Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 GMC 2500, Chevrolet Silverado, Tahoe, or Suburban running rough, stalling, or refusing to start? Are you plagued by a persistent Check Engine Light with confusing error codes? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. A faulty PCM can wreak havoc on everything from fuel economy and transmission shifting to engine timing and emissions. This genuine OEM PCM, part number 09355699, is the reliable and cost-effective solution to get your vehicle running like new again.
Unlike other sellers, we take the guesswork and hassle out of the replacement process. Each module is meticulously programmed with the latest official GM software updates specifically for your vehicle’s 17-digit VIN. This means no expensive trips to the dealership for flashing or programming. It arrives at your door ready for a straightforward, plug-and-play installation, restoring the precise control and communication your engine and transmission need to operate correctly.
From the Diagnostic Bay
I remember a ’99 Suburban that came in with the most bizarre, intermittent stalling issue. It would run perfectly for days, then die at a stoplight without warning. The owner had already replaced the fuel pump, ignition coil, and crank sensor. We scanned it and found no hard codes, just a history of communication loss errors. After checking the wiring harness for the fifth time, we decided to monitor the PCM’s live data on a long test drive. Sure enough, we saw the 5-volt reference signal drop out randomly, just for a split second, right before it would stall. It was a classic case of an internally failing PCM. We swapped in a VIN-programmed unit just like this one, and the truck never had the problem again. Sometimes, the simplest solution is the right one.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) illumination
- ✔ Engine stalling, stumbling, or hesitating
- ✔ Rough or erratic idling
- ✔ No-start or hard-start conditions
- ✔ Poor fuel economy
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Failure to pass emissions testing
- ✔ Communication error codes with a scan tool
Installing Your 1998-1999 GMC 2500 PCM
This module is a direct replacement for a wide range of GM trucks, vans, and SUVs from the 1998-1999 model years. It is a tested, used component sourced from a salvaged vehicle, ensuring OEM quality and fitment. It directly replaces part numbers 09355699, 16266645, 16250279, 16258815, and 09366810. The installation process is typically simple, involving disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it from its bracket in the engine bay, and reversing the process with the new unit. In some cases, a simple security relearn procedure (often called a key-cycle relearn) may be required to allow the vehicle to start. This procedure can be done without any special tools. For optimal performance, a Crankshaft Variation Relearn (CASE relearn) with a capable scan tool is also recommended but not always required for the vehicle to run.
Don’t let a faulty computer keep your reliable GM truck off the road. By ordering this pre-programmed 1998-1999 GMC 2500 PCM, you are choosing a proven, efficient, and affordable path to restoring your vehicle’s health and driveability. Simply provide your VIN at checkout, and we’ll handle the rest.
Frequently Asked Questions
Do I need to have this computer programmed by a dealer?
No. We program the module for you using your vehicle’s VIN before we ship it. It will arrive ready to install, saving you time and the high cost of dealership programming.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM part that has been sourced from a salvaged vehicle. This ensures a perfect fit and original factory performance.
What information do I need to provide?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). This is critical for us to program the module correctly for your specific vehicle configuration.
Will I need to perform any other procedures after installation?
In many cases, the vehicle will start and run correctly after installation. However, you may need to perform a simple security relearn procedure, which involves cycling the key. For best results, a Crankshaft Variation Relearn (CASE relearn) using a compatible scan tool is recommended to prevent a P1336 trouble code, but it is not always necessary for the vehicle to operate.
How can I be sure this fits my vehicle?
This module fits a wide range of 1998-1999 GM vehicles. The best way to confirm is to match the part number 09355699 (or one of the alternate numbers listed) on your original computer. Our detailed fitment list also provides a comprehensive guide.