Is Your GM Truck or Van Giving You Headaches?
If your late-90s Chevy or GMC is suffering from baffling issues like stalling, erratic shifting, a persistent check engine light, or a complete no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As a mechanic with over two decades of experience, I’ve seen these symptoms countless times. Drivers spend hundreds on sensors and other parts, only to find the root cause was the vehicle’s computer all along.
This isn’t just another used part. This is a fully tested, genuine GM PCM (Part ID 9355699) that we program specifically for your vehicle before it ever leaves our facility. You provide us with your Vehicle Identification Number (VIN), and we flash the module with the latest official GM software updates. This ensures your engine and transmission operate exactly as the manufacturer intended, often fixing drivability problems you didn’t even know were software-related.
Why Our Programmed PCM is the Smart Solution
- โ VIN-Programmed for Your Vehicle: We load the correct software and parameters for your specific truck or van using your VIN.
- โ Latest GM Software Updates: Benefit from improved performance and fixes that GM released after your vehicle left the factory.
- โ No Dealer Visit Required: This module is ready to install right out of the box. Skip the expensive programming fees and scheduling hassles at the dealership.
- โ Cost-Effective Repair: Get a reliable, programmed OEM part for a fraction of the cost of a new module from a dealer.
- โ Solves Common Issues: Directly addresses problems like harsh shifting, poor fuel economy, intermittent stalling, and various engine trouble codes.
From My Shop to Your Driveway
“A customer’s 1999 Suburban 1500 came in last week with these exact symptomsโit would randomly die at stoplights and had a harsh 1-2 shift that felt like being rear-ended. The codes were all over the place, pointing to multiple sensor failures, which is a classic red flag for a failing PCM. Instead of chasing ghosts, we confirmed the PCM was the issue. A pre-programmed unit like this one had him back on the road in under an hour, with the engine running smoother and the transmission shifting perfectly. It’s the most direct fix for these complex electronic problems.”
Simple, Plug-and-Play Installation
You don’t need to be a master mechanic to replace your PCM. With a few basic hand tools, you can get your vehicle running right again. The module is typically located in the engine bay for easy access.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these trucks and vans, it’s on the driver’s side, near the fender or firewall.
- Disconnect the Harnesses: Carefully unplug the large electrical connectors from the old module. Note their colors or positions if needed.
- Swap the Modules: Unbolt the old PCM and secure the new, programmed module in its place.
- Reconnect and Finalize: Plug the harnesses firmly into the new PCM, ensuring they click into place. Reconnect your battery terminal. Your vehicle is now ready to start.
Expert Pro Tip: Connector Inspection
Before you plug in your new PCM, take 30 seconds to inspect the vehicle’s harness connectors. Over 20+ years, moisture can cause faint green or white corrosion on the metal pins. This creates poor contact and can mimic a bad PCM. Use a small nylon brush and some electrical contact cleaner to gently scrub the pins clean. This simple step ensures a perfect connection and prevents future issues.
Guaranteed Compatibility for Your 1998-1999 Express 2500 PCM
This module is a direct replacement for units with Service No. 9355699. It also interchanges with the following part numbers: 09355699, 16266645, 16250279, 16258815, 09366810, and 9366810. If your original module has any of these numbers, this is the correct part for you.
It is the specified computer for a vast range of 1998-1999 GM gasoline-powered vehicles, including:
- Chevrolet Express & GMC Savana Vans (1500, 2500, 3500)
- Chevrolet & GMC Pickups (1500, 2500, 3500)
- Chevrolet Suburban, Tahoe & GMC Yukon
- Cadillac Escalade
- Chevrolet Astro & GMC Safari
- Chevrolet S10, GMC Sonoma, Oldsmobile Bravada, Isuzu Hombre (4.3L V6 models)
- And more models sharing the ID 9355699.