Is Your GM Truck or SUV Running Rough?
If your 1998 Chevrolet Blazer, GMC Jimmy, or another compatible GM vehicle is experiencing frustrating issues like a persistent check engine light, erratic shifting, stalling, or a complete no-start condition, a faulty Powertrain Control Module (PCM) is a very likely culprit. This computer is the brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shift points. When it fails, the symptoms can be widespread and confusing. This genuine, used GM PCM, part number 9366810, is the reliable and cost-effective solution to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
We had a ’98 GMC Jimmy S15 towed in that had every symptom in the book. The owner had replaced the fuel pump, spark plugs, and ignition coil, but it would still crank and never start. After confirming fuel pressure and spark, we hooked up our scanner and couldn’t communicate with the PCM. That’s a classic sign of a dead module. We located the PCM on the passenger side firewall, checked the connectors for corrosion (they were clean), and confirmed power and ground to the module. All signs pointed to internal failure. We installed one of these VIN-programmed PCMs, performed the quick security relearn procedure, and the truck fired up on the first try and ran perfectly. It saved the customer from chasing phantom issues and got their reliable Jimmy back on the road.
Key Features of This Programmed PCM
This isn’t just a used part pulled from a shelf. We take the extra steps to ensure this module is ready for installation in your specific vehicle, saving you a trip to the dealership and expensive programming fees. Your vehicle’s brain, restored.
- ✔ VIN-Specific Programming: We flash this module with the latest GM software updates specifically for your vehicle’s Vehicle Identification Number (VIN). This ensures all systems, including the engine, transmission, and anti-theft system, function exactly as the factory intended.
- ✔ Genuine Used GM Part: Sourced from salvaged vehicles, this is an original equipment part, ensuring perfect fitment and communication with your vehicle’s other electronic modules.
- ✔ Cost-Effective Repair: Avoid the high cost of a new module from the dealership. This is a budget-friendly way to get your truck or van running right again.
- ✔ Broad Compatibility: This module, identified by service number 9355699, fits a wide range of 1998-1999 GM trucks, vans, and SUVs. Please verify your original part number for a guaranteed match.
Common Symptoms of a Failing 1998 Blazer S10 PCM
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s time to inspect your engine computer:
- ✔ Check Engine Light is on with various communication or sensor codes (e.g., U-codes, P0601-P0606).
- ✔ Engine cranks but will not start.
- ✔ Rough or unstable idle.
- ✔ Stalling for no apparent reason.
- ✔ Poor fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions test.
Installation and Setup
Replacing the PCM is a straightforward process for a DIY mechanic. It is typically located in the engine bay. The process involves disconnecting the vehicle’s battery, carefully unplugging the electrical connectors from the old module, unbolting it, and installing the new one in its place. After installation, you may need to perform a simple security relearn procedure (often called a Passlock relearn), which can usually be done without special tools. Instructions for this procedure are widely available online for your specific model.
IMPORTANT: After purchasing, you MUST provide us with your 17-digit VIN. We cannot ship your part until we have programmed it. This step is critical for ensuring the module works correctly in your vehicle.
Frequently Asked Questions
Why do you need my VIN to program the PCM?
Your vehicle’s VIN (Vehicle Identification Number) contains critical information about its specific options, engine size, transmission type, and emissions equipment. Programming the PCM with your VIN ensures that the software loaded onto the module is an exact match for your vehicle’s factory configuration, allowing all systems to work together correctly.
Is this part difficult to install?
For most models this PCM fits, the physical installation is relatively simple. It usually involves disconnecting the battery, removing a few bolts, and swapping electrical connectors. The most important post-installation step is the security relearn procedure, which pairs the new module to your vehicle’s anti-theft system. This procedure typically takes 10-30 minutes and does not require a scan tool.
How do I find my original part number?
Your original PCM’s part number is printed on a sticker on the module itself. You will need to locate the module in your vehicle (often on the firewall or inner fender) and read the number from the label. Matching this number to our compatible list (09355699, 16266645, 9366810, etc.) is the best way to ensure you are ordering the correct part.
What happens if I install this without it being programmed?
An unprogrammed PCM will likely result in a no-start condition. The vehicle’s anti-theft system will not recognize the module, and the software may not be correct for your engine or transmission, preventing proper operation. Our pre-programming service is essential for a successful repair.
Is this a new part?
No, this is a genuine, used OEM part that has been sourced from a salvaged vehicle. It has been tested and is fully functional. We then program it with the latest software for your vehicle before shipping.