Is Your GM Truck or Van Running Rough? The PCM Might Be the Culprit.
If you’re dealing with frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition in your late 90s or early 2000s GM vehicle, the Powertrain Control Module (PCM) is a likely suspect. As the central computer for your engine and transmission, a failing PCM can cause a cascade of problems that are difficult to diagnose. This module, also known as an ECM, is the brain behind your vehicle’s performance, and when it falters, everything suffers.
The Direct Solution for Your 1999-2000 Silverado PCM
Don’t let a faulty computer keep your reliable truck off the road. This Powertrain Control Module is a direct-fit, dependable solution for a wide range of GM vehicles, including the 1999-2000 Chevrolet Silverado and GMC Sierra. The best part? We eliminate the guesswork and costly trips to the dealership. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) during checkout, and our technicians will program the module with the latest official GM software updates specific to your truck. It arrives at your door ready for installation, saving you time and hassle.
From the Diagnostic Bay
We had a 2000 Sierra 1500 come in with a ghost of a problem. The owner complained of intermittent stalling at red lights and a weird hesitation when accelerating. No consistent codes were being stored, just a random misfire code now and then. We checked fuel pressure, spark, and sensors—all were fine. After hours of chasing wires, we decided to monitor the PCM data stream. We noticed the injector pulse width commands were dropping out randomly for milliseconds at a time. It was a classic case of an internally failing PCM. We installed one of our VIN-programmed modules, performed the security relearn, and the truck ran like it just rolled off the assembly line. The customer was thrilled to have his dependable truck back without a massive dealership bill.
Common Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light is on with various communication or sensor codes.
- ✔ Engine stalling or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A significant drop in fuel efficiency.
- ✔ The vehicle fails to start, but the battery and starter are good.
- ✔ Communication errors with diagnostic scan tools.
Replacing your faulty module with our pre-programmed unit is the most effective way to solve these issues and restore your vehicle’s original performance and reliability. This unit is a tested, reliable component that meets or exceeds original equipment specifications. It is compatible with multiple part numbers, including 16263494, 16265035, and 8162634940, ensuring broad application across many GM models from that era.
Please Note: After installation, you may need to perform a simple security relearn procedure (often called VATS or Passlock) to sync the new module with your vehicle’s anti-theft system. In some cases, a Crankshaft Variation Relearn (CASE) may also be required, which can be done with a capable scan tool.
Frequently Asked Questions
Do I need to get this module programmed?
No. This module comes pre-programmed to your vehicle using the VIN you provide at checkout. It is flashed with the latest GM software updates, making it a true plug-and-play solution.
Where can I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard visible through the windshield.
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, if the light is on due to other failing sensors or components, those issues will need to be addressed separately.
Is any special procedure required after installation?
In most cases, you will need to perform a security relearn procedure, which can typically be done without special tools and takes about 30 minutes. Instructions are readily available online for your specific model. A CASE relearn may also be needed for optimal performance.
Is this compatible with vehicles other than the Silverado?
Yes, this module fits a wide variety of GM trucks and vans from 1998-2002, including the GMC Sierra, Chevrolet Express, GMC Savana, S10, Blazer, and more. Please check the detailed fitment list to confirm compatibility with your specific model and options.