Get Your Workhorse Back on the Road, Fast.
Is your GM truck or van plagued by frustrating issues like erratic shifting, a persistent check engine light, or a no-start condition? A failing Powertrain Control Module (PCM) is a common cause, disrupting the critical communication between your engine and transmission. This can sideline your vehicle, costing you time and money. This fully programmed Engine Control Module is the definitive, hassle-free solution to restore your vehicle’s reliability and get you back to work.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty PCM is the likely culprit. This replacement unit is designed to solve these problems:
- Harsh or delayed automatic transmission shifts
- Unexplained Check Engine Light (CEL)
- Poor engine performance or stalling
- Reduced fuel economy
- Vehicle won’t start, despite a good battery and starter
- Communication error codes with diagnostic scan tools
By replacing your old module with this pre-programmed unit, you’re not just swapping a part—you’re restoring the brain of your vehicle’s powertrain. We handle the complex programming for you, so you can get back on the road with minimal downtime. This is the most efficient way to fix the problem correctly the first time.
Features & Tangible Benefits
- ✔ Programmed to Your VIN: We flash the module with your vehicle’s specific VIN and the latest GM software updates. This ensures it works seamlessly with your truck’s systems right out of the box, saving you a costly trip to the dealership.
- ✔ Restored Drivability: By installing a correctly functioning PCM, you’ll restore crisp shifting, smooth idling, and the dependable engine performance you rely on.
- ✔ Cost-Effective Solution: Get a reliable, tested OEM computer for a fraction of the price of a new unit, providing a smart repair that respects your budget.
- ✔ Broad Compatibility: This module fits a wide range of popular 1998-1999 GM trucks, vans, and SUVs, including the Chevrolet Express, GMC Sierra, Chevy Suburban, and more. See the full fitment list to confirm for your vehicle.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty. Drive with confidence knowing your purchase is protected.
Expert Insight: The Brains of Your Operation
In late-90s GM vehicles like yours, the PCM does more than just manage the engine—it’s deeply integrated with the electronically controlled transmission (like the 4L60E or 4L80E). Many persistent shifting problems that seem mechanical are actually caused by a failing computer. The original software in these modules can degrade over time, leading to poor communication. By installing a tested unit with fresh, updated GM software, you’re often solving both engine and transmission issues at once, ensuring all components work together as the factory intended.
Don’t let a faulty computer dictate your schedule. This pre-programmed 1999 GMC Savana 3500 PCM is your direct path to a reliable repair. After your purchase, simply provide us with your vehicle’s VIN, and we’ll prepare the module for shipment. It’s that simple.
Frequently Asked Questions
What information do I need to provide?
After you place your order, you must provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to program the module correctly for your specific vehicle configuration.
Is this part ready to install when it arrives?
Yes, the module arrives programmed to your VIN. However, on many GM vehicles of this era, you may need to perform a simple, key-on procedure known as a Security Relearn or a Crankshaft Variation Relearn (CASE). These procedures can often be done without special tools and instructions can be readily found online.
Is this a new computer?
No, this is a high-quality, used OEM computer that has been carefully removed from a salvaged vehicle, inspected, tested, and then programmed with the latest software for your vehicle. This provides a reliable and affordable alternative to sourcing a new part.
How can I be sure this fits my vehicle?
The best way to ensure compatibility is to match the part number from your original module to one of the numbers listed in our description (e.g., 16266645, 09355699). Please also review the detailed fitment list provided on this page. If you’re unsure, feel free to contact us with your VIN.
Will this fix my hard shifting transmission?
In many cases, yes. The PCM directly controls transmission line pressure and shift points. A failing module is a very common cause of shifting problems in these GM trucks and vans. While it’s not a guarantee for every mechanical issue, it is the most common solution for electronically-related transmission faults.