Restore Your Truck’s Brain and Get Back on the Road
Is your 1998 Chevrolet S10, GMC Sonoma, or another classic GM truck giving you headaches? If you’re dealing with frustrating issues like stalling, erratic shifting, a persistent check engine light, or a no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can cause a cascade of problems that are often misdiagnosed. This is a reliable, tested, and pre-programmed replacement PCM, service number 9355699, designed to get your vehicle running smoothly again without a costly trip to the dealership.
Case Study: A Tricky Diagnosis
I remember a 1998 GMC Jimmy that came into my shop. The owner had already replaced the fuel pump and ignition coil trying to solve an intermittent no-start problem. The truck would crank but wouldn’t fire. After hooking up my scan tool, I found there was no communication with the PCM. No codes, no data—just silence. This is a classic sign. We tested the power and ground circuits to the module, which were all good. The final verdict was a dead PCM. We swapped in a pre-programmed module just like this one, and the truck fired up on the first try. It saved the customer hundreds in unnecessary parts and diagnostic time.
Is Your GM Truck Showing These Symptoms?
- ✔ Unexplained Check Engine Light (CEL) with codes like P0601, P0605, or P0606.
- ✔ The engine cranks but refuses to start.
- ✔ Poor or declining fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent stalling or rough idling for no apparent reason.
- ✔ Failure to pass an emissions or smog test.
The Smart, Simple Solution
Don’t let a bad computer keep your truck sidelined. This is a genuine, used OEM module that has been carefully inspected and tested. The best part? We handle the programming for you. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM-certified software specific to your truck. This makes the installation process straightforward, saving you the time and expense of having it programmed at a service center. This is the most direct way to solve complex electronic issues and restore your vehicle’s factory performance and reliability.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, often on the driver’s or passenger’s side fender well or near the battery. It’s a silver metal box with several large wiring harness connectors.
- ✔ Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. There are typically two or three bolts holding it in place.
- ✔ Install the New Module: Mount your new, pre-programmed PCM onto the bracket and tighten the bolts.
- ✔ Reconnect Everything: Firmly plug the wiring harnesses back into the correct sockets on the new module until they click into place. Reconnect your vehicle’s negative battery terminal.
- ✔ Final Step: In some cases, a security relearn procedure may be necessary, which can typically be done without special tools. Turn the key to the ‘ON’ position for 10-15 minutes, then off, and repeat two more times before starting the engine.
Verified Vehicle Compatibility
This module, identified by service number 9355699, is a direct replacement for several other part numbers including 16266645, 16250279, 16258815, and 09366810. It is confirmed to fit a wide range of GM vehicles. Please match your part number to ensure compatibility.
- Astro / Safari (GMC): 1998
- Blazer S10 / Jimmy S15: 1998
- Bravada: 1998
- Chevrolet / GMC Pickups (1500, 2500, 3500): 1998-1999
- Envoy: 1998
- Escalade: 1999
- Express / Savana Vans (1500, 2500, 3500): 1998-1999
- Isuzu Hombre: 1998
- S10 / S15 / Sonoma: 1998
- Suburban (1500, 2500): 1998-1999
- Tahoe / Yukon: 1998-1999
Frequently Asked Questions
Do I need to do anything after I install this PCM?
Because this module comes pre-programmed to your VIN, it’s designed to be a near plug-and-play installation. Some vehicles may require a simple security relearn procedure (also known as a CASE relearn), which can be done without any special tools. Instructions are readily available online for this common procedure.
Is this a new part?
No, this is a thoroughly tested, genuine OEM part sourced from a salvaged vehicle. This provides OEM reliability at a fraction of the cost of a new module from a dealer.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it. You can typically find your VIN on your driver’s side dashboard (visible through the windshield) or on the driver’s side door jamb sticker.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (like code P0601), then yes, this part will resolve the issue. However, if the light is on due to a faulty sensor or other component, you will still need to address that separate problem.
What if I order the wrong part?
It is crucial to match the service number (9355699) on your original module to this listing. We program each unit specifically for the VIN provided, so please verify compatibility before ordering to ensure a smooth repair process.