Is Your GM Truck or SUV Showing Signs of ECM Failure?
The Engine Control Module (ECM), often called the Powertrain Control Module (PCM), is the central computer of your 1998 Chevrolet Blazer, GMC Jimmy, or other compatible GM vehicle. It manages critical functions like fuel delivery, ignition timing, and transmission shifting. When it begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. If your vehicle is experiencing unpredictable behavior, a faulty computer is a very common culprit.
This is a reliable, used OEM engine computer that has been meticulously tested and is ready for service. We eliminate the need for expensive dealership visits by programming this module specifically to your vehicle’s Vehicle Identification Number (VIN) before it ships. This ensures that it communicates correctly with your vehicle’s systems right out of the box. Simply provide us with your VIN after your purchase, and we’ll handle the rest, loading it with the latest GM software updates for optimal performance and reliability.
Common Symptoms of a Failing ECM:
- ✔ Check Engine Light is illuminated, often with communication-related trouble codes (U-codes).
- ✔ The engine cranks but will not start.
- ✔ Intermittent stalling, hesitation, or rough idling that you can’t seem to solve.
- ✔ A noticeable decrease in fuel economy and engine power.
- ✔ Erratic or harsh shifting from the automatic transmission.
- ✔ Misfires or failure of fuel injectors to pulse correctly.
Direct Replacement 1998 Blazer S10 ECM
This module is a direct replacement for multiple OEM part numbers, including 09366810, 09355699, 16266645, 16250279, and 16258815. It is compatible with a vast range of 1998-1999 GM trucks, vans, and SUVs, from the Chevy S10 and GMC Sonoma to the Tahoe, Suburban, and Express/Savana vans. Please verify your part number and consult the detailed fitment list to ensure compatibility. By purchasing this pre-programmed 1998 Blazer S10 ECM, you are getting a cost-effective and dependable solution to restore your vehicle’s performance and driveability.
From the Diagnostic Bay
We had a ’98 GMC Jimmy S15 towed in that was driving the owner crazy. It would die randomly at stoplights and sometimes wouldn’t restart for an hour. We checked fuel pressure, spark, and sensors—all seemed fine. After ruling everything else out, we connected a scope to the ECM outputs and found the injector driver circuit was dropping out intermittently. Swapping in a programmed ECM like this one had the truck running perfectly in under 30 minutes. It’s often the last thing people suspect, but a failing computer can cause the most elusive problems.
Installation is straightforward. In most cases, after installing your newly programmed 1998 Blazer S10 ECM, the vehicle will start and run correctly. However, some vehicles may require a simple security relearn procedure (also known as a CASE relearn) to sync the new module with the anti-theft system. This can typically be performed with a specific key-cycling procedure or a capable bi-directional scan tool.
Frequently Asked Questions
What information do you need from me after I purchase?
After you place your order, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship the module without it.
Is this a new part?
No, this is a genuine, used OEM part sourced from a salvaged vehicle. It has been thoroughly tested to ensure it is fully functional before being programmed for your vehicle.
Will this ECM be ‘plug and play’?
Yes, because we program it to your VIN, it is designed to be plug-and-play. Some GM vehicles may require a simple security relearn procedure, which involves a series of key turns. Instructions can be easily found online for your specific model.
Where can I find my VIN?
Your VIN can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Does this part fit vehicles other than the 1998 Blazer?
Absolutely. This ECM fits a wide variety of GM trucks and vans from 1998-1999. Please review the comprehensive fitment list on this page to confirm it is the correct part for your specific make, model, and engine.