Restore Your Cadillac’s Performance and Reliability
Is your 2010-2012 Cadillac CTS experiencing frustrating issues like stalling, hesitation on acceleration, or a dreaded no-start condition? Before you suspect the fuel pump, the real culprit is often its electronic brain: the Fuel System Control Module (FSCM). This critical component regulates the voltage sent to your fuel pump, ensuring your engine gets the precise amount of fuel it needs. When it fails, it can leave you stranded. As a technician with over 20 years of experience, I’ve seen countless fuel delivery problems traced back to a faulty FSCM.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the biggest headache out of the repair by pre-programming this module to your vehicle’s specific VIN with the latest GM software updates. This means you can skip the expensive trip to the dealership for programming. Just provide your VIN at checkout, and we’ll handle the rest, shipping you a part that’s truly plug-and-play.
Case Study: A Tricky Diagnosis
A 2011 Cadillac CTS was brought into my bay with a classic complaint: it would randomly stall at red lights and sometimes refuse to restart for several minutes. The owner had already replaced the fuel pump, but the problem persisted. A quick scan revealed DTC P069E – Fuel Pump Control Module Requested MIL Illumination. Instead of just throwing more parts at it, we checked the FSCM. We found corrosion on the connector pins, a common issue for these modules. By replacing it with a properly programmed unit like this one, we resolved the stalling issue permanently, saving the customer from further unnecessary repairs and diagnostic fees. This highlights why addressing the CTS Fuel System Control Module first is often the correct diagnostic path.
Is Your Cadillac Showing These Symptoms?
- ✔ Engine cranks but won’t start
- ✔ Stalling, especially under load or at idle
- ✔ Vehicle hesitates or sputters during acceleration
- ✔ Noticeable decrease in fuel economy
- ✔ Check Engine Light is on with fuel-related codes
- ✔ Common Diagnostic Trouble Codes (DTCs): P069E, P0230, P025A, U0109 (Lost Communication with FSCM)
A Straightforward Guide to Installation
Installing your new CTS Fuel System Control Module is a manageable job for a confident DIYer. On the 2010-2012 CTS, the module is located in the left-hand (driver’s side) rear compartment of the trunk.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Access the Module: Open the trunk and remove the left-side trim panel or access cover to expose the module. It’s a small black box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note their orientation. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed FSCM into place. Reconnect the electrical connectors securely.
- Final Steps: Reinstall the trunk trim panel. Reconnect the negative battery terminal. Your vehicle is now ready to start with its properly functioning fuel system. No programming required!
Verified Vehicle Compatibility
This module, part number 20850927, is a direct replacement for part numbers 20791901, 20827745, and 20877116. It fits a wide range of GM vehicles. Please verify your model and location below:
- Cadillac CTS: 2010-2012 (LH rear compartment)
- Cadillac Escalade, ESV, EXT: 2010-2012 (LH frame rail)
- Chevrolet Avalanche 1500: 2010-2012 (LH frame rail)
- Chevrolet Colorado / GMC Canyon: 2010-2012 (Rear center frame)
- Chevrolet Express 1500 / GMC Savana 1500 Van: 2010-2012 (LH frame rail)
- Chevrolet Silverado 1500 / GMC Sierra 1500: 2010-2012 (LH frame rail)
- Chevrolet Suburban 1500 / GMC Yukon XL 1500: 2010-2012 (LH frame rail)
- Chevrolet Tahoe / GMC Yukon: 2010-2012 (LH frame rail)
- Buick Enclave / GMC Acadia / Chevrolet Traverse / Saturn Outlook: 2010-2012 (Rear crossmember)
- And many more GM models. Please use the compatibility chart to confirm your specific vehicle.
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) allows us to program the module with the exact software and calibrations for your specific vehicle. This ensures perfect compatibility and function right out of the box, eliminating the need for a dealership visit.
Is this part difficult to install?
For the Cadillac CTS, installation is straightforward for someone with basic mechanical skills. It’s located in the trunk and requires simple hand tools. Our guide above provides the key steps. For truck models, it’s typically on the frame rail and is also very accessible.
What happens if I install a module that isn’t programmed?
An unprogrammed module will not work correctly. Your vehicle will likely not start, or it will run very poorly and set multiple error codes. Our pre-programming service solves this entire problem for you.
How do I know my FSCM is bad and not my fuel pump?
While symptoms can be similar, a key indicator is a loss of communication code like U0109 or a specific FSCM performance code like P069E. In my experience, the FSCM is a more common failure point on these GM models than the fuel pump itself.
Is this compatible with other part numbers?
Yes, this module is a direct, interchangeable replacement for GM part numbers 20791901, 20827745, 20877116, and 20850927.