Is Your Trusty ’98 Blazer, Jimmy, or S-Series Truck Suddenly Unreliable?
If you’re dealing with frustrating engine problems on your 1998 GM truck or SUV, you’re not alone. After 20+ years on the road, the original Powertrain Control Module (PCM) is often the root cause of issues that can seem impossible to diagnose. In my shop, I’ve seen hundreds of these late-90s GM vehicles come in with symptoms that have owners and even other mechanics chasing their tails, replacing perfectly good sensors and parts.
The PCM is the brain of your engine and transmission. When it starts to fail, it can create a cascade of confusing problems. You might be experiencing:
- โ Engine randomly stalling or shutting off while driving
- โ A hard-to-diagnose no-start condition, even with a good battery and starter
- โ Harsh or erratic automatic transmission shifting
- โ A persistent Check Engine Light that won’t go away
- โ Poor fuel economy and a noticeable loss of power
- โ Inaccurate readings from your gauges
These issues are classic signs of an aging PCM. The internal electronic components, like capacitors and processors, degrade over decades of heat cycles and vibration. Eventually, they can no longer properly manage fuel delivery, spark timing, and transmission commands, leading to the problems you’re seeing now.
Expert Pro Tip: Check Your Service Number (SERV. NO.)
Before ordering, take a moment to look at the white sticker on your original computer. You will see a “SERV. NO.” followed by a number. This module, 09366810, is a direct replacement for modules with service numbers 16250279, 09366810, or 09355699. For Blazer, Jimmy, Bravada, and similar S-series models, pay close attention to the fitment note “w/o build date opt ZN4.” This is a critical detail for ensuring compatibility. Matching this number is the most reliable way to guarantee you’re getting the right part and avoiding compatibility headaches.
The Plug-and-Play Solution: A VIN-Programmed PCM
Don’t spend another dime on unnecessary parts or diagnostic fees. This Powertrain Control Module is the direct, reliable solution to restore your vehicle’s performance and dependability. We take all the guesswork and hassle out of the process. Unlike a generic part from a salvage yard, this module comes specifically programmed for YOUR vehicle.
Hereโs how it works:
- โ You place your order.
- โ You provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number).
- โ Our technicians use your VIN to flash the module with the latest, most stable software updates directly from GM. This ensures the computer has the correct calibration for your specific engine, transmission, and factory options.
- โ We ship you a module that is 100% ready for installation. No trip to the dealership for expensive programming is required.
Installation is Straightforward
For most of these GM trucks and SUVs, replacing the PCM is a simple DIY job that takes less than an hour. On a ’98 Blazer or Jimmy, you’ll typically find it in the engine compartment on the right-hand (passenger) side. On full-size trucks and vans, it’s usually on the left-hand (driver) side. Simply disconnect the negative battery terminal, unplug the wiring harnesses from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. You’ll have fixed the core problem and restored your vehicle’s brain to perfect working order.
Guaranteed Compatibility
This module is a direct replacement for part numbers 09366810, 16250279, and 09355699. It is guaranteed to fit and function correctly in the following vehicles, provided the service number on your original module matches:
- โ 1998 Chevrolet Blazer S10 / GMC Jimmy S15: (4.3L) w/o build date opt ZN4
- โ 1998 Chevrolet S10 / GMC Sonoma: (4.3L) w/o build date opt ZN4
- โ 1998 Oldsmobile Bravada: (4.3L) w/o build date opt ZN4
- โ 1998 GMC Envoy: w/o build date opt ZN4
- โ 1998 Isuzu Hombre: (4.3L) w/o extended build date opt ZN4
- โ 1998-1999 Chevrolet/GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- โ 1998-1999 Chevrolet Tahoe / GMC Yukon (Gasoline)
- โ 1998-1999 Chevrolet/GMC Suburban (Gasoline)
- โ 1998-1999 Chevrolet Express / GMC Savana Vans (Gasoline)
- โ 1998-1999 Chevrolet Astro / GMC Safari Vans
- โ 1999 Cadillac Escalade