Restore Peak Performance to Your Buick Lucerne
If you’re dealing with frustrating issues like engine stalling, a persistent Check Engine Light, or a car that refuses to start, a failing Engine Control Module (ECM) is often the culprit. As the brain of your vehicle’s engine, the ECM controls everything from fuel mixture and ignition timing to transmission shifting. When it fails, it can cause a cascade of problems that leave you stranded. This isn’t just an inconvenience; it’s a critical component for your vehicle’s reliability and safety.
This is a direct-fit replacement Engine Control Module for your 2009-2011 Buick Lucerne with the 4.6L engine. The best part? We handle the programming for you. Simply provide your vehicle’s VIN at checkout, and our technicians will flash the module with the latest, most stable software updates from GM. This means it arrives at your door ready for installation, saving you a costly trip to the dealership and the hassle of finding a shop with the right programming equipment. You get a reliable fix that restores your vehicle’s original performance and efficiency.
Case Study: A Tricky Diagnosis
I remember a 2010 Lucerne that came into my shop with a complaint of intermittent stalling at stoplights. The owner had already replaced the spark plugs and an O2 sensor with no luck. No hard fault codes were stored, just a history of a P0606 (ECM/PCM Processor Fault). After running a full diagnostic, we noticed the live data stream for the fuel injectors would momentarily drop out right before a stall. This pointed directly to an internal failure in the ECM’s processing. We installed a VIN-programmed module just like this one, and the car ran perfectly. It’s a classic example of how a faulty 2009-2011 Lucerne ECM can create phantom issues that are tough to pin down without experience.
Is Your Lucerne Showing These Symptoms?
A failing ECM can manifest in many ways. If you’re noticing any of the following, it’s a strong indicator that your module may need replacement:
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606 (Internal Control Module Memory/Processor Faults).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Noticeable decrease in fuel economy.
- ✔ Hesitation or stumbling during acceleration.
- ✔ Automatic transmission shifting erratically or harshly.
- ✔ Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
Replacing the 2009-2011 Lucerne ECM is a manageable job for a confident DIYer. On the Lucerne, it’s conveniently located at the lower part of the air cleaner box. Follow these general steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the ECM: Open the hood and find the air cleaner assembly. The ECM is typically mounted to the bottom or side of this box.
- Access the Module: You will likely need to remove the air cleaner box lid and filter to get clear access to the ECM and its wiring harnesses.
- Disconnect Connectors: 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 ECM: Unbolt the old module from its mounting bracket. Keep the hardware, as you’ll need it for the new unit.
- Install the New ECM: Mount your new, pre-programmed ECM in place and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical connectors back into the new module until they click into place. Reassemble the air cleaner box and reconnect the negative battery terminal.
- Final Steps: Your vehicle may require a security relearn procedure, which can typically be done by cycling the key. Consult your owner’s manual or a reliable online resource for the specific procedure for your vehicle.
Verified Vehicle Compatibility
This ECM, part number 12628993, is a direct replacement for a wide range of GM vehicles. While this listing is focused on the 2009-2011 Lucerne ECM, it is also interchangeable with the following part numbers: 12636659, 12639300, 1263605, 12628911, 12625453, 12622175, 12630464, and 12678512. It fits these specific models and options:
CADILLAC CTS 09 (RH front engine compartment), 6.2L
CADILLAC DTS 09-11
CADILLAC SRX 09 (LH engine compartment), (4.6L)
CADILLAC STS 09 (LH frame rail), 4.4L or 4.6L
CADILLAC STS 10 (LH frame rail), (4.6L)
CADILLAC XLR 09 (RH front engine compartment), ID 12625453 or 12636659
CHEVROLET COLORADO 09 (RH firewall)
CHEVROLET COLORADO 10-12 (RH firewall), 2.9L or 3.7L
CHEVROLET CORVETTE 09 (RH engine compartment), ZR1
CHEVROLET TRAILBLAZER 09 (LH engine), 6.0L
GMC CANYON 09 (RH firewall)
GMC CANYON 10-12 (RH firewall), 2.9L or 3.7L
GMC ENVOY 09 (LH engine), 5.3L
HUMMER H3 09-10 (RH firewall)
SAAB 9-7X 09 (LH engine)
Frequently Asked Questions
Do I need to do any programming after I install it?
No. We flash the module with the latest GM software using the VIN you provide before shipping. In most cases, it is a plug-and-play installation, though some vehicles may require a simple key-cycle security relearn procedure.
How do I provide my VIN?
Please enter your 17-digit Vehicle Identification Number (VIN) in the designated box on the checkout page. We cannot process your order without it.
Is this a used part?
This is a high-quality, tested, and verified recycled OEM part. Each unit is inspected and programmed to ensure it meets or exceeds original factory performance standards.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal ECM failure (like codes P0601-P0606), this part will resolve the issue. However, if the light is on for other reasons (e.g., a bad sensor), you will still need to diagnose and repair that separate problem.
What if I order the wrong part?
By providing your VIN, we guarantee fitment for the vehicles listed. Our team verifies compatibility before programming and shipping to prevent errors and ensure you get the right part the first time.