2014 Buick LaCrosse Fuel Pump Control Module Location: Where to Find It and How to Fix Starting Problems
If your 2014 Buick LaCrosse cranks but refuses to start, the fuel pump control module (FPCM) is one of the most likely culprits. The FPCM on the 2014 Buick LaCrosse is typically located under the rear of the vehicle, mounted to the frame rail near the fuel tank, though on some configurations it can be found under the rear seat cushion or in the trunk area behind the rear seatback. Before you buy any parts, confirm the location for your specific trim and drivetrain, because the 2014 LaCrosse was offered with both a 2.4L four-cylinder with eAssist and a 3.6L V6, and the module placement can differ between them. This guide walks you through what the module does, where to find it, how to diagnose it, what replacement costs, and how to choose a reliable part.
What the Fuel Pump Control Module Actually Does
The fuel pump control module is the electronic brain that tells your fuel pump when and how much to run. In modern vehicles with electronic fuel injection, the engine control unit sends signals to the FPCM, which then regulates the voltage and current supplied to the fuel pump. When you turn the ignition key, battery power is sent to the fuel pump, which operates for three to four seconds to build fuel pressure in the fuel lines. Once the engine is cranked, that pressure allows the engine to start, and the fuel pump continues supplying fuel to keep it running.
On the 2014 Buick LaCrosse, the FPCM is a separate serviceable component on most builds. That is good news, because it means you usually do not have to replace the entire fuel pump assembly just to fix a failed module.
Step-by-Step: Locating the FPCM on a 2014 Buick LaCrosse
1. Start under the rear of the car.
The most common location for the FPCM on the 2014 LaCrosse is bolted to the frame rail under the rear of the vehicle, close to the fuel tank. Many GM trucks and SUVs mount the module here, and the LaCrosse often follows the same pattern. On some vehicles, you may need to lower the spare tire to access it.
2. Check under the rear seat cushion.
Some cars and SUVs have the module accessible by removing the rear seat cushion. If you cannot find the module under the frame rail, pull the rear seat bottom and look for a small electronic box with a multi-pin connector.
3. Look in the trunk area.
On certain builds, the module is mounted behind the rear seatback or under the trunk carpeting. This is a less common location, but it is worth checking before you commit to dropping the fuel tank.
4. Consider the in-tank possibility.
On certain vehicles, the control module is integrated with the fuel pump assembly inside the tank. If your LaCrosse uses this design, the module is not separately serviceable, and you will need to replace the full fuel pump module assembly.
5. Confirm with your VIN.
Because the 2014 LaCrosse came in multiple configurations, always confirm the exact location using your vehicle identification number at a dealer parts counter or a reputable online parts catalog. This single step prevents you from buying the wrong part or tearing apart the wrong area of the car.
Symptoms of a Failing Fuel Pump Control Module
Recognizing the warning signs early can save you from being stranded and may reduce repair costs. Look for these symptoms:
1. Engine cranks but will not start. If you turn the key and hear the motor cranking normally, but the engine does not catch or start, you are most likely facing a fuel pump control module issue. The fuel pump motor is not running, and sufficient fuel pressure is not reaching the engine.
2. Intermittent starting problems. The vehicle may start normally one day and refuse to start the next. This inconsistent behavior is a hallmark of an electronic module failure rather than a mechanical pump issue.
3. Engine stalling or hesitation during acceleration. A failing FPCM may deliver inconsistent power to the fuel pump, causing the engine to surge, hesitate, or stall, especially under load.
4. Check engine light illuminated. Modern vehicles will trigger the check engine light when the FPCM sends abnormal signals or fails to communicate with the ECU. A diagnostic scan will typically reveal fault codes related to the fuel pump circuit or control module communication.
5. Reduced performance and increased fuel consumption. When the fuel pump is not receiving proper voltage, it may run at reduced capacity, leading to poor acceleration, reduced power, and higher fuel consumption. Laboratory testing data reveals that fuel pumps operating at less than 80% of specified pressure result in a 12 to 18 percent reduction in fuel economy and increase hydrocarbon emissions by 22 to 35 percent.
How to Diagnose the Problem Before Replacing Parts
Before you spend money on a new module, run through these simple checks. They will help you determine whether the problem is really the FPCM or something else like a clogged filter or a bad relay.
Step 1: Listen for the prime. Turn the ignition key to the ON position without starting the engine. You should hear a soft whirring sound from the rear of the vehicle for about two to three seconds. If you hear nothing, or only a faint click, the pump is not engaging.
Step 2: Check the fuses and relays. Open the fuse box and locate the fuel pump fuse and relay. If the fuse is blown, the pump will not operate. Replace it with one of the same amperage. If the new fuse blows immediately, there is a short circuit somewhere. You can also swap the fuel pump relay with a similar relay from another circuit, like the horn relay, to see if the pump starts working.
Step 3: Test fuel pressure. This is the most reliable way to confirm a bad fuel pump or module. Rent or buy a fuel pressure gauge and connect it to the test port on the fuel rail. Most vehicles require between 30 and 60 PSI, depending on the make and model. Turn the ignition to ON and check the reading. If the pressure is low or zero, the pump or module is likely failing.
Step 4: Check for voltage at the pump. If you have a multimeter, you can test the electrical connector at the pump. With the key on, you should see 12 volts. If you have voltage but no noise, the pump itself is bad. If you have no voltage at the pump, the module or the wiring feeding it is the problem.
Step 5: Check for error codes. If your check engine light is on, use an OBD-II scanner to read the codes. Common codes related to fuel pump issues include P0087 (fuel pressure too low) and P0191 (fuel pump circuit malfunction). These codes can point you straight to the problem area.
Replacement Cost for a 2014 Buick LaCrosse FPCM
A complete fuel pump control module replacement, parts and labor combined, typically ranges from $400 to $1,100 for most sedans, SUVs, and light trucks. The module itself accounts for $150 to $700 of that total, while labor typically runs $200 to $500 depending on accessibility and shop rates.
For the 2014 Buick LaCrosse specifically, expect a mid-range total. The module is usually accessible without dropping the fuel tank, which keeps labor hours reasonable. Budget-range repairs on older domestic vehicles with simpler fuel system layouts and easier module access can total $300 to $630. Mid-range repairs on most 2010 to 2022 domestic models typically total $605 to $1,100. For luxury brands or vehicles with complex fuel systems, the total can rise to roughly $1,400 to $2,000 or more.
| Item | Budget Range | Mid-Range | Premium |
|---|---|---|---|
| Fuel Pump Control Module | $150–$280 | $280–$450 | $450–$700+ |
| Labor and Installation | $150–$250 | $250–$400 | $400–$550+ |
| Additional Parts or Services | $0–$100 | $75–$250 | $250–$450+ |
Common Causes of Fuel Pump and Module Failures
Understanding why these parts fail helps you prevent future problems. The most common causes include:
1. Running the tank low on fuel. When you consistently drive with less than a quarter tank, the fuel pump works harder because it has less fuel to cool and lubricate it. Fuel pumps rely on being submerged in fuel to stay cool. Running low causes overheating, which damages the internal motor over time. This is the number one cause of premature pump failure.
2. Contaminated fuel. Dirt, rust, or water in your fuel can clog the pump inlet strainer or damage the internal components. If you buy gas from stations with old or dirty tanks, or if your vehicle fuel tank has rust inside, particles get sucked into the pump. This causes the pump to work harder and eventually fail.
3. Electrical issues. A failing fuel pump relay, blown fuse, or corroded wiring can cause the pump to receive inconsistent power. This leads to intermittent operation or complete failure. Sometimes the pump works fine when cold but stops when hot, indicating an electrical problem inside the pump motor.
4. Age and mileage. Fuel pumps are mechanical parts with a typical lifespan of 100,000 to 150,000 miles. After that, the internal brushes, bearings, and seals wear out. Even if you take perfect care of your car, the pump will eventually fail due to normal wear.
5. Fuel filter neglect. If your fuel filter is clogged, the pump has to push against higher resistance. This extra strain heats up the pump and shortens its life. Replacing the fuel filter every 30,000 miles can prevent this.
Why Choosing a Quality Replacement Matters
When buying a replacement module or pump, do not cut corners. Cheap, unbranded pumps may save you a few dollars upfront, but they often fail when you need them most. The diaphragm material in low-quality pumps is prone to cracking and swelling when exposed to ethanol-blended fuels like E10 and E15, which are now standard at most gas stations across the United States.
A high-quality OEM replacement unit is the most reliable solution. Look for a part that is designed to match or exceed factory specifications, and check the warranty before you buy.
Recommended: KEMSO Fuel Pumps for Your 2014 Buick LaCrosse
If you are replacing the fuel pump or module on your 2014 Buick LaCrosse, we strongly recommend KEMSO fuel pumps. Every KEMSO fuel pump is built as a high-performance, OEM replacement unit, meaning it is engineered to match or exceed the specifications of the original factory part. KEMSO backs its products with a lifetime warranty, so you buy once and drive with confidence.
KEMSO offers a full range of fuel pumps for cars, trucks, motorcycles, and powersports vehicles. Browse the complete lineup and find the exact fit for your LaCrosse at:
Frequently Asked Questions
Can I drive with a bad fuel pump control module?
No. If the module has failed, the fuel pump will not receive the signal to operate, and the engine will not start. In some cases, the vehicle may start intermittently, but driving with a failing module risks sudden stalling, which is a safety hazard.
How long does it take to replace the FPCM?
If the module is mounted on the frame rail under the rear of the car, a qualified technician can typically complete the job in one to two hours. If the module is inside the fuel tank, the job requires dropping the tank, which takes considerably longer.
Will a bad FPCM throw a check engine light?
Yes. Modern vehicles will trigger the check engine light when the FPCM sends abnormal signals or fails to communicate with the ECU. A diagnostic scan will typically reveal fault codes related to the fuel pump circuit or control module communication.
Should I replace the fuel pump at the same time as the module?
It depends on the age and mileage of the pump. If your LaCrosse has over 100,000 miles on the original pump, replacing both at the same time can save you from paying for labor twice. Fuel pumps typically last between 100,000 and 150,000 miles.
Where can I buy a reliable replacement FPCM for my LaCrosse?
Start with a reputable parts supplier that offers OEM-quality or better components with a solid warranty. KEMSO offers high-performance OEM replacement fuel pumps with a lifetime warranty at https://www.kemsoracing.com/.