Restore Peak Performance to Your GM Truck with a VIN-Programmed PCM

Is your 1998 Chevy S10, GMC Sonoma, or another GM truck from that era giving you headaches? If you’re dealing with frustrating issues like intermittent stalling, a no-start condition where it just cranks, erratic shifting, or a persistent Check Engine Light that won’t go away, the culprit is often a failing Powertrain Control Module (PCM). As the electronic brain of your vehicle, when the PCM starts to fail, it can cause a cascade of problems that are difficult to diagnose. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded.

This is a dependable, tested, and pre-programmed replacement PCM that directly replaces part number 16258815 and a wide range of other compatible service numbers. We take the guesswork and high cost out of the repair by programming the module specifically for your vehicle using your VIN before it ever leaves our facility. This ensures it has the latest GM software updates and is ready for installation right out of the box.

From My 20+ Years of Experience: A customer’s ’98 S10 with the 4.3L came in last week. It would crank but not start, and the fuel pump wasn’t priming. After checking fuses and relays, we found the PCM wasn’t sending the signal to the fuel pump relay—a classic failure mode I’ve seen dozens of times on these trucks. We swapped in a VIN-programmed unit just like this one, and the truck fired right up and ran smoother than it had in years. This is a common fix that saves hours of diagnostic time.

Why Your 1998 S10 Sonoma PCM Needs Replacing

The electronic components in these late-90s modules can degrade over time due to heat cycles and vibration. This leads to common failures that can mimic other problems, costing you time and money on parts you don’t need. Our solution gets to the heart of the matter.

• ✔ VIN-Programmed for Your Truck: We flash the module with your vehicle’s specific VIN, ensuring all factory options and parameters are correctly loaded.
• ✔ Eliminates Common Failures: Solves issues like no-start, poor fuel economy, harsh shifting, and false sensor codes.
• ✔ Latest GM Software Updates: Your PCM will be loaded with the most current software from General Motors, which can resolve factory bugs and improve performance.
• ✔ Cost-Effective Solution: Avoid the high costs and programming fees associated with a dealership visit.
• ✔ Broad Compatibility: This module is a direct replacement for multiple part numbers, making it a versatile solution for many GM vehicles.

Simple Plug-and-Play Installation

You don’t need to be a master technician to install this module. With basic hand tools, you can get your truck running properly again in under an hour. Just follow these simple steps:

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any work on the electrical system.
2. Locate the PCM: On most S10/Sonoma/Blazer models, the PCM is located in the engine compartment, typically on the passenger side fender well or firewall. Full-size trucks and vans may have it on the driver’s side inner fender.
3. Disconnect the Old Module: Carefully unplug the wiring harness connectors from the old PCM. Inspect the connectors for any signs of corrosion or bent pins. If you see any green or white powder, clean it thoroughly with a dedicated electronics cleaner before proceeding.
4. Install the New PCM: Mount the replacement PCM in the same location and securely plug in the wiring harness connectors. You should hear a ‘click’ as they lock into place.
5. Reconnect the Battery: Reattach the negative battery terminal. The vehicle may need to complete a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes.

Guaranteed Compatibility

This PCM is a tested unit sourced from a salvaged vehicle and is guaranteed to function correctly once programmed for your truck. It is the correct replacement for units with the service ID 9355699 and is interchangeable with the following part numbers:

09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810

After your purchase, simply send us a message with your vehicle’s 17-digit VIN, and our technicians will handle the programming. This step is critical for ensuring a successful, hassle-free installation.