Restore Your LaCrosse’s Performance and Reliability
Is your 2010-2012 Buick LaCrosse suddenly stalling, struggling to start, or showing a ‘Service StabiliTrak’ message alongside a check engine light? 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 isn’t just a part; it’s the solution to a frustrating and common problem.
This FSCM, also known as a fuel pump driver module, is the brain that tells your fuel pump how much pressure to deliver. When it fails, communication is lost, leading to erratic fuel supply, poor performance, and eventually, a car that won’t start. We solve the biggest headache of this repair by pre-programming the module to your vehicle’s specific VIN before we ship it. This means no expensive trip to the dealership for programming. It arrives at your door ready for a true plug-and-play installation.
From the Diagnostic Bay: The LaCrosse That Baffled Everyone
A customer brought in their 2011 LaCrosse with a classic complaint: it would run fine for a while, then suddenly lose power and stall at a stoplight. Two other shops had already quoted them for a full fuel pump assembly replacement, a costly and invasive job. When I hooked up my scanner, I saw the tell-tale code: U0109 – Lost Communication With Fuel Pump Control Module. Instead of jumping to the pump, I checked the FSCM. These modules, especially on GM vehicles of this era, are notorious for internal failure due to heat and vibration. We swapped in a VIN-programmed module, and the car ran perfectly. This simple part saved the customer over $700 and hours of unnecessary labor. That’s the kind of smart, targeted repair we provide.
Is Your Vehicle Showing These Symptoms?
A failing FSCM can mimic a bad fuel pump. If you’re experiencing any of the following, this module is the most likely solution for your 2010-2012 LaCrosse Fuel Module issues:
- âś” Engine cranks but refuses to start
- âś” Sudden stalling, especially when warm or at idle
- âś” Hesitation or stumbling during acceleration
- âś” Reduced engine power or ‘limp mode’
- âś” Check Engine Light with codes like P069E, P0230, or U0109
- âś” An audible fuel pump that isn’t running when the key is turned
A Straightforward Guide to Installation
Replacing the FSCM on your LaCrosse is a job most DIYers can handle in their own garage. Because we pre-program it, you won’t need any special electronic tools. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts.
- Access the Module: On the 2010-2012 LaCrosse, the FSCM is conveniently located in the trunk on the right-hand (passenger) side, behind the trunk liner. You may need to remove a few plastic clips or panels to gain access.
- Disconnect and Remove: Carefully unplug the electrical connector(s) from the old module. Then, unbolt the module from its mounting point. It’s typically held on by one or two small bolts or nuts.
- Install the New Module: Bolt the new, pre-programmed module into place. Reconnect the electrical connector, ensuring it clicks securely into place.
- Reassemble and Test: Put the trunk liner and any panels back. Reconnect the negative battery terminal. Turn the key to the ‘On’ position for a few seconds to allow the system to prime, then start the engine. Your fuel delivery issues should be resolved.
Verified Vehicle Compatibility
While this is the correct 2010-2012 LaCrosse Fuel Module, it also fits a wide range of other General Motors cars, trucks, and SUVs. Please verify your vehicle and part number below. This module is a direct replacement for part numbers 20791901, 20827745, 20877116, and 20850927.
Cadillac: CTS (10-12), Escalade / ESV / EXT (10-12)
Chevrolet: Avalanche 1500 (10-12), Captiva Sport (12), Colorado (10-12), Express 1500 Van (10-12), Impala (12), Silverado 1500 (10-12), Suburban 1500 (10-12), Tahoe (10-12), Traverse (10-12)
GMC: Acadia (10-12), Canyon (10-12), Savana 1500 Van (10-12), Sierra 1500 / Denali 1500 (10-12), Yukon / Yukon XL 1500 (10-12)
Hummer: H3 (10)
Saturn: Outlook (10), Vue (10)
Note: Some models have specific options (e.g., w/o integrated trailer brake control). Please match your part number or contact us with your VIN to confirm.
Frequently Asked Questions
Why do you need my VIN?
Your vehicle’s VIN allows us to load the exact, most current GM factory software for your specific car. This makes the module a true plug-and-play part, saving you a trip to the dealer for expensive programming.
Is this installation difficult for a DIYer?
Not at all. For the LaCrosse, the module is easily accessible in the trunk. With basic hand tools and our pre-programmed module, most people can complete the job in under 30 minutes.
Will this fix a check engine light with code P069E or U0109?
Yes. Codes P069E (Fuel Pump Control Module Performance) and U0109 (Lost Communication With FSCM) are the most common indicators of a failed module. This part is the direct solution for those diagnostic trouble codes.
What is the difference between the FSCM and the fuel pump?
The fuel pump is the mechanical part inside the gas tank that moves fuel. The FSCM is the electronic controller—the ‘brain’—that tells the pump how fast to run to maintain correct fuel pressure. The FSCM often fails before the pump itself.
How do I provide my VIN after purchase?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship your order until we receive the VIN, as programming is a required step to ensure the part works correctly in your vehicle.