Is Your Buick Regal Acting Up? Get the Definitive Solution.
If you’re dealing with a frustrating check engine light, erratic engine performance, or a no-start condition in your 2011 Buick Regal, a failing Engine Control Module (ECM) is a very likely culprit. As the brain of your vehicle, when the ECM falters, it can cause a cascade of confusing and costly problems. I’ve seen it countless times in my 20+ years in the shop: owners replace sensor after sensor, only to find the root cause was the computer all along. This isn’t just a replacement part; it’s a permanent fix designed to restore your vehicle’s original performance and reliability.
We take the guesswork and high dealership costs out of the equation. This genuine OEM ECM is meticulously tested and then programmed specifically to your vehicle using your VIN. This means it arrives at your door loaded with the latest GM software updates, ready for a straightforward installation. You get a fully functional, VIN-matched module without ever needing a tow truck or an expensive appointment at the dealer. This is the smart, efficient way to get your car running right again.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 Regal with an intermittent stalling problem that no other shop could solve. It threw no consistent codes, just random communication errors. After checking the main power and ground circuits to the ECM—which is always step one—we noticed a slight voltage drop under load. On a hunch, we connected our diagnostic tool and monitored the 5-volt reference signal while wiggling the ECM connectors. The signal would drop out completely. The internal processor was failing under thermal stress. We installed one of our pre-programmed modules, and the car has run flawlessly for the owner ever since. It’s often not a sensor, but the central processor that’s the real issue.
Common Signs of a Failing ECM
A faulty computer can manifest in many ways. If your vehicle is experiencing any of the following, a new 2011 Regal Engine Control Module could be the answer:
- ✔ Check Engine Light is on with codes like P0601, P0606, or U-series communication codes.
- ✔ Engine cranks but refuses to start.
- ✔ Stalling, stumbling, or hesitation during acceleration.
- ✔ Noticeably poor fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Loss of communication with your scan tool.
- ✔ Other modules (like the TCM or BCM) setting ‘loss of communication with ECM’ codes.
A Straightforward Guide to Installation
Replacing your 2011 Regal Engine Control Module is a job most DIYers can handle with basic tools. Following these steps will ensure a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow all capacitors to discharge.
- Locate the ECM: On the 2011 Regal, the ECM is typically found in the left-hand (driver’s side) of the engine compartment, often near the fuse box or air filter housing.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware that secures the old ECM to its bracket. Remove the module from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: In some cases, a security or crank position sensor relearn procedure may be required. This can often be done with a capable bidirectional scan tool or by following a specific vehicle procedure. Start the engine and check for proper operation.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12650256 and also interchanges with part numbers 12616889, 12630908, 12637106, 12642665, and 12651993. It is guaranteed to fit the following vehicles:
- Buick Allure: 2010 (2.4L, 3.0L)
- Buick LaCrosse: 2010-2011 (2.4L, 3.0L)
- Buick Regal: 2011
- Cadillac CTS: 2010-2012 (3.0L, 3.6L)
- Cadillac SRX: 2010-2011 (3.0L)
- Chevrolet Camaro: 2012 (3.6L)
- Chevrolet Captiva Sport: 2012
- Chevrolet Equinox: 2010-2011
- Chevrolet Impala: 2012
- Chevrolet Orlando: 2012-2013
- GMC Terrain: 2010-2011
- Saab 9-5: 2010-2011 (2.0L)
Do I need to do anything after I buy this?
Do I need to do anything after I buy this?
Yes. After your purchase, you MUST provide us with your vehicle’s 17-digit VIN. We cannot ship your order until we have this information, as we use it to program the module with the correct, updated software for your specific vehicle.
Is this a plug-and-play part?
For most vehicles, yes. Because we pre-program it to your VIN, it eliminates the need for dealer programming. However, some GM vehicles may require a simple security relearn or crankshaft position sensor relearn procedure after installation, which can be done with a compatible scan tool.
How do I find my original part number?
The part number is printed on a sticker on your original ECM. You can match it to 12650256 or any of the other compatible part numbers listed to confirm fitment. Even if your number isn’t listed, as long as your vehicle model and year match our list, this module will work once programmed.
Will this fix my car’s specific problem?
This 2011 Regal Engine Control Module is the solution for issues directly caused by a faulty ECM, such as internal processor failure (P0601), communication errors, or failed driver circuits. While it solves many common problems, you should always ensure your vehicle has been properly diagnosed. Check for good power, grounds, and sensor inputs before condemning the module.