Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet, GMC, or Isuzu suffering from erratic behavior? A faulty Powertrain Control Module (PCM), often called the Electronic Control Module (ECM), is frequently the culprit behind a host of frustrating issues. As the central computer for your vehicle, the PCM manages everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it fails, the symptoms can range from a simple check engine light to a complete no-start condition. This replacement module, part number 16263494, is the definitive solution to restore your vehicle’s reliability and drivability.
The Plug-and-Play Solution Your Vehicle Needs
Forget expensive trips to the dealership or the hassle of finding a local shop with the right programming tools. We take the guesswork out of the repair. When you purchase this module, we will flash it with the latest official GM software updates, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures perfect compatibility and function right out of the box. Simply provide us with your VIN after purchase, and we’ll handle the complex programming before it ships. The result is a simple, direct-fit replacement that gets you back on the road quickly.
From the Diagnostic Bay
We had a 2000 Chevy Express van come in with a complaint of harsh, unpredictable shifting and a check engine light for a transmission solenoid code. The owner had already replaced the solenoid pack twice with no improvement. We hooked up our scanner and monitored the data stream from the PCM. We noticed the command signals for the solenoids were dropping out intermittently, even though the transmission’s internal sensors were reading correctly. This pointed directly to a processing failure inside the computer. Instead of chasing phantom transmission problems, we installed a correctly programmed PCM. The van immediately began shifting smoothly, and the trouble code never returned. It’s a classic case of symptoms in one area being caused by the electronic brain in another.
Common Symptoms of a Failing 1999-2000 Chevrolet 3500 PCM
If you’re experiencing any of the following issues, a failing powertrain module is a likely cause. A replacement is often the most direct and effective repair.
- ✔ Check Engine Light (CEL) is illuminated with various trouble codes.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ A significant, unexplained drop in fuel economy.
- ✔ The engine cranks but refuses to start.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Intermittent failure of electronic components like fuel injectors or ignition coils.
Guaranteed Compatibility
This module is a direct replacement for several part numbers, including 16263494, 16265035, 8162634940, and 218-11787. It fits a wide range of GM trucks and vans from the late 1990s and early 2000s, including the Chevrolet Silverado, Express, Tahoe, S10, and GMC Sierra, Savana, Yukon, and more. Please verify your part number and consult the detailed fitment list to ensure this is the correct component for your vehicle. Our VIN-specific programming finalizes the compatibility, making this a perfect match for your truck’s original factory settings.
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
No. This PCM arrives at your door fully programmed to your vehicle’s VIN with the latest GM software. It is ready for installation right out of the box. In most cases, you will not need to perform any additional procedures, though some vehicles may require a security relearn which can be done without special tools.
Where do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for the module to function in your vehicle.
Is this a difficult part to install?
For most of the listed vehicles, the PCM is located in the engine bay and is held in place by a few bolts and electrical connectors. Installation is straightforward for a DIY mechanic with basic tools. The most important step is to disconnect the vehicle’s battery before starting the replacement to prevent any electrical damage.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the problem first. This module will not fix issues caused by other failed sensors or mechanical components.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. PCM (Powertrain Control Module) typically controls both the engine and transmission, while an ECM (Engine Control Module) controls only the engine. For most vehicles covered by this part, it functions as a PCM, managing both systems.