Is Your Truck Running Rough, Stalling, or Showing a Check Engine Light?
If your 1998-1999 GM truck or van is suffering from perplexing electrical or performance issues, the root cause is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions controls. When it begins to fail, it can create a cascade of problems that are difficult to diagnose and can sideline your vehicle indefinitely.
This is a genuine, tested OEM PCM, part number 16258815, that serves as a direct-fit replacement for a wide range of GM vehicles from this era. The most significant advantage of our service is that we program the module specifically for your vehicle using your VIN. This means it arrives loaded with the latest factory software updates from GM, ensuring optimal performance and compatibility right out of the box. You get a solution that avoids a costly and time-consuming trip to the dealership for programming.
From the Diagnostic Bay
We had a 1999 Suburban 1500 come into the shop with a complaint of intermittent stalling and a harsh 1-2 shift. The owner had already replaced the throttle position sensor and the mass airflow sensor with no improvement. After hooking up our scanner, we noticed erratic data from multiple sensors, but none were consistently failing. This is a classic sign of a failing PCM. The internal processors start to break down, sending faulty signals and misinterpreting data. We installed a VIN-programmed PCM like this one, performed the security relearn, and the truck ran perfectly. It saved the customer from chasing down phantom sensor issues and got their vehicle reliable again.
Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) with various or no specific codes.
- ✔ Engine stalling, misfiring, or running rough.
- ✔ No-start or hard-start conditions, especially when warm.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy.
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ Other electrical modules acting erratically.
Why Choose Our Pre-Programmed 1998-1999 Chevrolet 2500 PCM?
Getting your truck back to factory-spec operation is our priority. This isn’t just a used part pulled from a yard; it’s a fully vetted and prepared solution. We handle the critical programming step for you. Simply provide your vehicle’s VIN after purchase, and our technicians will flash the unit with the correct software for your specific engine, transmission, and options. This ensures a seamless installation process and restores the precise control your vehicle’s powertrain needs to function correctly.
Please Note: Upon installation, you may need to perform a security relearn procedure (often called a CASE relearn or anti-theft relearn). This is a standard process for most GM vehicles that syncs the new PCM to your vehicle’s security system and crankshaft position sensor. This procedure can typically be done without special tools and instructions are widely available.
This module is compatible with multiple part numbers, including: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. Please verify your part number and check the extensive fitment list to ensure this is the correct component for your vehicle.
Frequently Asked Questions
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your vehicle had when it left the factory. This includes information about the engine size, transmission type, emissions equipment, and other options, ensuring perfect compatibility and performance.
Is this module difficult to install?
Physically, the PCM is typically located in the engine bay and is held in by a few bolts and has several large electrical connectors. The installation is straightforward for a DIY mechanic. However, you will likely need to perform a security relearn procedure after installation to sync the computer with your vehicle, which is a necessary step for most replacements.
Is this a “plug and play” part?
Because we pre-program it to your VIN, it is as close to “plug and play” as you can get. It will control the engine and transmission correctly upon installation. The only additional step is the potential need for the security/anti-theft relearn procedure, which pairs the module to your specific vehicle.
What if my original part number is slightly different but my vehicle is on the list?
This PCM is a direct replacement for several part numbers, as listed in the description (e.g., 09355699, 16266645). As long as your vehicle model and year are on the compatibility list and your original part number is one of the alternates, this unit will function correctly once programmed to your VIN.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. We ensure it is fully functional before programming it with the latest GM software for your vehicle.