If you’re dealing with frustrating engine problems in your 2006 Buick Lucerne—like a persistent check engine light, erratic performance, or a no-start condition—a failing Engine Control Module (ECM) is often the culprit. As the brain of your vehicle’s engine management system, a faulty ECM can create a cascade of issues that are difficult to diagnose. This isn’t just a replacement part; it’s a comprehensive solution. We provide a reliable ECM, part number 19210737, that comes fully programmed to your vehicle’s specific VIN with the latest GM software updates. This eliminates the need for an expensive trip to the dealership for programming.
Case Study: A Tricky Diagnosis
I remember a 2006 Lucerne that came into my shop with a problem that had stumped two other mechanics. The car would run fine for about 20 minutes, then suddenly stall and refuse to restart for an hour. There were no consistent trouble codes, just a random U0100 (Lost Communication with ECM) that would appear and disappear. After checking all the wiring and grounds, we focused on the ECM. On the bench, we found that as the module heated up to normal operating temperature, an internal processor would fail. Swapping in a VIN-programmed ECM like this one resolved the issue instantly. The customer went from being ready to sell the car to having his reliable daily driver back.
Is Your Buick Exhibiting These ECM Failure Signs?
A failing computer can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution. Look out for:
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606 (ECM/PCM Processor Fault) or U-series communication codes.
- ✔ The engine cranks but refuses to start.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ A significant drop in fuel economy for no apparent reason.
- ✔ Stalling, stumbling, or hesitation during acceleration.
- ✔ Misfires or a rough idle that can’t be traced to plugs or coils.
Your Straightforward Installation Guide
Installing your pre-programmed 2006 Lucerne Engine Control Module is a manageable job for a confident DIYer. While the exact location can vary slightly by model, the process is generally the same.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for the system to discharge.
- Locate the ECM: On the 2006 Lucerne, the ECM is typically found bolted to the lower part of the air cleaner filter box assembly in the engine bay.
- Disconnect Harnesses: Carefully unclip and disconnect the electrical wiring harnesses from the old module. These connectors have locking tabs that must be released before pulling.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed ECM in place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You may need to perform a simple key-cycle security relearn. Turn the key to the ‘ON’ position for 10 minutes, ‘OFF’ for 10 seconds, and repeat two more times. Then, the vehicle should start.
Verified Compatibility for a Wide Range of GM Vehicles
This ECM is a direct replacement for service number 19210737 and is interchangeable with part numbers 12590032, 12602044, 12603530, 12605843, 12607096, and 12630457. Please verify your part number and check the detailed fitment list below to ensure compatibility. Providing your VIN upon purchase is essential for us to deliver a perfectly matched and programmed module.
Frequently Asked Questions
Do I need to program this module?
No. This is the core benefit of our service. We program the module with the latest GM software using the VIN you provide, so it arrives ready to install. This saves you from needing specialized tools or a costly dealership visit.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
My old ECM has a different part number. Will this still work?
Yes, as long as your original part number is one of the listed interchangeable service numbers (e.g., 12607096, 12603530, etc.). Manufacturers often supersede part numbers over time. This module is the correct hardware for all listed numbers.
Will this fix my transmission shifting problems?
In many GM vehicles, the ECM and Transmission Control Module (TCM) work together, or the ECM controls shifting directly. If the shifting issues are caused by faulty data or processing from the ECM, then yes, this new module will resolve them.
What is the ‘security relearn’ and is it difficult?
The security relearn syncs the new ECM with your car’s anti-theft system. It’s very simple and requires no tools. Just follow the 3-cycle key ‘ON’/’OFF’ procedure detailed in the installation guide. The whole process takes about 30 minutes.