Is Your GM Truck or Van Running Rough?
If you’re dealing with a check engine light that won’t go away, poor fuel economy, stalling, or erratic transmission shifting in your 1999-2000 GMC 2500 or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is a very likely culprit. The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it starts to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems that can leave your reliable workhorse dead in the water.
Don’t let a faulty computer dictate your vehicle’s performance. This direct-replacement Powertrain Control Module is the definitive solution to restore your engine’s health and efficiency. We take the guesswork and hassle out of the repair process. Unlike modules from a salvage yard that require expensive dealer programming, this unit arrives at your door pre-programmed with the latest GM factory software, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless integration and optimal performance right out of the box.
From the Diagnostic Bay
We had a 2000 Chevy Express van come in that was driving the owner crazy. It had a persistent random misfire code (P0300) and would occasionally stall at stoplights. The owner had already replaced the spark plugs, wires, cap, and rotor twice. He even replaced the fuel pump. After hours of diagnostics, we traced the issue to the PCM. The internal drivers for the ignition coil were failing intermittently under heat. We installed one of our VIN-programmed modules, performed the quick security relearn, and the van ran perfectly. It’s a classic case where mechanics chase their tails replacing good parts when the vehicle’s brain is the actual problem.
Diagnosing a Faulty 1999-2000 GMC 2500 PCM
A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing several of the following symptoms, it’s a strong indicator that your module needs replacement. This module is a direct fit for a wide range of GM trucks and vans, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Express, and Savana vans. Always verify your part number (16263494 is a common one for this series) to ensure compatibility.
Common Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling or cutting out unexpectedly.
- ✔ Rough idling or misfires that aren’t resolved by new plugs or coils.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ A no-start condition where the engine cranks but will not fire.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to pass state emissions testing.
The Simple, Reliable Solution
Our process is designed for both professional technicians and savvy DIYers. Here’s how it works:
- Place Your Order: Add this module to your cart and complete the checkout process.
- Provide Your VIN: After your purchase, you will need to provide us with your 17-digit VIN. This is crucial for correct programming.
- We Program It: Our technicians will flash the module with the latest official GM calibration for your specific vehicle. This ensures all systems function as the factory intended.
- Plug and Play Installation: Once you receive the module, simply disconnect your battery, swap the old module with the new one, and reconnect the battery. In most cases, you will need to perform a simple security relearn procedure (often called a CASE relearn), which can typically be done without special tools and takes about 30 minutes. Instructions are readily available online for this common procedure.
By providing a module programmed specifically for your 1999-2000 GMC 2500 PCM, we eliminate the need for costly dealership visits or specialized programming tools, saving you time and money and getting you back on the road faster.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s VIN after purchase, and it will arrive ready for installation.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your specific vehicle. It contains information about the engine, transmission, and other factory-installed options. We use it to load the exact correct software from GM for your vehicle’s configuration.
Where is the PCM located on my truck or van?
On most GM trucks and SUVs from this era (like the GMC 2500, Silverado, Tahoe), the PCM is located in the engine compartment on the driver’s side, often near the battery or firewall. On Express and Savana vans, it’s typically found in the rear of the engine compartment on the driver’s side.
Will I need to do anything after installing the module?
You will likely need to perform a security relearn procedure, also known as a Crankshaft Variation Relearn or CASE relearn. This synchronizes the new PCM with your vehicle’s anti-theft and sensor systems. The procedure is simple and can usually be done without special tools.
Is this compatible with part number 16263494?
Yes. This module is a direct replacement for multiple service numbers, including the very common 16263494, as well as 16265035 and 8162634940.