Is Your GM Truck or Van Running Rough?
If you’re dealing with a no-start condition, erratic engine performance, or a persistent check engine light on your 1998-1999 GM vehicle, a failing Powertrain Control Module (PCM) is a very common culprit. After 20+ years on the road, the original electronics in these workhorses are prone to failure from heat cycles and vibration. This isn’t just an inconvenience; it can leave you stranded. This is a reliable, tested, and pre-programmed replacement PCM that gets you back on the road without the dealership price tag or hassle.
Why Choose Our Programmed 1998-1999 Savana 2500 PCM?
We take the guesswork out of the repair. Unlike a generic module from a salvage yard that won’t work without expensive programming, this unit arrives ready for installation. We use your vehicle’s VIN to flash the module with the latest, most stable GM-approved software. This ensures all engine and transmission parameters are correct for your specific vehicle, restoring factory performance and efficiency.
Expert Pro Tip from a 20-Year Technician
Before you install your new PCM, take a moment to inspect the main connector harnesses. Over the years, the plastic can become brittle and the pin sockets can loosen, causing intermittent connection issues that mimic a bad PCM. I’ve seen this countless times in my shop. Use a small pick to gently check for any loose-fitting female pins and clean both the harness and the new module’s pins with electrical contact cleaner. This simple five-minute check ensures a solid connection and prevents future headaches.
Common Symptoms of a Failing GM PCM:
- ✔ Check Engine Light is on with communication error codes.
- ✔ Engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Stalling, stumbling, or poor acceleration.
- ✔ Noticeably poor fuel economy.
- ✔ No communication with your OBD-II scan tool.
Plug-and-Play Installation: No Dealer Visit Required
Installing this module is a straightforward job you can do in your own driveway. Here are the basic steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and vans, it’s located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect Harnesses: Carefully unclip and remove the electrical connectors from the old PCM. There are usually several color-coded plugs.
- Swap the Modules: Unbolt the old PCM from its bracket and secure the new one in its place.
- Reconnect Everything: Plug the harnesses firmly into the new module and reconnect your battery terminal.
- Security Relearn: You will need to perform a simple security relearn procedure (often called a Passlock relearn) which takes about 30 minutes and requires only the ignition key. Instructions are readily available online or we can assist.
Guaranteed Compatibility
This module is a direct replacement for several part numbers and fits a wide range of GM vehicles. Simply verify your vehicle is on the list below and that your original module carries one of the compatible service numbers. After purchase, please provide your VIN so we can ensure perfect programming.
Replaces Part Numbers: 09355699, 16266645, 16250279, 16258815, 09366810
Fits a wide variety of 1998-1999 GM models including: Chevrolet/GMC Pickups (1500, 2500, 3500), Express/Savana Vans, Suburban, Tahoe, Yukon, Astro/Safari, S10/Sonoma, Blazer/Jimmy, and more with service ID 09355699.