Is Your GM Truck or Van Running Rough?
If your 1998-1999 Chevrolet or GMC vehicle is experiencing frustrating issues like a persistent check engine light, erratic shifting, stalling, or a no-start condition, a failing Powertrain Control Module (PCM) is a likely culprit. As the central computer, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it fails, it can cause a cascade of problems that are often difficult to diagnose, leading to wasted time and money on incorrect repairs.
From the Diagnostic Bay
I once had a 1999 Suburban in the shop with what the owner was convinced was a bad transmission. It was shifting hard and erratically, sometimes holding gears for way too long. He had already spent a small fortune on fluid changes and sensor replacements at another shop. After hooking up our scanner, we noticed communication errors with the control module. It turned out the transmission was fine; the original PCM was failing and sending incorrect signals. A replacement, correctly programmed 1998-1999 GM PCM like this one solved the problem instantly, saving the customer from an unnecessary and costly transmission rebuild.
The Direct Solution for Your Vehicle’s Brain
This is a genuine, used OEM Powertrain Control Module, part number 09355699, sourced from a salvaged vehicle. We take the guesswork out of the replacement process. Before we ship the module, our technicians will program it specifically for your vehicle using the VIN you provide. This critical step ensures that the computer has the correct software and calibrations for your truck’s specific engine, transmission, and options, making the installation process as seamless as possible.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various trouble codes
- ✔ Engine stalling or misfiring unpredictably
- ✔ Vehicle refuses to start, even with a good battery and starter
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Noticeable decrease in fuel economy
- ✔ Failure to pass emissions testing
- ✔ Intermittent loss of power or hesitation during acceleration
Guaranteed Compatibility with VIN-Specific Programming
This module is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810. It fits a wide array of popular 1998-1999 GM vehicles, including the Chevrolet Express, GMC Savana, Chevy/GMC Pickups (1500, 2500, 3500), Tahoe, Yukon, Suburban, and many more. By providing your VIN, you guarantee that the 1998-1999 GM PCM you receive is flashed with the latest GM updates and is perfectly matched to your vehicle’s factory specifications. This eliminates compatibility issues and ensures proper function of all vehicle systems controlled by the module.
Installation is straightforward for a knowledgeable DIYer or any professional technician. After installation, you may need to perform a security relearn procedure (such as Passlock or CASE relearn) to sync the new module with your vehicle’s anti-theft system. This is a standard procedure for this generation of GM vehicles.
Do I need to get this PCM programmed?
No. We handle the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct factory software for your specific vehicle.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM part recovered from a salvaged vehicle. Each unit is inspected to ensure it meets our quality standards.
What information do you need from me?
All we need is your vehicle’s VIN (Vehicle Identification Number). This allows us to load the precise software and calibrations your vehicle requires for optimal performance.
Will any other steps be required after installation?
In many cases, you will need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This procedure is well-documented and can often be done without special tools. A Crankshaft Variation (CASE) relearn may also be necessary to prevent a P1336 trouble code.
How can I be sure this fits my truck?
This 1998-1999 GM PCM fits a wide range of vehicles listed in the fitment chart. The most important step is to match part number 09355699 or one of its alternates. Providing your VIN for programming is the final step to ensure 100% compatibility.