Is Your 1998-1999 GMC 1500 Running Rough or Refusing to Start?
If you’re dealing with baffling engine problems on your GMT400 platform truck, you know how frustrating it can be. One minute it runs fine, the next it’s stalling at a stoplight, shifting hard, or won’t start at all. You’ve likely checked the battery, the alternator, and maybe even replaced a sensor or two, but the Check Engine Light remains stubbornly on. These are classic signs that the brain of your truckโthe Powertrain Control Module (PCM)โis failing.
As a technician with over two decades of experience under the hood of these exact trucks, I’ve seen it all. The original PCMs from this era are prone to failure from years of heat cycles, vibration, and moisture getting past old seals. This leads to cracked solder joints and failing internal components, causing a host of unpredictable issues.
The Technician’s Perspective on PCM Failure
“A customer’s ’99 GMC 1500 came in last week with these exact symptoms…”
The truck had an intermittent no-start and a random cylinder misfire code that would jump around. The owner had already spent a small fortune on a new distributor, plugs, wires, and even a fuel pump. After hooking up my diagnostic scanner, I noticed the live data stream from the PCM was dropping out intermittently. We pulled the module, located on the driver’s side of the engine compartment, and found faint signs of corrosion on the main connector pins. A replacement, programmed PCM fixed every single issue in one shot. The problem wasn’t the parts; it was the computer giving them bad commands.
The Direct-Fit, Programmed Solution
Don’t keep throwing parts at your truck. This Powertrain Control Module 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 truck before it ever leaves our facility. All you need to do is provide us with your vehicle’s 17-digit VIN during checkout.
This isn’t just a replacement; it’s a correction. We flash the module with the latest available GM software updates. These updates address many of the original drivability and performance bugs that were present when your truck first rolled off the assembly line. This means you get a module that often performs better than the original ever did.
Key Benefits of This VIN-Programmed PCM:
- โ Eliminates Common Issues: A direct fix for no-start conditions, stalling, harsh or erratic transmission shifting, false sensor codes, and poor fuel economy.
- โ Plug & Play Installation: Arrives pre-programmed to your truck’s VIN. In most cases, you simply disconnect the battery, swap the module, and perform a straightforward security relearn procedure (instructions available online or in service manuals). No expensive dealer programming is required.
- โ Latest GM Software: We load the most current calibrations from General Motors, ensuring optimal engine performance, emissions compliance, and transmission function.
- โ Guaranteed Compatibility: This module is a direct replacement for several part numbers, including 16250279, 09366810, and 09355699.
Will This Fit My Vehicle?
This PCM is compatible with a wide range of 1998-1999 GM trucks, vans, and SUVs. Please verify your original part number or match your vehicle in the list below. This module fits various configurations of models like the Chevrolet/GMC 1500/2500/3500 Pickups, Tahoe, Yukon, Suburban, Express, Savana, Astro, Safari, S10, Blazer, and more. Check the ID number on your current module; if it matches 16250279, 16258815, 09366810, or 09355699, this is the correct part for you.