Is Your Van Running Rough? Restore Its Performance Today!
The Powertrain Control Module, or PCM, is the electronic brain of your 1998-1999 Chevrolet Express or GMC Savana Van. It meticulously manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When this critical component begins to fail, it can cause a cascade of frustrating and often confusing problems, leaving your reliable workhorse dead in its tracks. This genuine, road-tested OEM PCM is the definitive solution to get your vehicle running smoothly and efficiently again.
Unlike generic, one-size-fits-all modules, this unit is specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN) before it ships. This crucial step ensures that the computer has the correct software and calibrations for your van’s specific engine, transmission, and options. We install the latest GM-released software updates, which can resolve factory bugs and improve overall performance and drivability. This VIN-matching service eliminates guesswork and complex programming hassles, making the installation process as simple as possible.
From the Diagnostic Bay
We had a ’99 Savana 2500 in the shop that was driving the owner crazy. It would randomly stall at stoplights, but never threw a consistent code. We checked fuel pressure, sensors, and wiring for days. On a hunch, we connected a scope to the PCM’s main power and ground feeds and saw intermittent voltage drops internally. We swapped in a VIN-programmed PCM just like this one, and the problem vanished instantly. The van ran smoother than it had in years. Sometimes, the most elusive electrical gremlins live inside the main computer, and a direct replacement is the only surefire fix.
Common Symptoms of a Failing Express 2500 Van PCM
If you’re experiencing any of the issues below, a faulty engine computer could be the culprit. A failing PCM can mimic many other problems, but if you’ve checked the basics, it’s time to consider the core controller.
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Engine stalling, stumbling, or misfiring, especially when warm
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Complete no-start or no-spark condition
- ✔ Poor fuel economy and loss of power
- ✔ Communication errors with diagnostic scan tools (e.g., “No Communication with PCM”)
- ✔ Inconsistent or non-functional gauges on the instrument cluster
The Right Part, Programmed and Ready
This PCM, identified by hardware ID 09355699 and service number 16250279, is a direct-fit replacement for a wide range of GM trucks and vans from the late 1990s. We take a quality, used OEM unit and flash it with the correct software for your vehicle. This provides the reliability of a genuine factory part without the high dealership price tag. After placing your order, simply provide us with your VIN, and our technicians will handle the rest.
Installation is straightforward for a DIY mechanic or any professional shop. Once installed, you may need to perform a simple security relearn procedure (often called a Passlock or VATS relearn), which typically involves a series of key cycles. This ensures the new PCM communicates correctly with your vehicle’s anti-theft system. Instructions for this procedure are widely available and easy to follow.
Frequently Asked Questions
Why do I need to provide my VIN?
Your vehicle’s VIN (Vehicle Identification Number) allows us to load the exact GM factory software and calibrations for your specific engine, transmission, and emissions equipment. This ensures perfect compatibility and function right out of the box.
Is this part truly plug-and-play?
Yes, it is programmed and ready for installation. However, on many GM vehicles of this era, you may need to perform a security relearn procedure so the PCM can sync with your anti-theft system. This usually takes about 30 minutes and only requires your ignition key.
How can I be sure my old PCM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a professional diagnosis. Common issues to rule out first include bad grounds, faulty sensors (like crank or cam sensors), and fuel delivery problems. If all other components check out, the PCM is the likely cause.
Will this PCM fit other vehicles besides the Express 2500?
Yes. This PCM, identified by hardware ID 9355699, is compatible with a wide range of 1998-1999 GM trucks and vans, including the Chevy/GMC Pickups (1500/2500/3500), Suburban, Tahoe, Yukon, and more. Please check the detailed fitment list on this page to confirm compatibility.
What is the benefit of a used OEM part?
Used OEM parts offer the original manufacturer’s quality and durability at a fraction of the cost of a new part from a dealer. Each unit is sourced from a salvaged vehicle and thoroughly inspected to ensure it is a reliable and effective replacement.