Restore Peak Performance to Your GM Vehicle
Is your truck or van suffering from perplexing issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition? The Powertrain Control Module (PCM), often called the vehicle’s brain, is frequently the source of these frustrating problems. This replacement PCM is the definitive solution for a wide range of late 90s and early 2000s GM vehicles, including the Chevrolet Express, GMC Savana, S10, Silverado, and more. It’s not just a replacement part; it’s a restoration of your vehicle’s original performance and reliability.
From the Diagnostic Bay
We had a 2001 Savana 3500 work van come into the shop with what the owner was convinced was a failing transmission. It was shifting hard, hunting for gears, and sometimes wouldn’t shift out of first. He was bracing for a multi-thousand dollar transmission rebuild. After hooking up our diagnostic scanner, we noticed erratic data from the PCM to the transmission control solenoids. Instead of tearing down the transmission, we swapped in a VIN-programmed PCM. The van immediately started shifting perfectly. The issue was never mechanical; it was the computer failing to communicate correctly. This simple replacement saved the owner a massive headache and a huge repair bill.
Is Your Vehicle Showing Signs of a Failing PCM?
A faulty PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your PCM could be the culprit:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ Unexplained drops in fuel mileage.
- ✔ Engine stalling, stumbling, or running rough at idle.
- ✔ The vehicle cranks but refuses to start.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Critical Role of a Programmed 1999-2002 Savana 3500 PCM
Replacing a PCM isn’t as simple as swapping a battery. Each module is programmed with software specific to a vehicle’s Vehicle Identification Number (VIN). This software controls everything from fuel injector timing and spark advance to transmission shift points and emissions equipment. Our process ensures you receive a module that is a perfect match for your vehicle. We flash it with the latest GM-authorized software updates using your VIN. This not only restores original functionality but can also correct common issues that GM addressed after the vehicle left the factory. This is a true plug-and-play solution, designed to get you back on the road with confidence.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 21811787. By providing your VIN upon purchase, you guarantee compatibility and eliminate the need for expensive dealership programming or specialized tools for installation.
Frequently Asked Questions
Why do you need my VIN?
Your vehicle’s VIN (Vehicle Identification Number) is essential for us to load the exact, correct software for your specific engine, transmission, and emissions options. This ensures the module works perfectly right out of the box without any additional programming.
Is this part difficult to install?
For most models, the PCM is located in the engine bay and is held in by a few bolts and electrical connectors. Installation is typically straightforward for someone with basic mechanical skills. After installation, some vehicles may require a security relearn procedure (often called a CASE relearn), which can usually be done without special tools. Instructions are widely available online for this simple process.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the old PCM, then yes, this new module will resolve the issue. However, it’s crucial to ensure the codes are not being caused by a faulty sensor or wiring issue elsewhere on the vehicle.
Do I need to return my old computer?
No core charge is required for this part. You can keep your old module, though we always recommend recycling old electronics responsibly.
Is this compatible with my Chevy Express or Silverado?
Yes, this module fits a very wide range of GM trucks and vans from approximately 1998 to 2002 that use part number 16263494 or its equivalents. Please review the detailed fitment list on this page and provide your VIN to guarantee a perfect match.