Is Your Vehicle Running Rough, Stalling, or Throwing Confusing Error Codes?
A failing Engine Control Module (ECM) can be the source of countless frustrating and hard-to-diagnose issues. From a persistent Check Engine Light to poor fuel economy or even a no-start condition, a faulty engine computer can bring your daily drive or work schedule to a grinding halt. This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s performance, reliability, and safety. You need a solution that is reliable, straightforward, and gets you back on the road without the exorbitant cost and hassle of a dealership visit.
Common Symptoms & Your Direct Solution
If you’re experiencing any of the following, a failing ECM is a likely culprit. This professionally programmed module is the definitive solution to restore your vehicle’s brainpower and eliminate these problems:
- Persistent Check Engine Light (CEL) with various codes
- Engine stalling, stumbling, or hesitating unexpectedly
- Noticeable decrease in fuel efficiency
- Rough or erratic idling
- Vehicle won’t start, despite a good battery and starter
- Communication errors with diagnostic scan tools (U-codes)
- Transmission shifting issues or harsh engagement
Our Programmed GM ECM 12670335 arrives at your door flashed with the latest GM software updates and coded specifically to your vehicle’s VIN. This eliminates the need for any additional programming, making the installation process as simple as possible.
Features & Benefits
- ✔ VIN-Specific Programming: We flash this module to your exact Vehicle Identification Number, ensuring perfect compatibility and communication with your vehicle’s other systems.
- ✔ Ready for Installation: This ECM arrives ready to be installed right out of the box. No extra trips to the dealer for expensive programming are required.
- ✔ Latest GM Software: Your module is loaded with the most current factory software, helping to resolve common drivability issues and optimize performance.
- ✔ Broad Compatibility: A direct replacement for multiple part numbers including 12668866, 12668994, 12643636, and more, covering a wide range of GM cars, trucks, and vans.
- ✔ Restored Performance: Corrects issues related to fuel mixture, ignition timing, and transmission control to bring back the smooth, reliable operation you expect.
- ✔ One-Year Protection: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Programming
As a technician with over two decades of experience, I’ve seen countless vehicle issues caused by improperly matched control modules. Grabbing a used ECM from a salvage yard might seem like a cheap fix, but it’s a huge gamble. Without being correctly programmed to your specific VIN, it can create a cascade of new problems, from immobilizer lockouts to incorrect transmission behavior. Our process ensures this Programmed GM ECM 12670335 integrates with your vehicle exactly as the original did, saving you from future diagnostic headaches and repeat repairs.
Frequently Asked Questions
How do I provide my vehicle’s VIN?
After you complete your purchase, you will receive instructions to send us your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it. You can typically find your VIN on your driver’s side door jamb sticker or on the dashboard viewable through the windshield.
Is any additional programming needed after I install it?
In most cases, no additional programming is required. This module is sent ready for installation. However, some vehicles may require a simple, key-on/key-off security relearn procedure or Case Variation Learn (crankshaft position sensor relearn), which can often be performed with a capable scan tool or by following a specific procedure. This ensures all systems are perfectly synchronized.
How can I be sure my old ECM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a qualified mechanic perform a full vehicle diagnostic. Common trouble codes pointing to ECM failure include P0601, P0606, and various communication (U-prefix) codes. A thorough diagnosis can confirm the ECM is the root cause before you purchase a replacement.
Will this fit my vehicle if my part number is slightly different?
Yes, this ECM is a direct replacement for a wide range of part numbers, including 12668866, 12668994, 12643636, 12663405, and others listed in the description. As long as your vehicle make, model, and year are listed, our VIN programming ensures it will function correctly.
What does the one-year replacement warranty cover?
The warranty covers the module for one year from the date of purchase. If the unit fails due to an internal defect within that period, we will provide a replacement. The warranty does not cover issues caused by improper installation or other failing components on the vehicle.