Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 Chevrolet, GMC, or Cadillac truck, van, or SUV running poorly? Experiencing a persistent check engine light, erratic shifting, or a frustrating no-start condition? The Powertrain Control Module (PCM), the central computer for your engine and transmission, is often the culprit. This vital component orchestrates everything from fuel injection and ignition timing to transmission shift points and emissions control. When it fails, the symptoms can be widespread and difficult to diagnose. This listing offers a direct, reliable solution: a genuine used GM PCM, part number 09366810, professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN).
From the Diagnostic Bay
I remember a customer with a ’99 Suburban who was at his wit’s end. The truck would randomly stall at stoplights and had a harsh 1-2 shift that felt like being rear-ended. He had already replaced the fuel pump, spark plugs, and even the transmission fluid, with no improvement. After hooking up our scanner, we noticed erratic data from the throttle position sensor and intermittent communication loss with the module. Instead of a faulty sensor, the root cause was a failing PCM that was misinterpreting sensor data. We installed a VIN-programmed PCM just like this one, performed the security relearn, and the truck ran like it just rolled off the showroom floor. It’s a classic example of how a single electronic component can mimic a dozen different mechanical failures.
The Importance of a VIN-Programmed 1998-1999 Chevrolet 2500 PCM
In modern vehicles, the PCM is not a one-size-fits-all part. Each module is programmed with software specific to the vehicle’s VIN, which accounts for its engine size, transmission type, emissions equipment, and other factory options. Simply swapping a module from another vehicle will almost certainly result in running issues or a complete no-start situation due to security system conflicts (like GM’s Passlock system). Our process eliminates this guesswork. When you purchase, you provide us with your VIN. We then flash this module with the latest, most up-to-date software directly from GM for your exact vehicle. This ensures seamless integration, correct engine and transmission operation, and proper communication with all other vehicle modules.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Poor fuel economy and loss of power.
- ✔ Vehicle fails to start or starts intermittently.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Inaccurate or non-functional dashboard gauges.
Guaranteed Compatibility and Simple Installation
This PCM, identified by part number 09366810, is a direct replacement for a wide range of original equipment part numbers, including 09355699, 16266645, and more. It is compatible with an extensive list of popular 1998-1999 GM models such as the Chevrolet Silverado, Suburban, Tahoe, Express Van, and their GMC counterparts like the Sierra, Yukon, and Savana. Please review the detailed fitment list to confirm compatibility. Installation is straightforward: disconnect the battery, unplug the electrical connectors from your old PCM, unbolt it from its bracket, and install the new one in its place. After installation, a simple security relearn procedure (often called a Passlock relearn) is typically required, which can be done without special tools. Instructions for this procedure are widely available online or in service manuals.
Frequently Asked Questions
Do I need to send my old computer in?
No, there is no core charge or need to return your original module. This is an outright purchase.
What information do you need from me?
After you place your order, we require your vehicle’s 17-digit VIN to program the module correctly. This ensures it matches your vehicle’s specific configuration.
Is this a new part?
No, this is a high-quality, tested, and fully functional used part sourced from a salvaged vehicle. Each unit is inspected and then programmed with fresh, vehicle-specific software.
Will I need to do anything after installing it?
Yes. After installing the PCM, you will need to perform a security relearn procedure, also known as a Passlock relearn. This syncs the new computer with your vehicle’s anti-theft system. This procedure typically takes about 30 minutes and does not require any special tools.
What if my original part number is different?
This module is a direct replacement for several part numbers, including 09355699, 16266645, 9355699, and others listed in the description. As long as your vehicle is listed in the compatibility chart, this programmed module will function correctly.