Is Your Late 90s GM Truck or Van Giving You Headaches?
If you’re dealing with frustrating and unpredictable issues like stalling, poor performance, or a persistent check engine light on your 1998-1999 Chevrolet or GMC vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, the PCM’s health is critical for smooth operation. When it begins to fail, it can create a cascade of problems that are difficult to diagnose. This replacement PCM, professionally programmed to your vehicle’s specific VIN, is the definitive solution to restore your truck’s reliability and performance.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light with communication-related trouble codes (like U-codes) or false sensor codes.
- ✔ Engine stumbles, misfires, or stalls unexpectedly, especially after warming up.
- ✔ A noticeable drop in fuel economy for no apparent reason.
- ✔ Harsh, erratic, or delayed transmission shifting.
- ✔ A frustrating no-start condition where the engine cranks but refuses to fire up.
- ✔ Intermittent failure of dashboard gauges or other electronic components.
- ✔ The vehicle fails to pass an emissions or smog test.
We had a ’99 Yukon in the shop that was driving the owner crazy. It would start fine cold, but after driving for 20 minutes, it would stall and refuse to restart for an hour. We checked fuel pressure, spark, and sensors—all tested good. After hours of chasing ghosts, we hooked up a scope to the PCM outputs and saw the injector driver circuits were dropping out as the module got hot. A replacement PCM, programmed to the VIN, solved the problem instantly. Heat-related internal failure is a classic sign of a dying PCM from this era.
The Right Solution: A VIN-Programmed 1998-1999 GM PCM
Don’t settle for a generic, off-the-shelf computer that may or may not work with your vehicle’s specific options. We take the guesswork out of the repair. This is a quality, tested, used OEM module sourced from a salvaged vehicle. The critical difference is our professional programming service. Before we ship it, we flash the unit with the latest official GM software updates, calibrated precisely to your vehicle’s Vehicle Identification Number (VIN). This ensures that the PCM recognizes all your vehicle’s systems, from the engine and transmission to the security system and optional equipment, for a true plug-and-play installation.
Our Simple 3-Step Process
- ✔ Order: Complete your purchase for this module.
- ✔ Provide VIN: Reply to your order confirmation email with your 17-digit VIN. This is crucial for correct programming.
- ✔ Install: We program and ship your ready-to-install PCM. In most cases, you simply disconnect the battery, swap the module, and reconnect the battery. Some models may require a simple security relearn procedure (key cycling), and we can provide instructions for that.
By purchasing this module, you are getting a cost-effective and reliable fix that restores your vehicle to its factory operating standards. This module is a direct replacement for part numbers 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810, and fits a wide array of GM trucks and vans. Verify your vehicle in the fitment list and get back on the road with confidence.
Frequently Asked Questions
What exactly is VIN programming?
VIN programming is the process of loading a vehicle’s specific software and calibration files onto the PCM. This data, tied to your 17-digit Vehicle Identification Number (VIN), tells the computer about your engine size, transmission type, axle ratio, and other options. This ensures all systems communicate and function correctly, just as they did from the factory.
Do I need to do anything after I install this PCM?
In most cases, the module is ready to go right out of the box. However, some GM vehicles require a security relearn procedure to sync the new PCM with your keys. This is a simple process that typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. We can provide specific instructions if needed.
Is this a new part?
No, this is a high-quality, tested, used OEM computer sourced from a salvaged vehicle. This provides the reliability of an original factory part at a significant cost saving compared to a new module from a dealer.
How do I find my vehicle’s VIN?
Your 17-digit VIN can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this PCM fix my specific problem?
This module will correct any issues directly caused by a faulty PCM. While the symptoms listed are very common for PCM failure, it’s always recommended to have a proper diagnosis performed to rule out other potential causes like bad sensors, wiring, or fuel system components.