Restore Your Vehicle’s Core Performance and Reliability
Is your Buick, Chevy, or Cadillac suddenly running rough, refusing to start, or displaying a persistent Check Engine Light? These frustrating and often confusing issues frequently point to a failing Engine Control Module (ECM), the central computer of your vehicle. When the ECM falters, it can cause a cascade of problems, from poor fuel economy to unpredictable stalling. This isn’t just an inconvenience; it’s a critical component failure that needs a reliable solution.
We offer a dependable, direct-replacement Engine Control Module, part number 12630457, that arrives at your door fully programmed to your specific vehicle. Before we ship, our technicians use your Vehicle Identification Number (VIN) to flash the module with the latest, most stable software updates directly from GM. This critical service ensures that your new ECM communicates flawlessly with your vehicle’s existing systems, effectively restoring factory performance and eliminating the need for an expensive trip to the dealership for programming.
A Technician’s Notebook
I once had a 2008 Chevy Trailblazer in my bay with a whole host of sensor-related codes—throttle position, MAP sensor, you name it. The previous mechanic had already replaced three different sensors without success. The Check Engine Light always came back. After checking the wiring, I tested the 5-volt reference circuit supplied by the ECM. It was erratic, sometimes dropping to 3 volts. The root cause wasn’t the sensors at all; it was an internal failure in the ECM’s power supply. We installed a VIN-programmed ECM like this one, and all the ghost codes vanished instantly. It’s a classic case of treating the disease, not just the symptoms.
Is Your Vehicle Showing These ECM Failure Signs?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer may be the culprit. Look out for these common red flags:
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Unexplained drop in fuel efficiency
- ✔ Engine cranks but refuses to start
- ✔ Rough idling, stalling, or hesitation during acceleration
- ✔ Automatic transmission shifting issues
- ✔ Communication error codes, such as U0100 (Lost Communication With ECM/PCM)
- ✔ Internal module failure codes, like P0601, P0603, or P0606
- ✔ Failure to pass state emissions testing
Your Straightforward ECM Installation Guide
Installing your new 2006 Lucerne Engine Control Module is a manageable task for a confident DIYer. Because we program it to your VIN, no further flashing is required. Just follow these general steps to get back on the road.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the ECM: On many compatible vehicles like the Lucerne or Impala, the ECM is found in the lower part of the air cleaner box. On others, like the Trailblazer or Envoy, it’s on the driver’s side of the engine bay. Consult a repair manual for your specific model if you’re unsure.
- Disconnect the Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damaged pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are typically a few bolts or nuts holding it in place.
- Install the New ECM: Mount your new, pre-programmed module in the same location. Re-tighten the mounting bolts securely.
- Reconnect Everything: Plug the wiring harnesses back into the new ECM until they click firmly into place. Reconnect your negative battery terminal.
- Final Steps: Some vehicles may require a security relearn procedure, which can often be done without special tools (e.g., by cycling the key). Your vehicle is now ready to start.
Verified Vehicle Compatibility
This ECM is a direct replacement for service number 12630457 and is also interchangeable with part numbers 12590032, 12602044, 12603530, 12605843, 12607096, and 19210737. It fits a vast range of GM, Isuzu, and Saab vehicles. Please verify your model and engine options below. This is a partial list of popular applications:
Cadillac: CTS, DTS, STS, SRX, XLR
Chevrolet: Cobalt, Colorado, HHR, Impala, Malibu, Monte Carlo, Trailblazer, Uplander
GMC: Acadia, Canyon, Envoy
Hummer: H3
Isuzu: Ascender, i-290, i-370
Pontiac: G6, Grand Prix, Pursuit, Solstice
Saab: 9-7x
Saturn: Aura, Ion, Outlook, Relay, Vue
Note: Please refer to the detailed fitment chart at the top of the page to confirm compatibility with your specific year, model, and engine combination.
Frequently Asked Questions
Frequently Asked Questions
What exactly is VIN programming?
VIN programming, or flashing, is the process of loading your vehicle’s specific software onto the ECM. This includes information about your engine, transmission, and factory options. We handle this for you before shipping, so the part is ready for installation right out of the box.
Do I need to do anything special after installing this ECM?
In most cases, no. The module is plug-and-play. Some vehicles may require a simple key-cycle security relearn procedure, which your owner’s manual can describe. No expensive scan tools are needed.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it.
Is this a reliable, long-term fix?
Absolutely. We provide high-quality replacement modules loaded with the latest stable GM software to address many of the original factory bugs. This is a durable solution designed to restore your vehicle’s proper function.
Will this fix my specific problem?
This module is designed to correct issues directly caused by a faulty ECM, such as the symptoms listed above. While it is a common point of failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the ECM is the part you need.