Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 GMC 1500, Chevrolet Silverado, Tahoe, or Suburban running rough, shifting erratically, or showing a persistent check engine light? The Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the culprit. This vital component manages everything from fuel injection and ignition timing to transmission shift points. When it fails, it can cause a cascade of frustrating and hard-to-diagnose issues. This listing offers a direct, reliable solution: a quality-tested, used OEM engine computer programmed specifically for your vehicle.
The Plug-and-Play Solution You Need
Forget expensive trips to the dealership for programming and diagnostics. We take the guesswork and high cost out of the equation. When you purchase this module, simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the unit with the latest factory software from General Motors, ensuring it is a perfect match for your truck’s specific configuration, including engine size, transmission type, and emissions equipment. The result is a true plug-and-play part that restores your vehicle’s original functionality and performance.
From the Diagnostic Bay
We had a ’99 Chevy Tahoe come into the shop with a problem that was driving the owner crazy. It would randomly stall at stoplights, but only when the engine was warm. There were no consistent trouble codes, just a generic communication error that would pop up now and then. The owner had already replaced the fuel pump and ignition coil. We checked all the wiring and grounds, which were solid. On a hunch, we connected a scope to the PCM’s main processor and saw the signal drop out precisely when the engine bay reached a certain temperature. A replacement, pre-programmed PCM like this one solved the issue in under 15 minutes. It’s a classic example of how a failing computer can create phantom problems that seem unrelated.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with communication-related codes (e.g., U-codes).
- ✔ The engine cranks but refuses to start, or starts and immediately stalls.
- ✔ Noticeable decrease in fuel economy and poor engine performance.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ Misfire codes (like P0300) that persist even after replacing spark plugs, wires, and coils.
- ✔ Vehicle fails to pass state emissions testing due to readiness monitor issues.
- ✔ Intermittent electrical problems that seem to have no logical source.
Why Choose Our 1998-1999 GMC 1500 PCM?
This genuine OEM computer is sourced from a salvaged vehicle and has been thoroughly inspected. By choosing a quality used part, you get the reliability of an original factory component without the high price tag of a new unit. Our professional VIN programming service ensures that the module you receive is ready for immediate installation, saving you time, money, and the hassle of coordinating with a separate programming service or dealership. This module is a direct replacement for multiple part numbers, including 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810, and fits a wide array of GM trucks and vans from the 1998-1999 model years. Please verify your part number and consult the detailed fitment list to ensure compatibility.
Frequently Asked Questions
Do I need to program this computer?
No. This PCM comes fully programmed to your vehicle’s specific VIN before it is shipped. It is ready for installation right out of the box. You will need to perform a simple security relearn procedure after installation, which typically takes about 10-15 minutes and does not require any special tools.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found in several places: on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
Is this a new part?
No, this is a high-quality, tested, and functional used OEM part sourced from a salvaged vehicle. This ensures factory-level compatibility and reliability at a fraction of the cost of a new module.
What is the security relearn procedure?
For most GM vehicles of this era, the security relearn (VATS/Passlock) is a simple key-on procedure. After installing the new PCM, turn the key to the ‘ON’ position (without starting the engine) and leave it for 10 minutes. The ‘Security’ light should turn off or stop flashing. Turn the key off for 10 seconds, then repeat the 10-minute ‘ON’ cycle two more times for a total of three cycles. After the third cycle, the vehicle should start and run normally.
Will this fix my vehicle’s specific problem?
This module will correct any issues directly caused by a faulty PCM. While the symptoms listed above are common indicators of PCM failure, it is essential to have your vehicle properly diagnosed. This part will not fix problems related to other faulty sensors, wiring, or mechanical components.