End the Guesswork and Get Your GM Running Right
Is your Buick Riviera, LeSabre, or Grand Prix suffering from baffling electrical issues, a persistent check engine light, or poor performance? A failing Powertrain Control Module (PCM) is often the culprit, acting as the brain of your vehicle and controlling everything from fuel mixture to transmission shifting. When it falters, it can cause a cascade of problems that are frustrating to diagnose and costly to fix. This is the definitive solution to get your vehicle back on the road, running smoothly and reliably, just like it was designed to.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty computer is the likely cause. This pre-programmed PCM is designed to be the direct solution for these issues:
- Erratic or harsh automatic transmission shifting
- Unexplained stalling or difficulty starting
- Poor fuel economy and engine performance
- Check Engine Light (CEL) with communication-related Diagnostic Trouble Codes (DTCs)
- Instrument cluster warning lights illuminating intermittently
- Vehicle failing to pass an emissions test
Instead of gambling on a used part from a salvage yard or paying steep dealership fees for programming, our process is simple. We provide a quality-tested module, flash it with the latest official GM software for your specific Vehicle Identification Number (VIN), and ship it directly to you. This is the most efficient way to install a replacement programmed 1998 Riviera PCM and restore your car’s proper function.
Features & Benefits
- โ VIN-Programmed for Your Vehicle: We flash the unit with your car’s exact VIN, ensuring it communicates perfectly with your existing systems right out of the box.
- โ Plug-and-Play Installation: Because it’s pre-programmed, there’s no need for a trip to the dealer. This can be installed in your driveway or by your trusted mechanic, saving you time and money.
- โ Updated GM Software: Your module arrives with the newest software updates from General Motors, which can resolve factory bugs and improve performance and efficiency.
- โ Direct OEM Fit: Guaranteed to fit and function correctly, this module is a direct replacement for service numbers 09356741, 16236757, 9357034, 9357440, and 9366314.
- โ Restored Drivability: Enjoy smooth shifting, reliable starts, and the original performance and fuel efficiency of your vehicle.
- โ Peace of Mind: This unit is backed by our one-year replacement warranty.
An Expert’s Pro-Tip
Before installing your new programmed 1998 Riviera PCM, take 15 minutes to perform a crucial check. A leading cause of premature PCM failure is a poor ground connection or a failing alternator. Use a multimeter to verify your battery has a full charge (12.6V engine off) and that your alternator is charging correctly (13.7V – 14.7V engine running). Clean the main engine and chassis ground connections until they are bright and shiny. This simple step ensures your new module has a stable electrical environment and can prevent future issues, protecting your investment.
Frequently Asked Questions
What is the process after I place my order?
It’s simple. After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN. We cannot ship the module until we have this information. Once we receive your VIN, our technicians will program the unit with the latest GM software specific to your car and ship it out to you.
Do I need to do anything after installation?
In most cases, this is a plug-and-play installation. However, some vehicles may require a security relearn procedure (often called a CASE relearn or Passlock relearn) to sync the new PCM with the vehicle’s anti-theft system. This procedure can typically be done without special tools and instructions are widely available online for your specific model.
Where can I find my VIN?
Your 17-digit 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 compatible with my 1998 Grand Am or LeSabre?
Yes. While this listing is focused on the Riviera, this module is compatible with a wide range of 1998-1999 GM vehicles that use the listed service numbers. Please check the detailed fitment list on this page to confirm compatibility with your specific make, model, and engine.
What if my original part number isn’t on your list?
If your original service number is not listed, please contact us with your VIN before ordering. GM often supersedes part numbers, and we can verify if this programmed 1998 Riviera PCM is the correct, updated replacement for your specific vehicle.