Get Your GM Truck Back on the Road, Fast.
Is your 1998 GMC Envoy or late 90s GM truck suffering from frustrating, hard-to-diagnose issues? A failing Powertrain Control Module (PCM) can cause a host of problems, from a no-start condition to erratic shifting and a persistent Check Engine Light. This isn’t just an inconvenience; it’s a roadblock to getting your work done. We offer a direct, reliable solution: a genuine used OEM engine computer, professionally programmed to your vehicle’s specific VIN, ready to restore your truck’s performance and dependability.
Common Symptoms & Your Solution
If your vehicle is experiencing any of the following, a faulty PCM is a likely culprit. This programmed module is the definitive solution for issues such as:
- Complete no-start or intermittent starting problems
- Harsh or incorrect automatic transmission shifting
- Poor fuel economy and engine performance
- Stalling or rough idling
- Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs)
- Seemingly random electrical issues affecting gauges or accessories
Don’t let a bad computer sideline your trusted vehicle. This replacement 1998 GMC Envoy PCM is your plug-and-play fix, pre-loaded with the latest GM software updates to ensure optimal performance right out of the box.
Features & Benefits
- ✔ VIN-Programmed for You: We flash the module with your vehicle’s specific VIN, ensuring it communicates perfectly with your truck’s systems. No expensive dealer trip required.
- ✔ Latest GM Updates: Your computer arrives with the most current factory software, addressing common drivability issues and optimizing performance.
- ✔ Cost-Effective OEM Part: Get the reliability of a genuine factory part without the high cost of a new unit. This is a tested, functional computer from a salvaged vehicle.
- ✔ Broad Compatibility: A direct replacement for multiple part numbers, including 09355699, 16266645, and more, fitting a wide range of GM trucks, vans, and SUVs.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty.
Expert Mechanic’s Tip:
After installing your new PCM, it’s critical to perform a Security Relearn procedure, which is a simple process you can do yourself. For optimal performance, a Crankshaft Variation Relearn (also known as a CASE relearn) is also recommended. This requires a capable scan tool but ensures the PCM has the most accurate data from your crankshaft position sensor, preventing potential misfire codes. Also, take a moment to clean your main engine and chassis ground connections—poor grounds are a leading cause of PCM failure.
This computer is the brain of your vehicle, controlling everything from fuel delivery to transmission shifting. By choosing our pre-programmed 1998 GMC Envoy PCM, you’re not just buying a part; you’re buying a reliable solution that gets your vehicle running right and keeps it that way. Provide your VIN after purchase, and we’ll handle the rest, shipping you a module that’s ready for installation.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before we ship the module. You simply need to provide us with your vehicle’s 17-digit VIN after you place your order. The computer will arrive ready to install.
What is a Security Relearn and is it difficult?
The Security Relearn (or Passlock relearn) syncs the new PCM with your vehicle’s anti-theft system. It’s a simple procedure that typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Specific instructions are widely available online for your model, and it requires no special tools.
Is a CASE Relearn required for the vehicle to run?
In most cases, the vehicle will start and run without a CASE (Crankshaft Variation) relearn. However, you may have a Check Engine Light with code P1336 until it is performed. We highly recommend having it done with a bi-directional scan tool to ensure the engine runs as smoothly and efficiently as possible.
How do I find my VIN?
Your Vehicle Identification Number (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.
Is this a brand new part?
No, this is a fully functional, tested computer that was sourced from a salvaged vehicle. This allows us to provide a reliable OEM part at a significant savings compared to a new unit from a dealer.
Which part number will I receive?
This listing covers several interchangeable part numbers, including 16266645 and 09355699. While the part you receive may have any of these numbers on the sticker, it is guaranteed to be 100% compatible and programmed specifically for your vehicle’s VIN.