Restore Peak Performance to Your Vehicle’s Engine
Is your 1998 Buick Riviera, or another compatible GM vehicle, suffering from erratic engine behavior, poor fuel economy, or a persistent check engine light? The Powertrain Control Module (PCM) is the central command center for your engine, managing everything from fuel injection and spark timing to transmission shifting and emissions control. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. This direct-fit replacement PCM, part number 9357440, is the definitive solution to restore your vehicle’s original performance and reliability.
Unlike a generic module from a parts store or salvage yard, this unit comes pre-programmed specifically for your vehicle. We use your Vehicle Identification Number (VIN) to flash the module with the latest, most stable software updates directly from GM. This critical step ensures seamless integration with your vehicle’s systems, eliminating the need for an expensive trip to the dealership for programming. It’s a true plug-and-play solution designed to get you back on the road with confidence.
From the Diagnostic Bay
We had a 1998 Buick LeSabre come in with a phantom misfire that the owner had been chasing for months. He’d replaced plugs, wires, the ignition control module—you name it. The misfire was intermittent, happening only after the car was fully warmed up. Scanners showed a random misfire code, but no specific cylinder. After exhausting all the usual suspects, we hooked up a lab scope to the injector control signals coming from the PCM. Sure enough, once the engine bay got hot, the signal for cylinder 3 would start to break down. The driver inside the original PCM was failing under heat. We installed one of these pre-programmed modules, and the car ran perfectly. It’s a classic case of how a failing 1998 Riviera PCM can mimic a completely different component failure.
Is Your GM Vehicle Showing Signs of a Failing PCM?
A faulty Powertrain Control Module can manifest in various ways. If you’re experiencing any of the following symptoms, a failing PCM could be the culprit:
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass emissions testing.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Intermittent issues that are difficult to replicate.
The Right Solution for Your 1998 Riviera PCM
This module is a direct replacement for a wide range of GM vehicles from the late 1990s, including the Buick Riviera, Park Avenue, LeSabre, Pontiac Grand Prix, Chevrolet Lumina, and many more. It is a reliable and cost-effective alternative to sourcing a new part from a dealer. By providing us with your VIN during checkout, you guarantee that the module you receive is perfectly matched to your vehicle’s specific configuration, including engine, transmission, and emissions equipment. The process is simple: you order, you provide your VIN, and we ship a module that’s ready for installation right out of the box.
Frequently Asked Questions
Do I need to have this module programmed?
No. This PCM comes fully programmed to your vehicle’s specific VIN before it is shipped. This makes the installation process straightforward and eliminates the need for specialized tools or a visit to a dealership.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your car. It contains critical information about the make, model, engine, transmission, and factory options. We use this information to load the exact correct software from GM for your vehicle’s build.
Where is the PCM located on a 1998 Buick Riviera?
On most compatible vehicles from this era, including the 1998 Riviera, the PCM is typically located inside the vehicle’s air filter box in the engine compartment for cooling purposes. Always disconnect the battery before attempting to remove or install the module.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s essential to properly diagnose the vehicle first, as the check engine light can be triggered by many other failing components.
Is any other procedure required after installation?
In some cases, a security relearn or a Crankshaft Position Sensor (CASE) relearn may be necessary. These are typically simple procedures that can be done without special tools. Instructions can often be found in service manuals or online forums for your specific model.