Is your 2012 Impala or other GM vehicle suddenly stalling, hesitating on acceleration, or refusing to start? Before you condemn the fuel pump, the real culprit is often a failed Fuel System Control Module (FSCM). As a technician with over 20 years of experience, I’ve seen this exact scenario play out countless times. The FSCM is the brain that tells your fuel pump how much pressure to deliver. When it fails, your engine is starved of fuel, leading to a host of frustrating and potentially dangerous driving issues.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the hassle and high cost out of the repair by pre-programming this module to your vehicle’s specific VIN before it ships. No expensive trip to the dealership for programming is required. Simply provide us with your VIN after purchase, and we’ll handle the rest, loading the latest GM software updates for optimal performance and reliability. This ensures perfect communication between the module and your vehicle’s computer systems, just like the original.
Is Your Vehicle Showing These Telltale Signs?
- ✔ Engine cranks but won’t start
- ✔ Stalling, especially under load or when coming to a stop
- ✔ Severe hesitation or sputtering during acceleration
- ✔ Reduced engine power and poor fuel economy
- ✔ Check Engine Light with codes like P069E, U0109, or P0230
- ✔ A “Service Fuel System” message on the dash
Case Study: A Tricky Diagnosis
I remember a 2011 Silverado that came into my shop on a tow truck. The owner had already spent a fortune replacing the in-tank fuel pump himself, but the truck still wouldn’t start. He was convinced he got a bad pump. After a quick scan, I saw the classic U0109 code—Lost Communication With Fuel Pump Control Module. We checked the wiring and found it was perfect. The issue was the FSCM, which is mounted on the frame rail and exposed to years of road salt and moisture. We installed a VIN-programmed module, and the truck fired right up. This simple part saved him from another expensive, unnecessary repair and got him back to work.
A Straightforward Guide to Your FSCM Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the Module: On a 2012 Impala, the FSCM is typically found in the trunk area, behind the trim on the right-hand (passenger) side quarter panel. On trucks and SUVs, it’s usually mounted on the driver’s side frame rail.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. Note their orientation. Then, unbolt the old module from its mounting location.
- ✔ Install the New Module: Bolt your new, pre-programmed FSCM into place. Reconnect the electrical connectors securely.
- ✔ Final Steps: Reconnect the negative battery terminal. Turn the key to the ‘On’ position for 10-15 seconds before starting to allow the system to prime. Start the vehicle and check for proper operation.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 20791901, 20827745, 20877116, and 20850927. It fits a wide range of GM vehicles. Please verify your model and year below:
- Buick: Enclave (10-12), LaCrosse (10-12), Regal (11-12)
- 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: For some 2012 truck models, fitment depends on whether the vehicle has an integrated trailer brake controller. Please check your specific application.
Frequently Asked Questions
What is a Fuel System Control Module (FSCM)?
The FSCM, sometimes called a fuel pump driver module, is a small computer that controls the voltage sent to your vehicle’s electric fuel pump. This allows it to precisely regulate fuel pressure for optimal engine performance and efficiency.
Why does this module need to be programmed?
Modern vehicles use a CAN bus network for modules to communicate. Programming the FSCM with your vehicle’s unique VIN ensures it can talk to the Engine Control Module (ECM) and other systems correctly, preventing communication errors and running issues.
How do I provide my VIN number?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We will program the module before shipping it to you.
Is this part new or used?
This is a high-quality, tested used OEM part that has been inspected and prepared for immediate installation in your vehicle.
My old part number is 20877116. Will this one work?
Yes. This module, part number 20791901, is fully compatible and interchangeable with part numbers 20827745, 20877116, and 20850927. We program it to ensure it functions perfectly for your specific vehicle.
Do I need any special tools for installation?
No special tools are required. Basic hand tools like a socket set and a screwdriver are typically all you need to access and replace the module.