Get Your GM Truck Running Right Again
Is your 1998 Chevrolet Blazer, GMC Jimmy, or another compatible GM truck giving you headaches? If you’re dealing with frustrating issues like a no-start condition, intermittent stalling, erratic shifting, or a check engine light that won’t go away, a failing Powertrain Control Module (PCM) is often the culprit. I’ve seen it hundreds of times in the shop: a perfectly good engine and transmission held hostage by a faulty computer. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. This fully programmed PCM is the straightforward, reliable solution to get your vehicle back on the road with confidence.
A Technician’s Notebook: The Phantom No-Start
I once had a ’98 GMC Sonoma with the 4.3L V6 towed into my bay. The owner was at his wit’s end. It would run fine for days, then refuse to start for no reason. No spark, no fuel injector pulse. He had already replaced the crank sensor and ignition module. After checking all the basics—power and ground to the PCM—everything seemed fine. On a hunch, I lightly tapped the PCM with a screwdriver handle while my assistant cranked the engine. It fired right up. The problem was an internal solder joint failure inside the original computer, a common issue on these units after 20+ years of heat cycles. Replacing it with a quality, tested module like this one solved the problem for good. Don’t chase ghosts in the wiring; often, the simplest answer is the right one.
What Makes This PCM Different?
This isn’t just a used part pulled from a yard. It’s a complete solution. We take a tested, salvaged OEM computer and professionally flash it with the latest official GM software updates specifically for your vehicle. All you have to do is provide your Vehicle Identification Number (VIN) after purchase. This means the module that arrives at your door is ready to be installed, with no expensive trips to the dealership for programming. It’s the most efficient way to restore your engine’s performance and factory drivability.
Is Your GM Truck Showing These Signs of PCM Failure?
A failing PCM can cause a wide range of confusing symptoms. If you’re experiencing any of the following, this module is likely the fix you need:
- ✔ Engine cranks but won’t start
- ✔ Intermittent stalling, especially when warm
- ✔ Poor fuel economy and loss of power
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Check Engine Light is on with internal processor codes like P0601, P0602, or P0606
- ✔ Communication errors with scan tools
- ✔ Seemingly random sensor codes appearing and disappearing
Straightforward Installation Guide: Get Back on the Road
Installing your new 1998 Blazer S10 PCM is a job most DIYers can handle in under an hour with basic hand tools. Follow these steps for a smooth installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental power surges.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine bay, often on the driver’s or passenger’s side fender well or near the battery. It’s a silver metal box with multiple large wiring harness connectors.
- Disconnect the Harnesses: Carefully unplug the electrical connectors from the old PCM. There are typically levers or tabs that need to be released. Do not force them.
- Remove the Old Module: Unbolt the mounting bracket holding the old PCM in place and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM in the same location. Re-secure the mounting bolts.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module. You should feel or hear a click as they lock into place. Reconnect your vehicle’s negative battery terminal.
- Final Check: Turn the key to the ‘On’ position (without starting) for 10-15 seconds, then turn it off. Repeat this once more. This allows the system to recognize the new module. Now, start your engine. The vehicle is ready to drive.
Verified Vehicle Compatibility
This module is a direct replacement for service number 9366810 and other interchangeable part numbers. It is guaranteed to fit the following vehicles, provided the service number on your original module matches one listed below:
This module replaces part numbers: 09355699, 16266645, 16250279, 16258815, 9366810
This unit fits a wide range of 1998 and 1999 GM Trucks and Vans including, but not limited to:
- ✔ 1998 Blazer S10 / Jimmy S15 (4.3L)
- ✔ 1998 S10 / S15 / Sonoma (4.3L)
- ✔ 1998-1999 Chevrolet & GMC 1500/2500/3500 Pickups (Gasoline)
- ✔ 1998-1999 Tahoe & Yukon (Gasoline)
- ✔ 1998-1999 Suburban 1500/2500 (Gasoline)
- ✔ 1998-1999 Express & Savana 1500/2500/3500 Vans (Gasoline)
- ✔ 1998 Astro & Safari Vans
- ✔ 1999 Cadillac Escalade
- ✔ 1998 Oldsmobile Bravada & GMC Envoy
- ✔ 1998 Isuzu Hombre (4.3L)
Important: Please match your part number or provide your VIN to ensure compatibility. This listing is for vehicles with service ID 09355699 or one of the other compatible numbers.
Frequently Asked Questions
1998 Blazer S10 PCM
Do I need to do any programming or flashing?
No. We handle all the programming for you before we ship. This will arrive flashed with the latest GM updates and coded to your specific VIN, making it a true plug-and-play part.