Restore Peak Performance to Your GM Truck or SUV
Is your 1998 Chevy Blazer, GMC Jimmy, or another GM truck from that era running rough, stalling unexpectedly, or refusing to start? Are you battling a persistent Check Engine Light that won’t go away? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. Don’t let a faulty computer keep your reliable truck off the road. This genuine, used GM PCM is the definitive solution to restore your vehicle’s original performance and reliability.
This isn’t just a replacement part; it’s a complete service. We flash this module with the latest official GM software updates specifically for your vehicle. By providing us with your Vehicle Identification Number (VIN) at checkout, you receive a PCM that is precisely calibrated for your truck’s engine, transmission, and emissions equipment. This critical step ensures seamless integration, proper function, and often resolves issues that older software couldn’t.
From the Diagnostic Bay
I once had a ’99 Tahoe in the shop with the most frustrating intermittent stalling issue. The owner had already replaced the fuel pump, crank sensor, and ignition coil based on advice from forums. The truck would run fine for days, then die at a stoplight without warning. After hours of diagnostics, we traced it to a PCM that was failing only when it got hot. We installed a VIN-programmed module just like this one, and the problem was solved instantly. The customer was thrilled to have his reliable Tahoe back. It’s a powerful reminder that the PCM is the brain, and when it’s not right, nothing else will be.
Diagnosing a Faulty 1998 Blazer S10 PCM
A failing PCM can manifest in numerous ways, often mimicking other sensor or component failures. If you’re experiencing any of the following symptoms, your engine computer is a likely culprit. This module is the correct replacement to resolve these common problems and get your vehicle operating as it should.
Common Symptoms of PCM Failure:
- ✔ Check Engine Light: The light is on, and you may have communication error codes or false sensor codes.
- ✔ No-Start or Hard-Start: The engine cranks but won’t start, or takes an excessive amount of time to fire up.
- ✔ Stalling and Rough Idle: The engine may stall unexpectedly while driving or at idle, and the idle may be erratic or rough.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in your vehicle’s MPG can be caused by incorrect fuel and air mixture calculations from a faulty PCM.
- ✔ Erratic Transmission Shifting: The transmission may shift harshly, at the wrong times, or not shift at all.
- ✔ Failed Emissions Test: The PCM controls the emissions systems, and a failure will almost certainly cause you to fail a smog check.
Guaranteed Compatibility and Simple Installation
This PCM, identified by part numbers 9366810 and 09355699, is a direct-fit replacement for a wide range of 1998 and 1999 General Motors trucks, vans, and SUVs. Because we program it to your VIN, it arrives ready to be installed. While the physical swap is straightforward, please be aware that a security relearn procedure (often called Passlock or Passkey) may be required after installation. This is a simple procedure that can typically be done without special tools and ensures the vehicle’s anti-theft system recognizes the new computer.
Frequently Asked Questions
Why do I need to provide my VIN?
Your vehicle’s VIN (Vehicle Identification Number) allows us to load the exact, correct GM factory software for your specific engine, transmission, and options. This ensures perfect compatibility and function, eliminating guesswork and potential issues.
Is this part difficult to install?
The physical installation is typically very simple. It involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it, and then installing the new one in reverse order. The most common additional step is a security relearn procedure, which can usually be performed by the owner.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM, then yes, this part will resolve the issue. It’s crucial to properly diagnose the vehicle first to ensure the PCM is the root cause and not a faulty sensor or wiring problem.
What is the difference between a PCM, ECM, and ECU?
These terms are often used interchangeably. ECM (Engine Control Module) and ECU (Engine Control Unit) typically refer to a computer that only controls the engine. A PCM (Powertrain Control Module) is an integrated unit that controls both the engine and the transmission, which is what this GM vehicle uses.
This is a used part. Is it reliable?
Yes. This is a genuine OEM (Original Equipment Manufacturer) part sourced from a salvaged vehicle. OEM parts are known for their superior quality and durability compared to aftermarket alternatives. We inspect each unit and program it with the latest software, ensuring it is ready for many more years of service.