Is Your 1998-1999 GM Truck or Van Running Poorly?
If your Chevrolet or GMC truck is experiencing baffling issues like stalling, erratic shifting, a persistent check engine light, or a complete no-start condition, the culprit is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM manages everything from fuel injection and ignition timing to transmission shift points. When it begins to fail, it can create a cascade of problems that are difficult to diagnose and can sideline your reliable workhorse.
This replacement PCM, part number 16250279, is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This means it arrives at your door ready for installation, loaded with the latest factory software updates from GM to ensure optimal engine and transmission operation.
From the Diagnostic Bay
We had a 1999 Chevy Suburban come into the shop that was driving the owner crazy. It would randomly stall at stoplights and had a harsh 1-2 shift that felt like being rear-ended. The owner had already replaced the fuel pump and multiple sensors with no luck. After connecting our scan tool, we noticed intermittent communication drops with the PCM. We hooked up a lab scope and saw the 5-volt reference signal fluctuating wildly. A quick swap with a known-good, programmed PCM like this one solved everything instantly. The truck ran smoother than it had in years. It’s a classic example of how a failing computer can mimic a dozen other mechanical problems.
Common Symptoms of a Failing 1998-1999 GMC 3500 PCM
A faulty PCM can manifest in numerous ways. If you’re noticing any of the following signs, it’s a strong indicator that your vehicle’s main computer needs attention:
- ✔ Check Engine Light is on with various communication or sensor-related fault codes (e.g., U-codes, P0601-P0606).
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ The vehicle fails to communicate with a diagnostic scan tool.
- ✔ Apparent loss of spark or fuel injector pulse.
The Simple, Programmed Solution
Don’t waste time and money at a dealership for expensive programming services. Our process is designed for the DIY mechanic and professional alike. This is a genuine, used OEM module sourced from a salvaged vehicle, ensuring perfect fit and function. We professionally test and then flash it with the most current GM calibration for your exact vehicle. All you need to do is provide us with your vehicle’s VIN after purchase. The module you receive will be a plug-and-play component, though a simple security relearn procedure will be necessary after installation.
Cross-Reference Part Numbers:
This module is a direct replacement for several part numbers. Please verify that your original module carries one of these numbers: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, or 9366810.
Frequently Asked Questions
Do I need to have this computer programmed?
No. We handle all the programming for you before we ship the part. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct GM software for your specific truck or van.
Is this a new part?
No, this is a high-quality, tested, and fully functional used part that has been sourced from a salvaged vehicle. This allows us to provide a reliable, cost-effective solution.
What do I need to do after I install the PCM?
After installation, you will need to perform a security relearn procedure, also known as a VATS relearn. This procedure pairs the new PCM to your vehicle’s anti-theft system and ignition key. It’s a simple process that typically takes 30 minutes and does not require special tools. Instructions can be easily found online for your specific model.
Where is the PCM located on my vehicle?
On most 1998-1999 GM full-size trucks, Suburbans, and vans, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
Will this fix my transmission problems?
In many cases, yes. The PCM controls the electronic functions of the automatic transmission, including shift timing and line pressure. If your transmission issues are electronic in nature and caused by a faulty module, this part will resolve them.
How do I provide my VIN?
You can add your VIN in the notes section during checkout or send us a message with your order number after you complete your purchase. Your VIN is typically found on a sticker on the driver’s side door jamb or on a plate on the dashboard visible through the windshield.