Is Your GM Truck or Van Running Rough?
If you’re dealing with baffling engine issues on your Chevrolet Express, GMC Savana, or other GM truck from the 1998-2002 era, a failing Powertrain Control Module (PCM) is often the culprit. This component is the central computer of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, it can cause a cascade of problems that are frustrating and difficult to diagnose, leaving you stranded and costing you money in wasted fuel and incorrect repairs.
The Brain of Your Engine’s Operation
Think of the PCM as the mission control for your engine and transmission. It takes in data from dozens of sensors—like the oxygen sensors, crankshaft position sensor, and throttle position sensor—and uses that information to make thousands of calculations per second. It then sends precise commands to actuators like fuel injectors and ignition coils. A glitch in this computer can manifest as a check engine light, poor performance, erratic shifting, or even a no-start condition. Don’t let a faulty module compromise the reliability of your workhorse vehicle.
From the Diagnostic Bay
We had a 2001 Chevy Astro van in the shop that was driving the owner crazy. It would randomly stall at stoplights, but then restart immediately. He had already replaced the fuel pump and filter, spark plugs, and wires with no luck. When we hooked up our professional scan tool, we noticed the live data for the coolant temperature sensor was jumping all over the place, even though the sensor itself was new and testing fine. This pointed to an internal fault in the PCM’s circuitry. We installed one of our VIN-programmed modules, performed the quick security relearn, and the van ran perfectly. The erratic sensor data stabilized, and the stalling issue was completely gone. It saved the customer from chasing phantom problems any further.
Your Direct-Fit 1999-2002 Express 2500 PCM Solution
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork out of the repair by programming this module specifically for your vehicle using the VIN you provide. This process ensures that the PCM has the correct software and calibrations for your engine, transmission, and specific options. It also includes the latest software updates from General Motors, which can resolve underlying drivability issues that may have existed from the factory. Getting the right 1999-2002 Express 2500 PCM is crucial for a lasting repair.
Common Symptoms of a Failing GM PCM:
- ✔ Persistent Check Engine Light (CEL) with various codes
- ✔ Engine stalling, stumbling, or hesitating
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A significant drop in fuel economy
- ✔ Complete no-start or crank-no-start condition
- ✔ Communication errors with diagnostic scan tools
- ✔ Failure to pass state emissions testing
Ordering is simple. Just add this module to your cart and provide your vehicle’s 17-digit VIN during checkout. Our technicians will handle the programming, so when the part arrives, you can install it and get your vehicle back in service quickly. This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, and 218-11787, ensuring compatibility across a wide range of GM vehicles.
Frequently Asked Questions
Do I need to program this module?
No. This PCM comes pre-programmed to your vehicle’s specific VIN. It is ready for installation right out of the box. You will need to provide your VIN upon purchase so we can perform this service for you.
Will I need to perform a security relearn procedure?
Yes, on most GM vehicles of this era, you will need to perform a simple security relearn procedure after installation. This process, often called the Passlock or VATS relearn, typically takes about 30 minutes and involves cycling the ignition key. It does not require any special tools and instructions are readily available online.
What happens if I forget to provide my VIN?
Providing your VIN is essential for us to program the module correctly. We cannot ship the part until we receive your VIN. Our customer service team will contact you after your purchase to obtain the information if it was not provided.
Is this a new or used part?
This is a high-quality, inspected, and tested used OEM component that has been professionally programmed with the latest GM software for your vehicle. It provides the reliability of an original part at a great value.
How do I confirm this is the right part for my truck or van?
The best way is to match the service number on your original module to one of the compatible part numbers listed (16263494, 16265035, etc.). You can also use the extensive fitment list on this page or contact us with your VIN, and we will be happy to verify compatibility for you.