Get Your GM Truck Back on the Road with a Reliable, Programmed PCM
Is your trusty Chevrolet, GMC, or Isuzu truck or van suddenly running rough, stalling, or refusing to start? Before you start throwing parts at it, the problem could be its brain—the Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen countless vehicles sidelined by a faulty PCM. It can cause a cascade of confusing symptoms, from a persistent check engine light to poor fuel economy and erratic transmission shifting. This isn’t just an inconvenience; it’s a critical failure that affects your vehicle’s performance and safety.
We offer a straightforward and dependable solution: a genuine, used OEM PCM, part number 09366810, that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This isn’t just a generic part off a shelf. We load it with the latest GM software updates before it ships, ensuring it communicates perfectly with your truck’s engine, transmission, and other systems. This process eliminates the need for an expensive trip to the dealership for programming, saving you time and money.
A Technician’s Notebook: The Misleading Misfire
I remember a 1998 GMC Jimmy with the 4.3L V6 that came into the shop. The owner had already replaced the spark plugs, wires, cap, and rotor chasing a random misfire (P0300) and a code for an internal memory error (P0601). The engine would run fine for a while, then suddenly start bucking and stalling. After verifying fuel pressure and spark, we connected our diagnostic scanner and watched the live data. We noticed the injector pulse width was fluctuating wildly for no reason. This pointed directly to the processor in the PCM. We swapped in a VIN-programmed module like this one, performed the security relearn, and the truck ran perfectly. The customer had spent hundreds on tune-up parts when the root cause was the computer all along. A reliable 1998 S10 PCM is often the direct fix for these baffling electronic issues.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer may need replacement:
- ✔ Check Engine Light is on with codes like P0601, P0604, or P0606.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ A noticeable drop in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ Seeming loss of power or hesitation during acceleration.
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle with basic tools. Our pre-programming makes it even simpler. While specific locations vary slightly by model (e.g., under the hood by the battery or on the fender), the general process is the same.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: Find the existing PCM in your engine bay. It’s a metal box with several large multi-pin electrical connectors.
- Disconnect the Connectors: Carefully unlatch and remove all electrical connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, VIN-programmed 1998 S10 PCM in place and secure the bolts.
- Reconnect Everything: Firmly plug the electrical connectors back into the new module. Reconnect the negative battery terminal.
- Perform Security Relearn: You will need to perform a security relearn procedure (often called a Passlock or VATS relearn) so the vehicle will start. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle’s service manual will have the exact steps.
Verified Vehicle Compatibility
This module is a direct replacement for service number 09366810 and interchanges with several other part numbers, including 09355699, 16266645, 16250279, and 16258815. It is confirmed to fit a wide range of 1998 and 1999 GM vehicles equipped with the ID 9355699. Please match your part number to ensure compatibility.
- Chevrolet S10 / GMC Sonoma (1998) w/ 4.3L V6
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada (1998)
- Chevrolet Astro / GMC Safari (1998)
- Chevrolet/GMC Pickups (1500, 2500, 3500) (1998-1999) w/ gasoline engines
- Chevrolet Suburban / Tahoe / GMC Yukon (1998-1999) w/ gasoline engines
- Cadillac Escalade (1999)
- Chevrolet Express / GMC Savana Vans (1500, 2500, 3500) (1998-1999) w/ gasoline engines
- Isuzu Hombre (1998) w/ 4.3L V6
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you. Simply provide your vehicle’s VIN during checkout, and we will flash the module with the latest GM software specific to your truck. You will, however, need to perform a simple security relearn procedure after installation.
How do I find my original part number?
Your vehicle’s original PCM will have a sticker on it with the service number. It’s crucial to match this number to one of the compatible part numbers listed (09366810, 09355699, etc.) to guarantee correct functionality.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. This provides the reliability of a genuine GM component at a significant cost saving compared to a new unit from a dealer.
What is a security relearn and is it difficult?
A security relearn syncs the new PCM with your vehicle’s anti-theft system. It’s a simple, tool-free procedure that usually involves a sequence of key turns. A quick search for ‘GM Passlock relearn’ for your model year will provide detailed instructions. It’s an essential step to allow the engine to start and run.