If your 2012 Chevrolet Impala is experiencing frustrating issues like stalling, hesitation during acceleration, or a complete no-start condition, a failing Fuel System Control Module (FSCM) is a very common cause. I’ve seen it countless times in my 20+ years in the shop: a vehicle comes in with fuel delivery problems, and the owner has already replaced the fuel pump to no avail. The real culprit is often this small but critical electronic module.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a genuine GM module, part number 20850927, and pre-program it with the very latest GM software updates specifically for your vehicle’s VIN. This means you get a part that performs correctly right out of the box, with no need for an expensive trip to the dealership for programming. This is the most reliable way to restore proper fuel pressure control and get your car running smoothly again.
Common Signs of a Failing FSCM
- ✔ Engine stalls unexpectedly, especially under load.
- ✔ Vehicle cranks but refuses to start.
- ✔ Reduced engine power and poor acceleration.
- ✔ Check Engine Light with diagnostic trouble codes (DTCs) like P069E, P0230, or U0109 (Loss of Communication with Fuel Pump Control Module).
- ✔ Inconsistent fuel gauge readings or a fuel pump that seems to run continuously.
Case Study: The Ghost in the Fuel System
A customer brought in a 2011 Silverado with a classic no-start complaint. They had already replaced the in-tank fuel pump themselves, but the truck still wouldn’t fire up. A quick scan showed DTC U0109. Instead of digging into the wiring harness for hours, experience pointed me straight to the FSCM mounted on the frame rail. These modules live a hard life, exposed to water, salt, and vibrations, which leads to internal corrosion and failure. We installed one of our VIN-programmed modules, and the truck started on the first crank. The customer saved hundreds on diagnostic time and the cost of a new pump they didn’t need.
A Straightforward Guide to Installation
For the 2012 Impala, this is a job most DIYers can handle with basic tools. The module is located inside the trunk, behind the trim on the passenger (RH) side rear quarter panel.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electrical components.
- Access the Module: Open the trunk and remove the clips or fasteners holding the carpeted trim panel on the right side to expose the module.
- Disconnect and Remove: Carefully unplug the electrical connector(s) from the old FSCM. Then, remove the nuts or bolts securing it to the vehicle body.
- Install the New Module: Mount your new, pre-programmed FSCM in the same location and secure it with the original hardware. Reconnect the electrical plug(s), ensuring they click firmly into place.
- Final Steps: Reinstall the trunk trim panel and reconnect the negative battery terminal. The vehicle is now ready to start with no further programming required.
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 vehicle is on this list. Important: After purchase, you must provide your VIN so we can program the module correctly.
ACADIA 10-12 (rear crossmember)
AVALANCHE 1500 10-12 (LH frame rail)
CANYON 10-12 (rear center frame)
CAPTIVA SPORT 12 (LH rear compartment)
COLORADO 10-12 (rear center frame)
CTS 10-12 (LH rear compartment)
ENCLAVE 10-12 (rear crossmember)
ESCALADE / ESV / EXT 10-12 (LH frame rail)
EXPRESS 1500 VAN 10-12 (LH frame rail)
HUMMER H3 10 (rear frame)
LACROSSE 10-12 (RH rear trunk)
OUTLOOK 10 (Fuel Pump)
REGAL 11-12 (LH rear quarter interior)
SAVANA 1500 VAN 10-12 (LH frame rail)
SIERRA 1500 / DENALI 1500 10-12 (LH frame rail)
SILVERADO 1500 PICKUP 10-12 (LH frame rail)
SUBURBAN 1500 10-12 (LH frame rail)
TAHOE 10-12 (LH frame rail)
TRAVERSE 10-12 (rear crossmember)
VUE 10 (RH rear engine compartment)
YUKON / YUKON XL 1500 10-12 (LH frame rail)
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive this information.
Is any additional programming needed after installation?
No. This module arrives fully programmed with the latest GM software matched to your VIN. It is a true plug-and-play installation, saving you a trip to the dealer.
What if I have a different part number on my old module?
This FSCM is a direct replacement for part numbers 20791901, 20827745, and 20877116 in addition to 20850927. As long as your vehicle is on the compatibility list, this module will work correctly.
Where is the FSCM located on my GM truck or SUV?
On most GM trucks and large SUVs from this era (Silverado, Sierra, Tahoe, Yukon), the FSCM is mounted on the driver’s side (LH) frame rail, typically near the spare tire. It is exposed to the elements, which is a primary cause of failure.
Will this fix my P069E check engine light code?
DTC P069E (Fuel Pump Control Module Commanded On) is a very strong indicator of a failing FSCM. While you should always perform a complete diagnosis, replacing the FSCM with this pre-programmed unit is the most common and effective repair for this code.