Is Your 1998-1999 GM Truck or Van Running Rough?
If your GMC 2500, Chevrolet Silverado, Tahoe, or Suburban is suffering from erratic behavior, poor fuel economy, or a persistent Check Engine Light, the culprit is often a failing Powertrain Control Module (PCM). As the central computer for your vehicle, the PCM manages everything from fuel injection and spark timing to transmission shifting and emissions control. When it starts to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems. Don’t let a faulty computer keep your reliable truck off the road. This is your direct, hassle-free solution.
From the Diagnostic Bay
We had a 1999 Chevy K2500 come into the shop with a complaint of harsh shifting and a random no-start condition. The owner had already replaced the fuel pump and a few sensors, but the problem persisted. After hooking up our scanner, we noticed communication dropouts with the PCM. Instead of guessing, we swapped in a known-good, programmed module. The truck fired right up, and the transmission shifted perfectly. It was the 1998-1999 GMC 2500 PCM all along. This experience highlights how a failing module can mimic other component failures, costing you time and money on unnecessary parts.
The Simple, VIN-Programmed Solution
Forget expensive dealership visits and the headache of finding a shop that can program older modules. We take the guesswork out of the repair. This is a genuine, tested OEM Powertrain Control Module, sourced from a salvaged vehicle, that will be professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. We load the latest GM-certified software updates, ensuring optimal performance and compatibility. This means when you receive the part, it’s ready for a straightforward installation.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various communication or sensor codes (e.g., U-codes, P0601, P0606).
- ✔ Engine cranks but refuses to start.
- ✔ Rough or unstable idling.
- ✔ Poor acceleration and overall loss of engine power.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ Decreased fuel efficiency for no apparent reason.
- ✔ Stalling intermittently while driving or at a stop.
- ✔ Failure to pass an emissions test.
Why Choose a VIN-Programmed OEM Module?
The PCM is not a one-size-fits-all part. Each one is programmed with specific data for your truck’s engine, transmission, emissions equipment, and even tire size. Using a generic or non-programmed module from a junkyard will result in a no-start condition or severe performance issues. Our service ensures this 1998-1999 GMC 2500 PCM arrives tailored specifically for your vehicle. We handle the complex programming so you can focus on the simple installation. This unit is a direct replacement for multiple part numbers, including 16266645, 09355699, 16250279, and more, ensuring broad compatibility across the GM truck and van lineup from that era.
Installation is typically straightforward. After disconnecting the battery, you’ll locate your old PCM in the engine bay, unplug the wiring harnesses, unbolt it, and swap in the new one. In some cases, a simple security relearn procedure (often called a CASE relearn) may be required, which can be done without special tools. This restores communication with your vehicle’s anti-theft system.
Frequently Asked Questions
Do I need to have this computer programmed by a dealer?
No. We program the module to your vehicle’s VIN before we ship it to you. It will arrive with the correct GM software and calibrations for your specific truck or van, making it ready for installation.
Is this a plug-and-play installation?
For most vehicles, yes. After installing the module, you will need to perform the vehicle’s security relearn procedure. This typically involves a sequence of key turns and waiting periods and does not require a scan tool. Instructions can be easily found online for your specific model.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add it as a note during checkout or send it to us in a message referencing your order number. We cannot ship the part without it.
Will this fix my transmission shifting problems?
A faulty PCM is a very common cause of shifting issues in these GM trucks and vans, as it directly controls the transmission’s solenoids and shift points. While not a guarantee for every situation, replacing a bad PCM often resolves these types of problems.
What if my part number is slightly different?
This module, service number 09355699, is the correct replacement for a wide range of original part numbers, including 16266645, 16250279, 16258815, and others. As long as your vehicle is listed in the compatibility chart, this programmed unit will work correctly.