Restore Your GM’s Dependability
Is your trusty GM truck, van, or SUV suddenly running rough, stalling, or refusing to start? A failing Engine Control Module (ECM) is often the culprit behind these frustrating and unpredictable issues. Instead of facing a costly bill and programming headache at the dealership, get the smart, reliable solution. This engine computer, compatible with part number 16266645, is professionally programmed to your vehicle’s specific VIN, ensuring you get a part that’s ready to restore your vehicle’s performance and get you back on the road with confidence.
Common Symptoms of a Failing ECM & Your Direct Solution
If you’re experiencing any of the following, a faulty engine computer is the likely cause. This professionally programmed 16266645 ECM is the definitive solution to correct these problems:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) related to internal module failure (e.g., P0601, P0605)
- Rough or unstable idle
- Engine stalling or cutting out unexpectedly
- Poor fuel economy
- Hesitation or lack of power during acceleration
- Erratic automatic transmission shifting
- Complete no-start condition where the engine cranks but won’t fire
Features & Real-World Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash this ECM with the latest GM software using your vehicle’s unique VIN. This ensures a seamless installation and proper communication between all modules, just like the original.
- ✔ Guaranteed Compatibility: This unit is a direct replacement for multiple part numbers, including 16266645 and 09355699. Check our detailed fitment list to confirm it’s the right part for your truck, van, or SUV.
- ✔ Cost-Effective Repair: Avoid the high costs and programming fees of a new computer from a dealership. This is a budget-friendly way to get your reliable GM vehicle back in service.
- ✔ Restores Peak Performance: A properly functioning engine computer is critical for optimal engine performance, fuel efficiency, and smooth transmission shifting. Get your workhorse running right again.
- ✔ Tested & Inspected: While sourced from salvaged vehicles, each computer is carefully inspected to ensure it is a solid, functional core ready for programming and a new life in your vehicle.
- ✔ One-Year Replacement Coverage: This unit is backed by our one-year replacement warranty, giving you confidence in your purchase.
A Technician’s Take: As a tech with over 20 years on the bench, I’ve seen countless issues caused by mismatched computers. A generic, unprogrammed ECM can cause more problems than it solves, from transmission shift points being off to anti-theft systems preventing the engine from starting. That’s why VIN-specific programming isn’t just a feature—it’s the most critical step. We handle that for you, ensuring the programmed 16266645 ECM you receive is truly ready to command your vehicle’s systems correctly from the moment you turn the key.
Frequently Asked Questions
Do I need to do any additional programming after installation?
No. This ECM arrives pre-programmed to your vehicle’s VIN and is ready to be installed. However, on some GM vehicles of this era, you may need to perform a simple security relearn procedure (often called a Passlock or VATS relearn) to sync the new computer with your vehicle’s anti-theft system. This can typically be done in your driveway without any special tools.
How do I provide you with 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 part without it. You can find your VIN on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your insurance and registration documents.
What if my original part number isn’t exactly 16266645?
That’s okay. This ECM is a direct replacement for a range of part numbers, including 09355699, 9355699, 16250279, and others listed in the description. As long as your vehicle is on the compatibility list and your original part number is one of the alternates, this unit will function correctly once programmed.
Is this a new part?
This is a high-quality, inspected used part sourced from a salvaged vehicle. Using a tested original equipment part ensures the best fit and function, and our programming service brings it up to date for your specific vehicle.
Will this fix my transmission shifting problems?
In many cases, yes. The ECM (or PCM) controls both the engine and the transmission. If the computer is failing, it can send incorrect signals to the transmission, causing harsh shifts, delayed engagement, or other issues. Replacing a faulty ECM often resolves these electronically-caused transmission problems.