Get Your Workhorse Running Right Again
When the brain of your truck or van fails, everything grinds to a halt. A faulty Powertrain Control Module (PCM) can cause a cascade of frustrating issues, from a persistent check engine light to a vehicle that won’t even start. This isn’t just an inconvenience; it’s lost time and lost productivity. This replacement PCM is the reliable, straightforward solution to get your dependable GM vehicle back on the road, performing exactly as it should.
Common Symptoms & Your Solution
If you’re experiencing issues like a constant Check Engine Light (CEL), erratic engine behavior, harsh shifting, poor fuel economy, or failing an emissions test, a failing computer is a likely culprit. Diagnostic Trouble Codes (DTCs) such as P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault) often point directly to a necessary replacement. This module is the definitive fix, arriving pre-programmed specifically for your vehicle. We take care of the complex part so you can focus on a simple installation.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: This isn’t a generic, one-size-fits-all part. We flash the module with the latest GM software using your vehicle’s specific VIN. This ensures all systems communicate correctly right out of the box.
- ✔ True Plug-and-Play Installation: Because the programming is done for you, you can avoid a costly trip to the dealership. Simply install the module, and you’re ready to go. No special tools or additional flashing required.
- ✔ Restores Original Performance: A new brain for your engine and transmission means restored fuel efficiency, smoother shifting, and the reliable power you depend on for hauling and towing.
- ✔ Direct OEM Replacement: Engineered to be a perfect match for the original unit, including OEM part number 16263494. This guarantees a perfect fit and seamless integration with your vehicle’s wiring and mounting points.
- ✔ Solves Frustrating Electrical Gremlins: Put an end to confusing diagnostic codes and unpredictable performance issues caused by a failing original PCM. This is the core of a reliable repair for your 1999-2002 Express 3500 PCM issues.
Expert Insight: Why VIN-Specific Programming Matters
As a technician, I’ve seen countless vehicle owners try to save a few dollars with a generic, unprogrammed module from a salvage yard. The result is almost always more headaches. Without the correct VIN-specific software, you can face transmission shift point errors, anti-theft system lockouts (VATS/Passlock), and incorrect fuel-air mixtures. We program this 1999-2002 Express 3500 PCM before it ships, which means we are providing a complete solution, not just a part. It’s the difference between a quick, successful repair and a week of chasing new problems.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
In most cases, this is a completely plug-and-play installation. However, for some vehicles, a Crankshaft Variation Relearn (also known as a CASE relearn) may be required to clear a P1336 trouble code. This procedure can be done with a capable bi-directional scan tool.
How do I provide my VIN?
After you complete your purchase, simply add your 17-digit Vehicle Identification Number (VIN) to the ‘notes’ section of your order. You can also reply to your order confirmation email with the VIN. We cannot ship the module until we have this information.
Is this the correct part for my truck/van?
This module fits a wide range of GM vehicles. Please review the detailed fitment list on this page and, most importantly, match the part number (16263494 or another compatible number listed) from your original module to ensure compatibility. If you’re unsure, feel free to contact us with your VIN.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. An ECM (Engine Control Module) controls only the engine’s functions. A PCM (Powertrain Control Module), like this unit, controls both the engine and the automatic transmission, making it a more integrated component.
Will this fix my check engine light?
This module will resolve any check engine light and performance issues directly caused by a faulty original computer. However, it’s crucial to properly diagnose the trouble codes first to ensure the problem isn’t with a sensor, wiring, or another component. A faulty 1999-2002 Express 3500 PCM is a common issue, but good diagnostics are key to a successful repair.