Get Your GM Truck Back on the Road, Fast.
Is your trusty 1998-1999 GM truck, SUV, or van suddenly unreliable? If you’re dealing with frustrating issues like a no-start condition, erratic shifting, stalling, or a persistent check engine light that no amount of parts-swapping can fix, a failing Powertrain Control Module (PCM) is the likely culprit. This isn’t just an inconvenience; it’s downtime that costs you time and peace of mind. Restore the dependable performance you count on with this genuine, VIN-programmed PCM.
Common Symptoms & Your Solution
A faulty engine computer can cause a cascade of confusing problems. This unit is the definitive solution for issues such as:
- Engine stalling or cutting out unexpectedly
- Harsh or unpredictable automatic transmission shifting
- Complete no-start condition where the engine cranks but won’t fire
- Check Engine Light (CEL) with communication-related Diagnostic Trouble Codes (DTCs)
- Noticeable decrease in fuel economy
- Misfires or rough running that isn’t solved by new plugs or wires
Instead of continuing to guess, install a computer that’s programmed specifically for your vehicle. We use your Vehicle Identification Number (VIN) to load the latest, most stable software from General Motors, ensuring your engine and transmission operate exactly as the manufacturer intended. This is the core of your vehicle’s nervous system, and our programmed 1998 1999 GM truck PCM is the reliable heart transplant it needs.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash this computer with your truck’s specific VIN and the newest GM software updates before it ships. This ensures seamless communication with your vehicle’s systems, right out of the box.
- ✔ Plug-and-Play Installation: Because it’s pre-programmed, you can avoid expensive trips to the dealership for programming. In many cases, a simple security relearn procedure is all that’s needed after installation.
- ✔ Restores Original Performance: Eliminate the guesswork and fix persistent running issues. A correctly functioning PCM restores proper fuel delivery, ignition timing, and transmission control for a smoother, more reliable ride.
- ✔ Cost-Effective OEM Solution: You get the reliability of a genuine GM part from a salvaged vehicle at a fraction of the cost of a new unit, without sacrificing quality or function. This is the smart fix for a workhorse vehicle.
- ✔ Broad Compatibility: This programmed 1998 1999 GM truck PCM is a direct replacement for multiple part numbers, including 09355699, 16266645, and more, covering a wide range of popular models like the Tahoe, Suburban, C/K Pickups, and Express vans.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty. Drive with confidence knowing your purchase is protected.
Expert Insight: The Brain of Your Vortec Engine
The PCM in these late-90s GM trucks—often called the “black box” ECU—is the central command for the legendary Vortec engine family (4.3L, 5.0L, 5.7L). It does more than just manage the engine; it controls the 4L60E/4L80E transmission’s shift points, torque converter lockup, and communicates with the anti-lock brake and security systems. When one fails, it’s not a simple component failure; it’s a system-wide communication breakdown. That’s why simply installing a used computer from a junkyard rarely works. Our VIN-specific programming is not an optional step—it’s the critical process that makes this a true, reliable solution, ensuring all modules speak the same language again.
Frequently Asked Questions
How do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically find this on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will I need to do anything else after installing this PCM?
In most cases, you will need to perform a security relearn procedure, also known as a Passlock or VATS relearn. This is a simple procedure that can be done without special tools and typically involves a sequence of turning the key on and off. Instructions are widely available online for your specific model. Some vehicles may also require a Crankshaft Variation Relearn (CASE relearn) which requires a scan tool, but many run perfectly without it.
Is this a new computer?
No, this is a high-quality, tested computer that was sourced from a salvaged vehicle. It is a genuine OEM part that has been professionally programmed to function like new for your specific vehicle.
How do I know if this part number will fit my truck?
This PCM, part number 09366810, directly replaces several other common part numbers like 09355699 and 16266645. Please check the extensive fitment list on this page. As long as your vehicle’s year, make, and model are listed, our VIN programming will ensure it is a perfect match for your specific options.
What if I order and my original problem isn’t fixed?
While this programmed 1998 1999 GM truck PCM is the definitive fix for many electronic issues, proper vehicle diagnostics are key. We guarantee the functionality of the computer itself. If you’re unsure if the PCM is your root problem, we recommend consulting with a professional mechanic or using a high-quality scan tool to check for communication codes with the ECU.