Is Your Buick Riviera Running Rough?
If you’re dealing with a frustrating no-start condition, intermittent stalling, erratic shifting, or a persistent check engine light on your 1998 Buick Riviera, a failing Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience, I’ve seen how a faulty PCM can turn a reliable car into a source of constant headaches. It’s the central computer for your engine and transmission, and when its internal circuits degrade, performance suffers dramatically.
The Direct-Fit, Programmed Solution
This isn’t just a replacement part; it’s a complete solution. We are providing a genuine OEM Powertrain Control Module that will be professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module communicates flawlessly with your Riviera’s engine, transmission, and anti-theft system (VATS/PassKey). By flashing it with the latest GM software updates, we often resolve issues that were present even in the original factory programming. This means you get a module that is truly plug-and-play, with no expensive trip to the dealership required for additional programming.
Expert Pro Tip from a 20-Year Tech: Before you condemn your old PCM, take a moment to inspect the main ground connections. On these late-90s GM vehicles, a corroded or loose ground strap between the engine block and the chassis can cause voltage drops that mimic a failing computer. I’ve seen customers replace a perfectly good module when all they needed was a wire brush and a wrench to clean and tighten a ground point. It’s a 5-minute check that could save you time and money.
Common Symptoms of a Failing 1998 Riviera PCM
If you’re experiencing any of the following, a faulty PCM is the likely cause:
- ✔ Check Engine Light is on with various communication or sensor codes
- ✔ The engine cranks but refuses to start
- ✔ Poor fuel economy for no apparent reason
- ✔ Harsh or delayed shifting from the automatic transmission
- ✔ Intermittent stalling, especially when coming to a stop
- ✔ Noticeable loss of engine power and acceleration
Simple, Straightforward Installation
Installing your pre-programmed module is a job most DIYers can handle in their own driveway. Here’s a basic guide:
- Safety First: Always disconnect the negative terminal from your car’s battery and wait a few minutes for the system to discharge.
- Locate the PCM: On the 1998 Riviera, the PCM is typically located under the dash on the passenger side. You may need to remove a lower dash panel for access.
- Disconnect the Old Module: Carefully unplug the electrical harness connectors. They have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Swap the Modules: Unbolt the old PCM from its mounting bracket and secure the new one in its place.
- Reconnect and Finalize: Plug the harness connectors firmly into your new module until they click. Reconnect your battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Guaranteed Compatibility
This module, part number 16236757, is a direct replacement for a wide range of GM vehicles from this era. It is compatible with service numbers 09356741, 16236757, 9357034, 9357440, and 9366314. After purchase, simply provide us with your VIN, and we’ll handle the rest, ensuring you receive a module that is perfectly matched to your vehicle’s specifications.