Get Your Workhorse Back on the Job
Is your trusty GM truck or van suddenly unreliable? Stalling at intersections, refusing to start, or shifting erratically can bring your work to a grinding halt. A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and complex electronic issues. Instead of facing a costly trip to the dealership and vehicle downtime, get the simple, effective solution. This genuine OEM engine computer is the brain of your vehicle, and we provide it fully programmed to your specific VIN, ensuring it’s ready to install right out of the box.
Common Failure Symptoms & Your Direct Solution
If you’re experiencing any of the following problems, a failing PCM is the likely cause. This pre-programmed unit is designed to be the definitive fix for:
- Complete no-start or intermittent starting conditions
- Engine stalling or cutting out while driving
- Harsh or unpredictable automatic transmission shifting
- A persistent Check Engine Light with communication-related codes (U-codes)
- Noticeable decrease in fuel economy and poor engine performance
- Apparent loss of spark or fuel injector pulse
This isn’t just a part; it’s a plug-and-play solution. We handle the complex programming so you can handle the straightforward installation. This is the fastest way to get your 1999 GMC 3500 PCM replacement and get your vehicle running right again.
Features & Benefits
- ✔ VIN-Programmed for Your Truck: This module arrives flashed with your vehicle’s specific VIN and the latest GM software updates. No additional, expensive dealership programming is required.
- ✔ Plug-and-Play Installation: Simply disconnect the old module and connect this one. It’s designed to restore your vehicle’s operation immediately after a security relearn procedure.
- ✔ Restored Performance & Efficiency: With updated software and correct vehicle parameters, you can expect your engine and transmission to operate as the factory intended, restoring lost power and fuel economy.
- ✔ Cost-Effective Solution: Avoid the high costs and scheduling hassles of a dealership repair. This is a practical, budget-friendly fix to get you back on the road.
- ✔ Genuine OEM Reliability: Sourced from a salvaged vehicle, this is an original factory part, ensuring perfect fitment and communication with your vehicle’s other modules—something aftermarket units can’t always guarantee.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
An Expert’s Note on GM Security Systems
As a technician, I’ve seen many DIYers get stuck after swapping a computer on these late-90s GM trucks. They install the part, but the truck still won’t start. Why? The GM Passlock/VATS security system. The PCM, Body Control Module, and ignition key communicate to prevent theft. When you install a new PCM, this chain is broken. Our pre-programming service correctly syncs the PCM to your VIN, making the final, on-vehicle security ‘relearn’ procedure simple and straightforward (often just a sequence of key cycles). We take the guesswork out of a complex electronic repair.
Getting your truck back to full strength is critical. A faulty computer can cause a cascade of problems that are difficult to diagnose. By choosing our pre-programmed 1999 GMC 3500 PCM replacement, you are selecting a reliable and efficient path to resolving these issues. We take a tested, genuine GM part and tailor it specifically for your vehicle, ensuring a seamless integration and a lasting repair. Provide us with your VIN at checkout, and we’ll handle the rest, shipping you a part that’s truly ready to get the job done.
Frequently Asked Questions
Do I need to do any programming myself?
No. We program the computer to your vehicle’s VIN before it ships. The only thing you may need to perform is a security relearn procedure, which typically involves a series of key cycles and does not require any special tools.
Is this a brand new part?
No, this is a tested, genuine OEM computer that was sourced from a salvaged vehicle. We use original factory parts because they ensure the highest level of compatibility and reliability with your vehicle’s systems.
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, you will need to send us your 17-digit 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 this fix my check engine light?
This module will resolve any issues and diagnostic trouble codes (DTCs) that are directly caused by a faulty PCM. If your check engine light is on due to other issues (e.g., a bad oxygen sensor, a loose gas cap), you will still need to address those separate problems. A full vehicle scan is always recommended.
What if my original part number isn’t 16258815?
This computer is a direct replacement for several part numbers, including 09355699, 16266645, and others listed in the description. As long as your vehicle’s year, make, and model are on our compatibility list, we will program this module to work perfectly for your application, regardless of the number on your old unit.
What is the difference between a PCM, ECM, and ECU?
The terms are often used interchangeably. ECU (Engine Control Unit) is a general term. ECM (Engine Control Module) typically refers to a computer that only controls engine functions. A PCM (Powertrain Control Module), like this one, is more integrated and controls both the engine and the automatic transmission functions.