Is Your GM Truck or Van Experiencing Mysterious Issues?
If your late-90s Chevrolet, GMC, or Isuzu is suffering from erratic behavior like stalling, poor fuel economy, a persistent check engine light with confusing codes, or a complete no-start condition, the problem may lie with its electronic brain: the Powertrain Control Module (PCM). This central computer manages everything from fuel injection and ignition timing to transmission shifting. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. Don’t let a faulty computer keep your reliable truck off the road. This is your direct-fit, VIN-programmed solution.
From the Diagnostic Bay
I once had a ’98 Chevy C1500 in the shop that was driving the owner crazy. It would start fine cold, but after 15 minutes of driving, it would start bucking and misfiring, eventually stalling. No specific sensor code would stick. We checked fuel pressure, ignition components, and wiring harnesses for hours. On a hunch, I put a scope on the injector control signals from the PCM. Sure enough, once the module got warm, the signals became erratic. These older PCMs can develop internal solder joint fractures that only show up under thermal expansion. A replacement, VIN-programmed PCM like this one had the truck running perfectly in under an hour. Sometimes, the simplest solution is the right one.
Common Symptoms of a Failing GM PCM
- ✔ Check Engine Light is on with multiple, unrelated trouble codes (e.g., sensor and transmission codes simultaneously).
- ✔ Vehicle refuses to start or stalls intermittently, especially when warm.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine misfires, stumbles, or runs rough.
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ Loss of spark or fuel injector pulse.
The Direct Solution: A VIN-Programmed 1998 S10 PCM
This isn’t just a used part pulled from a vehicle. This is a complete service designed to get you back on the road quickly and affordably. We take a genuine, tested OEM Powertrain Control Module and flash it with the latest official GM software calibration specifically for your vehicle. By providing us with your Vehicle Identification Number (VIN) during checkout, you ensure that the computer you receive is a perfect match for your truck’s engine, transmission, and factory options. This eliminates guesswork and the need for expensive trips to the dealership for programming.
This module is a direct replacement for multiple part numbers, including 16250279, 09355699, 16266645, 9355699, 16258815, 09366810, and 9366810. It fits a wide range of popular GM trucks and vans from 1998 and 1999, including the S10, Blazer, Suburban, Tahoe, Express, Savana, and more. Please verify your original part number or consult the detailed fitment list to confirm compatibility.
Installation is straightforward. Once you receive the module, simply disconnect your battery, swap the old unit for the new one, and reconnect the battery. For most vehicles of this era, you will need to perform a simple security relearn procedure, which can typically be done without special tools. This ensures the new PCM communicates correctly with your vehicle’s anti-theft system.
Frequently Asked Questions
Do I need to have this computer programmed?
No! That’s the best part of our service. We program the computer for you using the VIN you provide before we ship it. It arrives ready for installation.
Is this a plug-and-play installation?
It’s very close. After installing the module, you will need to perform a security relearn procedure. This procedure pairs the new computer to your vehicle’s anti-theft system and can usually be done in your driveway by cycling the ignition key. Instructions are widely available online for your specific model.
Where is the PCM located on my vehicle?
On most trucks and SUVs like the S10, Blazer, Tahoe, and pickups, the PCM is located in the engine compartment, often on the driver’s side fender well. On vans like the Express and Savana, it’s typically found in the LH rear engine compartment.
What information do you need from me?
After you complete your purchase, we just need the 17-digit Vehicle Identification Number (VIN) from your vehicle. You can find this on your dashboard (visible through the windshield) or on your vehicle’s registration or insurance card.
My original part number isn’t 16250279, but it’s on the list. Will this work?
Yes. GM often uses several part numbers for the same component. As long as your original part number is included in our interchange list (e.g., 09355699, 16266645), this module is the correct replacement for your vehicle.