infiniti recommends that all Q50 owners check their vehicle identification number (VIN) with an authorized Infiniti dealer to confirm whether any open campaigns apply to their specific vehicle. Recalls and service campaigns can be added over time.

Where Is the Fuel Pump Control Module Located?

On the 2014-2015 Infiniti Q50 3.7, the fuel pump control module is typically located in one of two places:

Under the Rear Seat: Remove the rear seat bottom cushion by pulling up firmly on the front edge. You will see a metal access cover. Remove the cover to reveal the fuel pump module and the control module mounted nearby.

Inside the Fuel Tank Assembly: In some configurations, the control module is integrated into the fuel pump module assembly itself and is not serviceable separately. In this case, you must replace the entire fuel pump module assembly.

Near the Fuel Tank: On some models, the module is mounted externally on the chassis near the fuel tank, making it easier to access without removing the seat.

Check your vehicle's service manual or consult an Infiniti parts specialist to confirm the exact location for your specific VIN.

Can You Drive with a Bad Fuel Pump Control Module?

Driving with a failing fuel pump control module is not recommended. The module may cause intermittent stalling, which can be dangerous in traffic. Additionally, if the module fails completely, the engine will not start at all, leaving you stranded. Continued driving with a faulty module can also damage the fuel pump by causing it to run dry or overheat.

If you suspect your module is failing, have it diagnosed and replaced as soon as possible to avoid being stranded and to prevent additional damage to your fuel system.

Why Choose KEMSO for Your Infiniti Q50 Fuel Pump Needs

When it comes to replacing your fuel pump or fuel pump control module, choosing a reliable brand makes all the difference. KEMSO offers high-performance fuel pumps designed as direct OEM replacements for the Infiniti Q50 3.7L engine. Their pumps are built to handle applications up to 700-800 horsepower, making them ideal for both daily drivers and performance builds.

KEMSO fuel pumps feature a 340 liters-per-hour flow rate at 43 psi, which exceeds the stock pump's capacity. This means your engine gets consistent fuel delivery even under demanding conditions. Each pump is individually tested for performance and flow, ensuring quality that matches or exceeds OEM specifications.

The KEMSO pump is compatible with both gasoline and E85 ethanol fuels, giving you flexibility for future upgrades. The kit includes everything you need for a complete installation: the pump, gradient density fuel strainers, flex hose, rubber hose, wiring connector, and clamps. This all-in-one package simplifies the replacement process for DIY enthusiasts.

KEMSO stands behind their products with a lifetime warranty, giving you peace of mind that your investment is protected. Their commitment to quality control and customer satisfaction makes them a trusted choice among Infiniti owners.

Visit the KEMSO website today to browse their selection of fuel pumps and related products for your Infiniti Q50:

https://www.kemsoracing.com/

Step-by-Step Guide to Replacing the Fuel Pump Module

If you are comfortable working on your car, replacing the fuel pump module or control module can be done at home with basic tools. Here is a general outline of the process:

Tools You Will Need:

  • 10mm socket and ratchet
  • Trim removal tool
  • Fuel line disconnect tool
  • Lock ring tool (for fuel pump module)
  • Safety glasses and gloves
  • Shop rags and a fire extinguisher

Procedure:

  1. Relieve fuel pressure: Remove the fuel pump fuse or relay from the fuse box. Start the engine and let it run until it stalls. Crank the engine for 3-5 seconds to release remaining pressure.

  2. Disconnect the battery: Remove the negative battery cable to prevent sparks.

  3. Access the module: Remove the rear seat bottom cushion. Locate the access cover on the floor pan and remove it.

  4. Clean the area: Wipe away dirt and debris from around the module to prevent contamination.

  5. Disconnect electrical connectors: Press the locking tab and unplug the wiring harness.

  6. Disconnect fuel lines: Use a fuel line disconnect tool to release the quick-connect fittings. Have rags ready to catch fuel drips.

  7. Remove the lock ring: Use a lock ring tool to turn the retaining ring counterclockwise. Lift the ring off.

  8. Remove the old module: Carefully lift the module straight out, angling it to clear the float arm.

  9. Install the new module: Place the new module in the tank, ensuring the float arm and pump sit correctly. Install the lock ring and tighten it clockwise.

  10. Reconnect everything: Reattach the fuel lines, electrical connectors, and access cover. Reconnect the battery and replace the fuel pump fuse.

  11. Test the system: Turn the ignition to "ON" and listen for the fuel pump to prime. Start the engine and check for leaks.

Frequently Asked Questions About the Infiniti Q50 3.7 Fuel Pump Control Module

Q: Is the fuel pump control module the same as the fuel pump relay?
A: No. The fuel pump relay is a simple switch that provides power to the circuit, while the control module actively regulates pump speed and pressure. They are different components.

Q: Can a bad fuel pump control module damage the fuel pump?
A: Yes. A failing module can cause the pump to run continuously, overheat, and fail prematurely. Conversely, a failing pump can also damage the module by drawing excessive current.

Q: How long does a fuel pump control module last?
A: These modules are designed to last the life of the vehicle, but heat, vibration, and electrical issues can cause premature failure. There is no set lifespan, but many last over 100,000 miles.

Q: Can I use a module from a 3.0L Q50 on my 3.7L Q50?
A: No. The 2014-2015 3.7L models use part number 17001-4GB0A, while 2016+ 3.0L models use 17001-5AA0A. They are not interchangeable.

Q: Will replacing the fuel pump control module fix a no-start issue?
A: Only if the module is confirmed to be faulty. Always diagnose first—check fuses, relays, fuel pressure, and pump operation before replacing the module.

Final Thoughts

The fuel pump control module on your Infiniti Q50 3.7 is a vital component that directly affects engine performance and reliability. If you experience no-start conditions, stalling, or hesitation, diagnosing and replacing this module can restore your car to proper working order.

Whether you choose an OEM Infiniti module or a high-performance aftermarket option from KEMSO, the key is to use a quality part that matches your vehicle's specifications. KEMSO offers an excellent balance of performance, reliability, and value, backed by a lifetime warranty that gives you confidence in your purchase.

Visit https://www.kemsoracing.com/ to find the right fuel pump and control module for your Infiniti Q50. Keeping your fuel system in top condition ensures your Q50 continues to deliver the smooth, powerful driving experience that Infiniti owners have come to expect.


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