Is Your GM Truck or Van Acting Up?
If you’re dealing with baffling issues like a no-start condition, erratic shifting, a persistent check engine light, or poor fuel economy, the problem might not be your transmission or fuel pump—it could be the brain of your vehicle. The Powertrain Control Module (PCM) is the central command for your engine and transmission, and when it fails, it can create a host of frustrating and often misdiagnosed problems. For your 1998-1999 workhorse, this isn’t just an inconvenience; it’s downtime you can’t afford.
The Simple, Reliable Solution: A VIN-Programmed PCM
Forget expensive dealership visits and the hassle of finding a local shop that can program a replacement module. This is a thoroughly tested, used OEM Powertrain Control Module that we program specifically for your vehicle using your VIN. We install the latest GM-certified software updates, ensuring your engine and transmission operate with the most current logic for optimal performance and efficiency. This isn’t just a replacement part; it’s a direct path to resolving your truck’s electronic issues.
A Real-World Scenario from My Shop
“A customer’s ’99 Chevy Suburban came in last week on a tow truck. It would crank but not start. They had already replaced the fuel pump and filter, but the problem persisted. After a quick diagnostic scan, I saw no communication from the PCM. Before condemning the module, I checked the basics. The harness connectors on these GMT400 trucks are notorious for collecting moisture and grime. After cleaning them with contact cleaner and a small brush, I still had no communication. That’s when I knew the PCM’s internal driver had failed—a common issue I’ve seen on hundreds of these vehicles. We installed one of our pre-programmed modules, and the truck fired up on the first try. The customer saved hundreds by avoiding a misdiagnosis and a trip to the dealer.”
Symptoms of a Failing 1998-1999 GMC 3500 PCM
A faulty engine computer can manifest in numerous ways. If you’re experiencing any of the following, a failing PCM is a likely culprit:
- ✔ Vehicle will not start or is difficult to start
- ✔ Check Engine Light is on with various communication codes
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Unexplained drop in fuel mileage
- ✔ Engine stalling or running rough for no apparent reason
- ✔ Loss of power or hesitation during acceleration
Plug-and-Play Installation: No Dealer Visit Required
We make this repair as straightforward as possible. Because we program the module to your VIN before shipping, it arrives ready to install. In most cases, you won’t need to perform any additional security relearn procedures. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect the Harness: Carefully unclip and remove the electrical connectors from the old PCM. Inspect the connectors for any signs of corrosion or bent pins.
- Swap the Module: Unbolt the old PCM from its bracket and mount the new one in its place.
- Reconnect Everything: Securely plug the wiring harnesses into your new, pre-programmed PCM. Reconnect the negative battery terminal.
- Start the Engine: Your vehicle should now start and run correctly with the new module.
Guaranteed Compatibility
This module is a direct replacement for several part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810. It is compatible with a wide range of 1998-1999 GM trucks, vans, and SUVs. By providing your VIN, you guarantee that the software loaded onto the module is a perfect match for your vehicle’s specific configuration. Get your truck back to work with a reliable, cost-effective solution.