Is Your GM Truck or Van Running Rough?
If you’re dealing with a persistent Check Engine Light, erratic engine behavior, stalling, or a no-start condition in your 1998 or 1999 GM vehicle, a failing Powertrain Control Module (PCM) is a very likely culprit. As the central computer for your engine, the PCM controls everything from fuel mixture and ignition timing to transmission shifting. When it fails, the symptoms can be frustrating and difficult to diagnose. I’ve seen countless vehicles from this era in my shop, and a faulty PCM can mimic a dozen other problems, costing you time and money on unnecessary parts.
The Direct Solution: A VIN-Programmed PCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We are offering a reliable, used OEM PCM that has been meticulously tested and then programmed specifically to your vehicle’s Vehicle Identification Number (VIN). This means it arrives at your door with the latest factory software from General Motors, tailored to your truck’s exact specifications. Forget about expensive trips to the dealership for programming—this module is truly plug-and-play.
Key Benefits of This Module:
- ✔ VIN-Specific Programming: We flash the module with the newest GM calibration for your exact vehicle, ensuring perfect compatibility and performance.
- ✔ No Additional Programming Needed: Save hundreds of dollars and the hassle of a dealer visit. This module is ready for installation right out of the box.
- ✔ Resolves Common Issues: Effectively corrects problems like false sensor codes, harsh shifting, poor fuel economy, and intermittent stalling.
- ✔ Broad Compatibility: This unit, service number 09366810, directly replaces a wide range of part numbers, including the common ID 9355699.
Expert Pro Tip: Check Your Grounds First!
Before you replace your PCM, do a quick visual inspection of the main ground straps. On these late-90s GM trucks, a corroded or loose ground from the engine block to the frame or firewall can cause voltage drops that make the PCM behave erratically. I’ve seen this many times—a 10-minute fix with a wire brush and a wrench can sometimes save you the cost of a new module. If your grounds are clean and tight and the problems persist, the PCM is your next logical step.
Easy Installation for the DIYer
Replacing the PCM on these vehicles is a straightforward job you can do in your own driveway. While locations vary slightly, the process is generally the same.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On a 1998 S10 Sonoma PCM, it’s typically found in the engine bay, often on the passenger side near the firewall or fender. On full-size trucks and vans, it’s usually on the driver’s side inner fender.
- Disconnect the Harnesses: Carefully unclip the large electrical connectors from the old module. Inspect the pins for any corrosion and clean them with electrical contact cleaner if necessary.
- Swap the Modules: Unbolt the old PCM and secure the new, programmed module in its place.
- Reconnect and Finalize: Plug the electrical harnesses firmly into the new PCM. Reconnect the negative battery terminal. Your vehicle is now ready to start.
Guaranteed Fitment for Your Vehicle
This module is a confirmed fit for a wide array of GM trucks and vans. After purchase, simply provide us with your VIN, and we’ll handle the rest. This unit is a direct replacement for the following part numbers:
09355699, 16266645, 16250279, 16258815, 09366810, 9366810
It is compatible with many 1998-1999 models including the S10/S15/Sonoma, Blazer/Jimmy, Astro/Safari, C/K 1500/2500/3500 Pickups, Suburban, Tahoe/Yukon, Express/Savana Vans, Escalade, and more. Please verify your original part number or consult the detailed fitment list to ensure this is the correct component for your application.