Restore Your GM Vehicle’s Performance and Reliability
Is your 1998 Buick Riviera or other GM vehicle suffering from frustrating issues like stalling, poor fuel mileage, a persistent check engine light, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer of your vehicle. When it falters, everything from engine timing to transmission shifting can be affected. This isn’t just an inconvenience; it’s a critical failure that can leave you stranded. I’ve spent over two decades diagnosing these exact problems, and a faulty PCM is often the culprit behind the most perplexing electronic gremlins.
This isn’t just a replacement part; it’s a direct solution. We provide a high-quality PCM, part number 16236757, that arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). This means we load the latest GM factory software onto the module before we ship it. You get a component that is ready for installation right out of the box, eliminating the need for an expensive trip to the dealership for programming. This is the most efficient way to get your car back to factory-spec operation.
A Technician’s Notebook: The Intermittent No-Start
I remember a 1998 Buick LeSabre that came into the shop on a tow truck. The owner was frustrated because it would randomly refuse to start. All the basics checked out—battery, starter, fuel pressure. The scan tool showed no communication with the PCM. After wiggling the PCM connectors, it would sometimes start and run perfectly for days, only to fail again. This intermittent loss of communication is a tell-tale sign of internal circuit board failure in the PCM. We installed a VIN-programmed module just like this one, and the car never had the issue again. It’s a fix that restores not just the car, but the owner’s peace of mind.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it might be time to replace your 1998 Riviera PCM or the corresponding module in your GM vehicle.
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or other communication errors.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions test.
- ✔ Intermittent electrical issues that seem to have no other cause.
A Straightforward Guide to Installation
Replacing the PCM is a manageable job for a DIY enthusiast. With our pre-programmed module, you skip the hardest part. Just follow these general steps to get back on the road.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On many of these GM models, the PCM is located in the engine bay, often inside the air filter box assembly or mounted to the firewall. Consult a repair manual for your specific model’s location.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed module in place and securely fasten it. Reconnect the wiring harness connectors, ensuring they click firmly into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: On many GM vehicles, you will need to perform a security relearn procedure (often called a Passlock or VATS relearn) to allow the vehicle to start. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the new PCM to sync with your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 09356741, 16236757, 9357034, 9357440, and 9366314. It is guaranteed to fit the following vehicles. Please ensure your vehicle’s specific ID matches where noted.
ALERO 99 (3.4L, ID 16236757, 9356741, 9357440)
BONNEVILLE 98
CAMARO 98 (6-231, 3.8L)
CENTURY 98 (6-191, 3.1L)
CUTLASS 98 & 99 (ID 16236757)
EIGHTY EIGHT 98
FIREBIRD 98 (6-231, 3.8L)
GRAND AM 98 (3.1L) & 99 (3.4L, ID 16236757, 9356741, 9366314, 9357034, 9347440)
GRAND PRIX 98
INTRIGUE 98
LESABRE 98 (6-231, 3.8L)
LUMINA CAR 98
MALIBU 98 (6-191, 3.1L)
MONTE CARLO 98
PARK AVENUE 98 (6-231, 3.8L)
REGAL 98
RIVIERA 98 (6-231, 3.8L)
SILHOUETTE 98
SKYLARK 98 (6-191, 3.1L)
TRANS SPORT 98
VENTURE 98 (6-207, 3.4L)
Frequently Asked Questions
Frequently Asked Questions
How does the VIN programming work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this number to access the latest official GM software for your exact vehicle configuration and flash it onto the module before shipping. This ensures perfect compatibility.
Do I need to do anything else after installation?
Besides the security relearn procedure mentioned in the installation guide, some vehicles may require a Crankshaft Position System Variation (CASE) relearn. This can be done with a capable bi-directional scan tool and ensures the PCM has the most accurate data from the crank sensor for optimal timing and misfire detection.
Is this a new or used part?
This is a quality, inspected, and tested recycled OEM part that has been verified to be fully functional. It is then programmed with fresh, vehicle-specific software, providing a reliable and cost-effective solution.
Will this fix my car’s problem for sure?
While this 1998 Riviera PCM resolves the common symptoms listed, proper vehicle diagnosis is key. We recommend confirming the PCM is the point of failure before purchasing. If you’re unsure, consulting a professional mechanic or referencing a factory service manual is a great step.
What happens if I provide the wrong VIN?
The programming is specific to the VIN. Providing an incorrect VIN will result in a module that is not compatible with your vehicle and may cause it not to start or run improperly. Please double-check your VIN from your driver’s side door jamb sticker or dashboard plate before sending it to us.