Is Your 1998 Riviera Running Rough?
If you’re dealing with frustrating issues like a persistent Check Engine Light, poor fuel economy, erratic shifting, or a no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, when the PCM starts to fail, it can cause a cascade of problems that are difficult to diagnose. In my 20+ years as a technician, I’ve seen these exact symptoms on countless late-90s GM vehicles, and a faulty PCM is a very common culprit.
The Direct-Fit, No-Hassle Solution
This isn’t just a replacement part; it’s a complete solution. We take a high-quality, tested PCM and program it specifically to your vehicle’s Vehicle Identification Number (VIN). This means it arrives at your door loaded with the latest GM software updates for your exact 1998 Riviera. You get improved performance and reliability without the expensive trip to a dealership for programming. This is the same process we use in our own shop to get customers back on the road quickly and affordably.
Expert Pro Tip From a 20-Year Veteran
Before you install your new PCM, take a moment to inspect the electrical connector harnesses. Over the decades, the plastic can become brittle and the terminal pins inside can get corroded from moisture. I’ve seen perfectly good replacement PCMs fail to communicate simply because of a poor connection. Use a small brush and some quality electrical contact cleaner to gently clean both the male and female ends of the connectors. This simple five-minute step ensures a solid connection and prevents a world of diagnostic headaches.
Common Symptoms of a Failing 1998 Riviera Powertrain Control Module:
- ✔ Unexplained Check Engine Light illumination
- ✔ Vehicle fails to start or stalls intermittently
- ✔ Noticeable decrease in fuel efficiency
- ✔ Harsh or delayed automatic transmission shifting
- ✔ Engine misfires or runs poorly
- ✔ Failure to pass emissions testing
Plug-and-Play Installation: No Dealer Visit Required
Installing your programmed PCM is a straightforward job you can do in your own garage. Just follow these simple steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these GM vehicles, the PCM is located in the engine bay, often inside the air filter box for protection.
- Disconnect Connectors: Carefully unclip the electrical wiring harnesses from the old module.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place and securely reconnect the wiring harnesses.
- Reconnect Battery: Re-attach the negative battery terminal. Your Riviera is now ready to start with its new computer.
This module is a direct replacement for service numbers 09356741, 16236757, 9356741, 9357034, 9357440, and 9366314, and fits a wide range of GM cars from that era. By providing your VIN at checkout, you guarantee a part that works correctly right out of the box.