Is Your GM Truck or SUV Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition in your 1998 Chevrolet Blazer, GMC Jimmy, or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the electronic brain of your vehicle, controlling everything from fuel injection and ignition timing to transmission shift points. When it fails, the symptoms can be widespread and difficult to diagnose. Don’t let a faulty computer keep your reliable truck off the road. This is your direct-fit, plug-and-play solution.
From the Diagnostic Bay
We had a ’98 GMC Jimmy S15 come into the shop that had its owner completely stumped. It would start and run, but it shifted harshly between first and second gear and would randomly stall at red lights. The check engine light was on, but the codes were intermittent and pointed to multiple sensors. The owner had already replaced the throttle position sensor and the idle air control valve with no luck. After hooking up our scanner and monitoring live data, we saw that the PCM was sending erratic signals to the transmission solenoids and fuel injectors. We sourced a quality used module, programmed it to the Jimmy’s VIN, and performed the quick security relearn. The truck immediately ran like new—smooth shifts, stable idle, and no more stalling. It’s a classic case of a failing PCM causing ghost-like symptoms that can lead you down an expensive rabbit hole of replacing perfectly good parts.
Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL)
- ✔ Vehicle refuses to start or stalls intermittently
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A significant drop in fuel efficiency
- ✔ Engine misfires, stumbling, or poor performance
- ✔ Failure to pass emissions testing
- ✔ Communication errors with diagnostic scan tools
The Simple, Reliable Solution for Your Vehicle
Replacing the PCM on these older GM vehicles used to mean a costly trip to the dealership for the part and specialized programming. We’ve eliminated that hassle. This is a genuine, road-tested used PCM that we program specifically for your vehicle before it ever leaves our facility. All you have to do is provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number) during checkout. We handle the rest.
Our technicians will flash the module with the latest GM-certified software calibration for your exact make, model, and engine configuration. This ensures that your engine and transmission perform exactly as the manufacturer intended, restoring lost power, fuel economy, and drivability. This is not a generic, one-size-fits-all part; it’s a component precisely matched to your truck or SUV.
Solving Drivability Issues with a 1998 Blazer S10 PCM
For owners of these classic SUVs and trucks, finding a reliable electronic component can be a challenge. Our pre-programmed 1998 Blazer S10 PCM is the most effective way to solve complex electronic issues. By installing a module that is already flashed with your vehicle’s specific data, you bypass the need for expensive scan tools or dealership appointments. The installation is straightforward for any DIY mechanic, and in most cases, a simple security relearn procedure (often called a CASE relearn) is all that’s needed to get your vehicle running perfectly again. This process typically involves a sequence of key turns and can be done in your own driveway.
This module, identified by part numbers 09366810 and 09355699, has a wide range of compatibility across the GM lineup from 1998-1999, including the Tahoe, Suburban, C/K pickups, and Express/Savana vans. Please verify your part number and consult the detailed fitment list to ensure this is the correct computer for your vehicle.
Do I need to program this computer?
No. We program the computer for you using the VIN you provide before we ship it. It will arrive ready to be installed in your vehicle.
Is this a new part?
No, this is a high-quality, tested, and fully functional used part sourced from a salvaged vehicle. Each unit is inspected to ensure it is ready for programming and long-term service.
What is a VIN and why do you need it?
The VIN is your vehicle’s unique 17-digit identification number, found on your dashboard, driver’s side door jamb, and registration. We use the VIN to load the exact factory software and calibrations for your specific engine, transmission, and options, ensuring perfect compatibility.
Will I need to do anything after I install it?
In most cases, you will need to perform a security relearn procedure, also known as a Crankshaft Variation Relearn or CASE relearn. This synchronizes the new PCM with your vehicle’s anti-theft and engine sensor systems. This procedure can typically be done without special tools and instructions are widely available online.
How do I know for sure that my PCM is the problem?
While the symptoms listed above are strong indicators, it’s always best to have a professional diagnosis. However, if you’ve ruled out other common issues (like sensors, wiring, and fuel delivery) and are experiencing multiple, seemingly unrelated electronic problems, the PCM is the most likely cause.