Is Your GM Vehicle Running Rough, Stalling, or Refusing to Start?
A faulty Engine Control Module (ECM) can be the source of countless frustrating and hard-to-diagnose issues. If you’re dealing with a persistent check engine light, erratic engine behavior, or poor fuel economy, you’ve found the reliable, straightforward solution. This engine computer is the brain of your vehicle, and when it fails, nothing works correctly. We provide a dependable, pre-programmed module that gets your truck, van, or SUV back on the road and running strong, eliminating the guesswork and the expensive trip to the dealership.
Common Symptoms & Your Solution
A failing ECM can manifest in various ways. If you’re experiencing any of the following, this module is your definitive fix:
- Persistent Check Engine Light (CEL) with communication-related diagnostic trouble codes (DTCs) like P0601, P0602, or P0606.
- Engine Stalling or Misfiring: Unpredictable stalling, rough idling, or misfires that new spark plugs and coils can’t fix.
- No-Start Condition: The engine cranks but won’t start, often due to the ECM not firing the injectors or coils.
- Poor Performance & Fuel Economy: A noticeable loss of power and a sudden drop in your vehicle’s MPG.
- Erratic Transmission Shifting: The ECM plays a key role in communicating with the transmission controller, and a failure can cause harsh or incorrect shifting.
This Programmed 12625455 ECM is professionally flashed with the latest official GM software updates, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures perfect compatibility and restores your engine’s original performance and efficiency.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: No extra programming needed. This unit arrives ready for installation, saving you hundreds in dealership fees and programming costs.
- ✔ Restored Engine Performance: By correcting engine management functions, you’ll regain the smooth acceleration, stable idle, and power your vehicle had when it was new.
- ✔ Plug-and-Play Installation: Designed as a direct-fit replacement for the original part numbers 12625455 and 12629009, making the swap as simple as possible.
- ✔ Updated GM Software: We flash the module with the most current calibrations from General Motors, ensuring all known bugs and performance issues are resolved.
- ✔ This unit is backed by our one-year replacement warranty.
An Expert’s Note on ECM Replacement
As a technician with over 20 years of experience, I’ve seen countless vehicle owners waste time and money chasing symptoms when the root cause was the ECM. Many will buy a used module from a junkyard, only to find it’s incompatible or creates new problems because it’s not programmed for their specific vehicle’s VIN and options. Our process of programming this Programmed 12625455 ECM before it ships is the most critical step. It ensures the module communicates correctly with all other systems in your vehicle—from the transmission to the anti-lock brakes—for a seamless and successful repair.
Frequently Asked Questions
What is the process after I place my order?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot ship your part until we receive it. Once we have your VIN, our technicians will program the ECM with the latest GM software specific to your vehicle’s configuration. It will then be securely packaged and shipped to you.
Is this ECM difficult to install?
For most of the listed vehicles, the ECM is in an accessible location (like the LH front or rear of the engine compartment). Installation typically involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and then reversing the process. It’s a task many DIYers can handle with basic tools. We always recommend consulting a repair manual for your specific model.
Will I need to do anything after installation?
In some GM vehicles, a security relearn procedure or a Crankshaft Variation Relearn (CASE) may be required after installation for the vehicle to start and run correctly. These procedures are often simple and can be done without special tools, but please check the specific requirements for your model.
How do I know this will fix my vehicle’s problem?
While this ECM is the definitive solution for module-related failures, it’s essential to ensure your vehicle has been properly diagnosed. Please confirm that other potential causes, such as wiring issues or faulty sensors, have been ruled out by you or your mechanic. This part will resolve issues directly caused by a failing ECM.
Why is providing my VIN so important?
The VIN allows us to load the exact software and calibrations your vehicle was built with. This includes parameters for the engine size, transmission type, emissions equipment, and other options. Without the correct VIN programming, the vehicle may not start, run poorly, or have warning lights on the dash.
Is this a new or used part?
This is a quality, inspected, and tested used OEM part that has been professionally programmed to function to factory specifications for your vehicle.