Restore Peak Performance to Your GM Truck or SUV
Is your 1998 GMC Envoy, Chevrolet truck, or other compatible GM vehicle suffering from perplexing issues like a persistent check engine light, erratic shifting, poor fuel economy, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that governs your engine and transmission’s most critical functions. A faulty PCM can disrupt everything from fuel delivery and spark timing to transmission shift points, making your vehicle unreliable and frustrating to drive. This replacement Powertrain Control Module is the definitive solution to restore your vehicle’s factory performance and dependability.
The Brain of Your Vehicle, Programmed for You
This isn’t just a generic part off a shelf. We provide a fully programmed PCM tailored specifically to your vehicle. Upon purchase, you will provide us with your Vehicle Identification Number (VIN), and our technicians will flash the module with the latest, most stable software updates directly from General Motors. This critical step ensures that the PCM communicates flawlessly with all other modules and sensors in your vehicle, just as the original did. This process eliminates the need for an expensive trip to the dealership for programming, saving you time and money.
From the Diagnostic Bay
We once had a 1999 Chevy Silverado 1500 in the shop that was a real head-scratcher. The owner had replaced the throttle position sensor, the mass airflow sensor, and even the fuel pump chasing an intermittent stalling issue and a check engine light with a laundry list of unrelated codes. After hours of diagnostics, we traced the issue back to the PCM. The internal voltage regulation was failing, sending erratic signals to the sensors and causing them to report false data. We installed a VIN-programmed PCM, and it was like a new truck. All the codes vanished, the engine idled smoothly, and the stalling was gone. It’s a powerful reminder that sometimes the problem lies with the component that reads the sensors, not the sensors themselves.
Common Symptoms of a Failing 1998 Envoy PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
A Simple, Direct-Fit Solution
This module is a direct replacement for original equipment part numbers 09355699, 16250279, and 09366810. It is designed to fit a wide range of popular GM trucks, vans, and SUVs from the late 1990s, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Suburban, and many more. The installation process is straightforward for a DIY mechanic or any professional technician. Once programmed to your VIN, it’s a plug-and-play component. In some cases, a simple security relearn procedure (often called a VATS relearn) may be necessary, which can be done without any special tools. This procedure pairs the new PCM to your vehicle’s anti-theft system.
Frequently Asked Questions
Is this PCM ready to install right out of the box?
Almost! It will be ready for installation as soon as we program it with your vehicle’s specific VIN. After you place your order, you must provide us with your VIN so we can flash the module with the correct GM software before shipping.
What is the security relearn procedure?
For many GM vehicles of this era, it’s a simple process. After installing the PCM, you’ll turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. You repeat this cycle three times. This allows the new PCM to recognize your vehicle’s encoded key. Instructions are readily available online for your specific model.
How do I send you my VIN?
After you complete your purchase, you can reply to your order confirmation email with your 17-digit VIN. You can find the VIN on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your insurance/registration documents.
Will this fix my specific problem?
If your vehicle’s issues have been correctly diagnosed as a faulty PCM, then this part is the solution. It will resolve problems directly caused by the computer. However, it will not fix other mechanical or electrical issues, such as a bad sensor or wiring problem.
Is this compatible with my vehicle if my part number is slightly different?
This module is a direct replacement for part numbers 09355699, 16250279, and 09366810. Please check the extensive fitment list on this page and verify that your original module carries one of these numbers to ensure compatibility.