Is Your 1998 Blazer or Jimmy Running Rough?
If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or even a no-start condition in your 1998 Chevy Blazer S10 or GMC Jimmy S15, a failing Powertrain Control Module (PCM) is a very likely culprit. Over time, the original electronics in these modules can break down from heat and vibration, leading to frustrating and hard-to-diagnose issues. Don’t keep throwing parts at the problem. This is the direct, reliable fix you need to get your truck running right again.
The Smart Solution: A VIN-Programmed Replacement
This isn’t just a used part pulled from a yard. This is a tested, working OEM engine computer that we program specifically for your vehicle before it ships. By providing your Vehicle Identification Number (VIN), we flash the module with the latest GM-approved software calibrations for your exact configuration. This ensures proper communication between the engine, transmission, and all other vehicle systems.
- ✔ Guaranteed Compatibility: Programmed to your VIN for a perfect match.
- ✔ Simple Installation: Arrives ready to install, no trip to the dealer needed for programming.
- ✔ Restores Performance: Solves common issues like poor fuel economy, rough idle, and shifting problems.
- ✔ Cost-Effective Repair: A reliable, affordable alternative to a new dealership part.
Real-World Tech Story
“A customer’s 1998 Jimmy S15 came into my shop last month. It would crank but not start, and when it occasionally did, it would stall within minutes. They had already replaced the fuel pump and filter, convinced it was a fuel delivery issue. After checking for spark and fuel pressure, which were intermittent, I hooked up my scan tool. It kept losing communication with the PCM. That was the red flag. We swapped in a programmed PCM, and it fired right up and ran perfectly. The original module’s internal driver for the fuel pump relay had failed—a classic symptom I’ve seen on dozens of these GM trucks from this era.”
Easy Plug-and-Play Installation Guide
Installing your replacement 1998 Blazer S10 PCM is a straightforward job you can do with basic hand tools. On the Blazer, Jimmy, Envoy, and Bravada, the module is typically located in the engine bay on the passenger side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: Find the module on the right-hand (passenger side) of the engine compartment, usually near the firewall or inner fender.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. Inspect the pins and terminals for any corrosion or damage. Clean them with electrical contact cleaner if necessary.
- Remove Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install New Module: Bolt the new, programmed PCM into place.
- Reconnect Everything: Firmly plug the wiring harnesses into the new module until they click. Reconnect the negative battery terminal.
- Final Step: Your vehicle is now ready to start. The security system may require a simple relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Part Number Compatibility
This computer is a direct replacement for several part numbers. If your original module has service number 9355699 or any of the following part numbers, this unit will work for your vehicle after programming:
Interchangeable Part Numbers: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810