Is Your GM Truck Acting Up? Get a Reliable, Programmed Solution.
If you’re dealing with a no-start condition, erratic engine behavior, harsh shifting, or a persistent check engine light on your 1998 Chevrolet Blazer, GMC Jimmy, or another compatible GM truck, a failing Powertrain Control Module (PCM) is often the culprit. Over my 20+ years in the bay, I’ve seen countless owners replace perfectly good sensors, only to find the root problem was the vehicle’s computer all along. This isn’t just a part; it’s the brain of your engine and transmission, and when it fails, it can cause a cascade of confusing issues.
From the Shop Floor: “A customer’s ’98 Jimmy S15 came in last week with a P0300 random misfire code that had them chasing their tail for weeks. They’d replaced plugs, wires, cap, and rotor. The scanner showed inconsistent injector pulse widths. We suspected the PCM, and after swapping in a known-good unit, the truck ran perfectly. The original PCM’s injector driver circuits were failing intermittently under heat—a common issue in these modules after decades of service. This replacement part is the exact fix for that scenario.”
The Smart Fix: A VIN-Programmed PCM Ready for Installation
Forget the hassle and high cost of a dealership visit. This is a quality, road-tested used PCM pulled from a salvaged vehicle that we program specifically for your truck. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our technicians will flash the module with the latest, most stable GM factory software for your exact vehicle configuration. It arrives at your door ready to install.
- ✔ VIN Programmed Service: We handle the complex programming, ensuring 100% compatibility.
- ✔ Latest GM Updates: Your module comes loaded with software improvements for drivability and performance.
- ✔ No Dealer Required: This is a direct-fit replacement that you can install yourself, saving you time and money.
- ✔ Solves Common Problems: An effective solution for issues like false sensor codes, poor fuel economy, and transmission shifting problems.
Easy Installation Guide for Your 1998 Blazer Jimmy PCM
Replacing the PCM is a straightforward job you can do with basic hand tools. On most S-10 Blazers and Jimmys, you’ll find it in the engine compartment on the passenger side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: Find the existing PCM. It’s a metal box with several large multi-pin electrical connectors.
- Disconnect Connectors: Carefully unlatch and remove all electrical connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove Old PCM: Unbolt the mounting brackets holding the old module in place and remove it from the vehicle.
- Install New PCM: Mount your new, programmed PCM in the same location and secure it with the original bolts.
- Reconnect Everything: Firmly plug the electrical connectors into the new module until they click and lock into place. Reconnect your battery terminal.
- Final Check: Turn the key to the ‘On’ position for 10-15 seconds before starting the engine. This allows the system to initialize. Start the vehicle and check for proper operation.
Expert Pro Tip: Before you install your replacement PCM, take a moment to inspect the harness connectors. Use a small pick and a flashlight to check for any green corrosion or bent pins inside the plug. A poor connection is the #1 reason for a ‘new’ module not to work correctly. Cleaning the terminals with a dedicated contact cleaner can prevent a world of headaches.
Guaranteed Compatibility and Part Number Information
This Electronic Control Module is a direct replacement for several original equipment part numbers. If your existing module has one of the following numbers on its label, this part is a guaranteed fit. The service ID for this family of computers is typically 09355699 or 16266645.
Interchangeable Part Numbers: 09355699, 16266645, 16250279, 16258815, 09366810, 9366810
This module fits a wide range of 1998 and 1999 GM Trucks and SUVs equipped with gasoline engines, including but not limited to:
- Chevrolet Blazer & GMC Jimmy S-15 (1998)
- Chevrolet S10 & GMC Sonoma (1998)
- Oldsmobile Bravada & GMC Envoy (1998)
- Chevrolet Astro & GMC Safari Van (1998)
- Chevrolet & GMC Pickups 1500/2500/3500 (1998-1999)
- Chevrolet Tahoe & GMC Yukon (1998-1999)
- Chevrolet Suburban (1998-1999)
- Cadillac Escalade (1999)
- Chevrolet Express & GMC Savana Vans 1500/2500/3500 (1998-1999)
- Isuzu Hombre (1998)
Please verify your part number or contact us with your VIN to ensure you are ordering the correct part for your vehicle.