Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet Silverado, GMC Sierra, or Express van suffering from frustrating issues like a persistent Check Engine Light, erratic shifting, poor fuel economy, or a no-start condition? These are classic symptoms of a failing Powertrain Control Module (PCM), the central computer of your vehicle. Don’t let a faulty module keep your reliable truck off the road. This direct-fit replacement PCM, part number 16263494, is the definitive solution to get your vehicle running smoothly again.
This isn’t just a replacement part; it’s a fully prepared, plug-and-play solution. We professionally program the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the PCM communicates perfectly with your engine, transmission, and all other onboard systems, just as the original did from the factory. We load the latest GM-certified software updates, which can often resolve underlying drivability issues and improve overall performance and efficiency.
Diagnosing a Faulty 1999-2000 Silverado PCM
A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, it’s a strong indicator that your module may need replacement. Proper diagnosis is key, but these symptoms are the most common red flags for a bad computer.
From the Diagnostic Bay
I once had a 2000 Sierra 1500 in the shop with a whole host of bizarre electrical gremlins. The gauges would sweep randomly, it would stall at idle, and it threw a half-dozen communication codes. The customer was convinced the PCM was fried. Before ordering a new one, I did a full system check. Turns out, the main ground strap from the engine block to the frame on the passenger side was corroded and barely making contact. A $15 cable and 30 minutes of cleaning the connection points fixed everything. Always check your main power and ground connections before condemning a module—it can save you hundreds!
Common Symptoms of PCM Failure
- ✔ Persistent Check Engine Light (CEL) with communication-related trouble codes (U-codes) or multiple random sensor codes.
- ✔ Harsh or erratic automatic transmission shifting, or getting stuck in one gear (limp mode).
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Complete no-start condition where the engine cranks but will not fire up.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Failure to pass an emissions test due to module communication errors.
- ✔ Intermittent issues with gauges or other electronic components.
The VIN Programming Advantage
Ordering a 1999-2000 Silverado PCM from a dealership can be an expensive and time-consuming process, often requiring you to have your vehicle towed in for programming. We eliminate that hassle. By providing us with your VIN during checkout, you receive a module that is ready for installation right out of the box. This process ensures all factory-installed options on your specific vehicle—like engine size, transmission type, and emissions equipment—are correctly recognized. After installation, a simple security relearn procedure is typically all that’s needed to sync the new module with your keys.
This module is a direct replacement for several part numbers, including 16263494, 16265035, and 8162634940. It fits a wide array of GM trucks and vans from the late 90s and early 2000s, including the Chevrolet Silverado, Express, Tahoe, and S10, as well as the GMC Sierra, Savana, Yukon, and more. Please verify the part number and consult the detailed fitment list to ensure compatibility with your exact model.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN when you place your order, and we will load the latest GM software specific to your truck or van.
What happens after I install the module?
After installation, you will need to perform a Security Relearn Procedure (also known as a Passlock or VATS relearn). This syncs the new PCM to your vehicle’s anti-theft system. This procedure is simple, requires no special tools, and typically takes about 30 minutes. Instructions are readily available online for your specific model.
Will this fix my transmission shifting problems?
If the PCM is the cause of your shifting issues, then yes, this will resolve them. The PCM controls transmission line pressure and shift points. However, harsh shifting can also be caused by mechanical issues within the transmission. A professional diagnosis is always recommended to confirm the PCM is the point of failure.
How can I be sure this part fits my vehicle?
This module fits a wide range of GM vehicles. The best way to confirm is to match your original module’s service number to one of the compatible part numbers listed: 16263494, 16265035, 8162634940, 218-11787, or 21811787. You can also use the detailed fitment chart on this page.
Where do I provide my VIN?
You can add your VIN to the order notes during checkout. If you forget, don’t worry! We will contact you via email after your purchase to request the VIN before we begin the programming process.