Restore Your Truck’s Brain and Get Back on the Road
Is your 1998-1999 GMC Yukon, Tahoe, or Suburban running rough, stalling unexpectedly, or refusing to start? These are classic signs that the Powertrain Control Module (PCM) — the central computer of your vehicle — is failing. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty PCM can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just a part; it’s the solution to restoring your truck’s reliability and performance.
We offer a dependable, tested, and used OEM PCM that is a direct replacement for part number 9366810 and other interchangeable numbers. The real value here is our professional programming service. Before we ship it, we flash the module with the latest GM factory software calibrated specifically to your vehicle’s VIN. This critical step ensures seamless communication between your engine, transmission, and other systems, saving you a costly and time-consuming trip to the dealership. This is the same process we’d use in a professional shop to guarantee a correct and lasting repair.
A Technician’s Notebook: The Ghost in the Machine
I remember a ’99 Suburban that came into my bay with a complaint of intermittent stalling and a check engine light that would come and go. The owner had already replaced the fuel pump and a couple of sensors with no luck. The scanner showed a mix of seemingly unrelated codes. This is a tell-tale sign. Instead of continuing to chase ghosts, we focused on the PCM. After swapping in a correctly programmed module, the truck ran perfectly. The internal logic of the original PCM had degraded, sending faulty commands. A replacement 1998-1999 Yukon PCM with fresh programming was the definitive fix, saving the customer from more wasted time and money.
Is Your GM Truck or Van Showing These Signs?
A failing engine computer can manifest in many ways. If you’re experiencing any of the following, a faulty PCM is a very likely culprit:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but won’t start.
- ✔ Stalling for no apparent reason, either at idle or while driving.
- ✔ Noticeably poor fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions/smog test.
- ✔ The “Service Engine Soon” or security light stays illuminated.
A Straightforward Guide to Installation
Installing your pre-programmed PCM is a job most DIYers can handle in under an hour. While the exact location can vary slightly by model, it’s typically found in the engine compartment. After installation, you will need to perform a simple security relearn procedure so the vehicle recognizes the new module. No special scan tools are required for this.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most trucks and SUVs like the Yukon/Tahoe, it’s a black box with multiple large connectors, mounted on the driver’s side of the engine compartment near the fender or firewall. On vans like the Express/Savana, it may be in the rear of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new PCM into place and securely reconnect all electrical harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (Crucial Step): Turn the key to the “ON” position (without starting the engine). The security light may be on or flashing. Leave the key on for 10-12 minutes, or until the security light turns off. Turn the key to “OFF” for 10 seconds. Repeat this cycle two more times (for a total of three cycles and about 30 minutes). The vehicle will then learn the new PCM, and you should be able to start the engine.
Verified Vehicle Compatibility
This module is a guaranteed fit for a wide range of GM trucks and vans, provided your vehicle uses one of the compatible part numbers. It is a direct replacement for modules with service ID numbers 09355699, 16266645, 16250279, 16258815, or 9366810. Please verify the number on your current module to ensure a perfect match. This part fits many popular models, including:
- ✔ 1998-1999 GMC Yukon / Yukon XL
- ✔ 1998-1999 Chevrolet Tahoe / Suburban
- ✔ 1998-1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans (Gasoline)
- ✔ 1998 Chevrolet Astro / GMC Safari
- ✔ 1998 Chevrolet S10 / GMC Sonoma (4.3L)
- ✔ 1998 Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada (4.3L)
- ✔ 1998 Isuzu Hombre (4.3L)
This quality used 1998-1999 Yukon PCM is your most effective and economical path to resolving complex electronic issues and getting your dependable GM vehicle back in top form.
Frequently Asked Questions
What exactly is a PCM?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission function, such as fuel mixture, ignition timing, and shift points, to ensure optimal performance and efficiency.
How do I provide my VIN for programming?
It’s simple. After you complete your purchase, we will contact you to request your vehicle’s 17-digit VIN. We cannot ship the module until we have this information to program it correctly for your specific vehicle.
Will I need to do anything after installing this part?
Yes. After installing the PCM, you must perform a standard GM Security Relearn Procedure. This process takes about 30 minutes and does not require any special tools. We’ve outlined the steps in the installation guide above.
Is this a new part?
No, this is a thoroughly tested, genuine OEM part sourced from a salvaged vehicle. This provides OEM reliability and function at a fraction of the cost of a new unit from a dealer.
My old part number is 09355699. Will this work?
Yes. This PCM, part number 9366810, is fully interchangeable with several other part numbers, including 09355699, 16266645, 9355699, 16250279, and 16258815. As long as your original module has one of these numbers, this part is a direct fit.
Why is a programmed module better than a blank one?
A blank module requires special, expensive equipment and a software subscription to program it. Our service handles this for you. Your module arrives ready for installation and the security relearn, saving you the hassle and expense of a dealership visit.