1998-1999 GMC 2500 PCM Powertrain Control Module 09355699 Programmed

Is Your 1998-1999 GMC 2500 Running Rough?

If you’re dealing with a persistent check engine light, erratic engine behavior, or a no-start condition on your trusty GMC 2500, the culprit is often the very brain of the operation: the Powertrain Control Module (PCM). After two decades of heat cycles, vibrations, and managing countless signals, the original PCM’s internal components can begin to fail. This isn’t just a simple wear-and-tear item; it’s the central command for your engine’s performance, fuel delivery, and emissions.

My Experience with Failing GMT400 PCMs

Over my 20+ years in automotive diagnostics, I’ve had hundreds of these classic GM trucks in my service bay. The symptoms are almost always the same. The owner reports a sudden drop in fuel economy, a transmission that seems to shift at the wrong times, or an engine that just doesn’t have the power it used to. Often, they’ve already replaced sensors and other parts, chasing a problem that lives inside the little metal box mounted in the engine bay. The internal solder joints crack, capacitors leak, and processors falter, leading to confusing and intermittent issues that can be a nightmare to diagnose without experience.

The Direct Solution: A VIN-Programmed PCM

This isn’t just a replacement part; it’s a complete solution. We take a quality, tested Powertrain Control Module and program it specifically to your truck’s Vehicle Identification Number (VIN). This is a critical step that many sellers skip. Here’s what that means for you:

• ✔ No Dealer Visit Required: Your module arrives ready for installation. Simply plug it in, and you’re good to go. No need for expensive dealership programming or towing fees.
• ✔ Latest GM Software Updates: We flash the module with the most current GM calibration for your specific VIN. This often resolves issues that were present even in the original factory software, improving drivability and efficiency.
• ✔ Guaranteed Compatibility: By using your VIN, we ensure the PCM is a perfect match for your truck’s engine, transmission, and factory options.
• ✔ Restored Performance: A new, properly functioning PCM will restore crisp throttle response, accurate fuel mixture, and correct transmission shift points.

Simple Installation Process

Replacing the PCM on these trucks is straightforward. It’s typically located on the driver’s side of the engine compartment. The process involves disconnecting the battery, unplugging the large wiring harnesses from the old module, unbolting it from its bracket, and then doing the reverse to install the new one. It’s a job most DIYers can handle in under an hour with basic hand tools.

Part Number Compatibility

This module is a direct replacement for several part numbers. If your original module has one of the following numbers, this part is a compatible replacement: 16250279, 09366810, or 09355699. Please provide your VIN after purchase so we can ensure a perfect software match.

Guaranteed Fitment For These Vehicles:

This PCM is confirmed to fit a wide range of GM trucks and vans from this era. Please verify your vehicle is on this list and that the service ID on your original module matches.

• ✔ GMC 2500 PICKUP (1998-1999): Gasoline models, ID 16250279
• ✔ CHEVROLET 2500 PICKUP (1998-1999): Gasoline models, ID 16250279
• ✔ CADILLAC ESCALADE (1999): ID 16250279
• ✔ CHEVROLET & GMC 1500/3500 PICKUP (1998-1999): Gasoline models, ID 16250279
• ✔ CHEVROLET TAHOE & GMC YUKON (1998-1999): Gasoline models, ID 16250279
• ✔ CHEVROLET & GMC SUBURBAN (1998-1999): Gasoline models, ID 16250279
• ✔ CHEVROLET ASTRO & GMC SAFARI (1998-1999): ID 16250279
• ✔ CHEVROLET EXPRESS & GMC SAVANA VANS (1998): Gasoline models, ID 16250279
• ✔ And many more S10/Blazer/Jimmy platform vehicles. Please check the detailed list for your specific model.