Is your 2010, 2011, or 2012 Buick LaCrosse experiencing frustrating issues like stalling, hesitation during acceleration, or a dreaded no-start condition? Before you spend a fortune replacing the entire fuel pump, the real culprit is often this small but critical component: the Fuel System Control Module (FSCM). As a technician with over two decades of experience, I’ve seen countless vehicle owners and even other shops misdiagnose these symptoms. This module is the brain behind your fuel pump, and when it fails, it can mimic a bad pump perfectly.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and extra cost out of the repair by pre-programming this module to your vehicle’s specific Vehicle Identification Number (VIN). This means it arrives at your door with the latest GM software updates, ready for a true plug-and-play installation. No need for an expensive trip to the dealership for programming—you can get your car back to running smoothly and reliably right in your own garage.
Case Study: A Tricky Diagnosis
A customer brought in their 2011 LaCrosse that would crank but not start intermittently. Another shop had already quoted them over $900 for a new fuel pump assembly. When I hooked up my scan tool, I saw the code P069E – Fuel Pump Control Module Requested MIL Illumination. Instead of just throwing a pump at it, I checked the FSCM, which on the LaCrosse is conveniently located in the trunk. I found signs of corrosion on the connector. We replaced it with one of our pre-programmed modules, and the car fired right up. It was a 20-minute fix that saved the customer nearly $700. This is a classic example of why proper diagnosis is key, and why this module is often the correct fix.
Common Signs of a Failing FSCM
If your vehicle is showing any of these symptoms, a faulty FSCM is a likely cause. A failing module can leave you stranded, so addressing it promptly is crucial for safety and reliability.
- ✔ Engine cranks but refuses to start.
- ✔ Vehicle stalls unexpectedly, especially under load or when warm.
- ✔ Noticeable hesitation or stumbling during acceleration.
- ✔ ‘Reduced Engine Power’ message displayed on the dashboard.
- ✔ An active Check Engine Light with codes such as P069E, P025A, P0230, or U0109 (Lost Communication With Fuel Pump Control Module).
A Straightforward Guide to Installation
Installing your new 2010-2012 LaCrosse FSCM is a simple process. For the Buick LaCrosse, the module is located in the right-hand side of the trunk, behind the liner.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Access the Module: Open the trunk and pull back the carpeted liner on the passenger side to expose the FSCM. It’s a small black box mounted to the vehicle body.
- Disconnect and Remove: Carefully unplug the electrical connector(s) from the old module. Then, unbolt the module from its mounting bracket. Typically, this requires only a small socket or wrench.
- Install the New Module: Mount your new, pre-programmed FSCM onto the bracket and tighten the bolts. Reconnect the electrical harness, ensuring it clicks securely into place.
- Final Steps: Re-install the trunk liner and reconnect the negative battery terminal. Start the vehicle to confirm the repair is complete and the symptoms are gone.
Will This Fit My Vehicle?
This module is a direct-fit replacement for a wide range of General Motors vehicles. While this listing is focused on the 2010-2012 LaCrosse FSCM, it is also compatible with the following models. Please verify your part number (20791901, 20827745, 20877116, or 20850927) to ensure perfect compatibility.
- ✔ Buick LaCrosse: 2010-2012 (Located in RH rear trunk)
- ✔ Cadillac CTS / Escalade / ESV / EXT: 2010-2012
- ✔ Chevrolet Avalanche / Silverado / Suburban / Tahoe: 2010-2012
- ✔ Chevrolet Colorado / Captiva Sport / Impala: 2010-2012
- ✔ GMC Acadia / Canyon / Sierra / Yukon / Yukon XL: 2010-2012
- ✔ And many other GM models, including Enclave, Traverse, Savana, and Hummer H3.
Frequently Asked Questions
Do I need to do any programming after I receive it?
No. This module arrives 100% plug-and-play. We flash it with the latest GM software calibrated specifically to your vehicle’s VIN before we ship it.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship the module until we receive your VIN for programming.
Is this the same as a fuel pump driver module?
Yes. Fuel System Control Module (FSCM) and Fuel Pump Driver Module (FPDM) are different names for the same part that controls the voltage sent to the fuel pump.
What if my original part number is 20877116?
This module is a direct replacement for part numbers 20791901, 20827745, 20877116, and 20850927. As long as your vehicle is on the compatibility list, this part will work perfectly.
Could a bad FSCM drain my battery?
In some cases, yes. A faulty module can fail to shut down correctly when the vehicle is off, causing the fuel pump to run continuously or creating a parasitic draw that drains the battery overnight.