Restore Your Truck’s Performance and Reliability
Is your dependable Chevrolet 3500 suddenly plagued with frustrating issues like stalling, erratic shifting, or a persistent check engine light? A failing Powertrain Control Module (PCM) is often the hidden culprit behind these problems, leaving you stranded and costing you valuable time. This genuine OEM engine computer is the definitive solution to get your workhorse back on the road, running with the consistency and power you rely on. We pre-program this unit specifically for your truck using your Vehicle Identification Number (VIN), ensuring it arrives ready for a straightforward installation.
Common Symptoms & Your Solution
If your truck is experiencing any of the following, a faulty PCM is the likely cause. This programmed module is designed to correct these exact issues:
- Unexpected stalling or shutting off while driving
- Harsh or inconsistent automatic transmission shifting
- Complete no-start condition with power to all other systems
- Illuminated Check Engine Light with communication error codes (U-codes)
- Poor fuel economy and reduced engine power
- Apparent failure of multiple sensors at once
By replacing your old unit with this professionally programmed 1999 Chevrolet 3500 PCM, you’re not just swapping a part; you’re restoring the core of your vehicle’s engine management system to its original, reliable state.
Features & Benefits
- ✔ VIN-Programmed for Your Truck: We flash the module with the latest GM software updates matched precisely to your VIN. This eliminates the need for expensive trips to the dealership for programming.
- ✔ Genuine OEM Component: This is a tested, factory-original part, not a low-quality aftermarket alternative. It guarantees perfect communication with your vehicle’s other modules and sensors.
- ✔ Cost-Effective Repair: Get a reliable, ready-to-install solution for a fraction of the cost of a new computer from a dealer.
- ✔ Restores Original Performance: Corrects issues caused by a failing computer, restoring smooth idling, proper shift points, and efficient engine operation.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight from the Shop Floor
As a technician, I’ve seen countless hours and dollars wasted chasing ghosts in these GMT400 trucks. A failing PCM can send out bizarre signals, making you think you have a bad throttle position sensor, a faulty transmission solenoid, or a failing fuel pump. You replace part after part, but the problem persists. The issue is that the ‘brain’ is giving bad commands. This pre-programmed 1999 Chevrolet 3500 PCM is the correct foundational fix. It ensures the entire system has a reliable command center, saving you from the frustrating and expensive cycle of replacing perfectly good parts.
Complete Fitment List
This module is a direct replacement for service number 16258815 and interchanges with part numbers 09355699, 16266645, 9355699, 16250279, 09366810, and 9366810. It is confirmed to fit a wide range of GM trucks, vans, and SUVs. Please verify your part number before ordering. This part fits dozens of models including the Chevrolet 1500/2500/3500 Pickups, Suburbans, Tahoes, Express Vans, and their GMC Sierra, Yukon, and Savana counterparts from 1998-1999.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as the programming is specific to your vehicle.
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 CASE relearn or Passlock relearn). This is a simple process that syncs the new computer to your vehicle’s anti-theft system and can typically be done without special tools. Instructions are widely available online for your specific model.
Is this a new computer?
No, this is a high-quality, used OEM computer that has been carefully removed from a salvaged vehicle. Each unit is inspected and then programmed with the latest software for your specific VIN, providing OEM reliability at a great value.
What if my original part number is not 16258815 but is on the interchange list?
If your original part number is listed in our description (e.g., 09355699, 16266645), this computer will work as a direct replacement once programmed to your VIN. These numbers are often updated by the manufacturer, but the core hardware is compatible.
Why is a programmed PCM better than a generic one?
A PCM programmed to your VIN contains the specific software and calibrations for your truck’s engine, transmission, and options. A generic, unprogrammed unit will not start or run the vehicle correctly and would require a trip to a dealer or specialized shop with expensive tools, defeating the purpose of a DIY repair.