Restore Your Engine’s Brain and Get Back on the Road
If your 1998 Buick Century is suffering from baffling issues like stalling, erratic shifting, or a persistent Check Engine Light, the problem often lies with a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, its health is critical. This isn’t just a replacement part; it’s a direct solution, professionally programmed with the latest GM software updates specifically for your vehicle’s VIN. This ensures your car runs exactly as the factory intended, restoring lost performance and reliability without a costly trip to the dealership for programming.
A Technician’s Notebook
I remember a 1998 Pontiac Grand Prix that came into the shop with a ghost of a problem. It would randomly stall at red lights, but never threw a consistent code. The owner had already replaced the fuel pump and ignition coils. We checked grounds, wiring, and sensor data for hours. Finally, on a hunch, we monitored the PCM’s internal processor activity and saw intermittent dropouts. A failing PCM was slowly losing its mind. We installed a VIN-programmed module just like this one, and the car ran perfectly. These older GM PCMs can fail internally in ways that are incredibly difficult to diagnose, making a reliable, pre-programmed replacement the smartest fix.
Is Your GM Vehicle Showing These Symptoms?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer is the culprit.
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Rough or unstable idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ The transmission shifts harshly, late, or not at all.
- ✔ Intermittent stalling or hesitation during acceleration.
A Straightforward Guide to Installation
Replacing your 1998 Century Powertrain Control Module is a manageable job for a DIYer with basic tools. Our pre-programmed unit makes it even simpler.
- 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 models, the PCM is located in the engine bay, often inside the air filter housing for protection. Consult a repair manual for your specific vehicle if you’re unsure.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. They have locking tabs that may need to be pressed or pulled to release. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Secure the new module in place and firmly reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Reattach the negative battery terminal. The vehicle may need to complete a security relearn procedure, which typically involves turning the key to the ‘On’ position for 10-15 minutes.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your model and engine size. This part is compatible with service numbers 09356741, 16236757, 9356741, 9357034, 9357440, and 9366314.
Chevrolet: Camaro (98), Lumina Car (98), Malibu (98), Monte Carlo (98), Venture (98)
Oldsmobile: Achieva (98), Alero (99), Cutlass (98-99), Eighty Eight (98), Intrigue (98), Silhouette (98)
Pontiac: Bonneville (98), Firebird (98), Grand Am (98-99), Grand Prix (98), Trans Sport (98)
Note: For 1999 Alero and Grand Am models, please match the ID number on your original module to ensure compatibility.
Do I need to do any programming myself?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. After you purchase, you simply provide us with your vehicle’s 17-digit VIN, and we will flash the module with the latest GM software for your specific car. It arrives ready to install.
Where do I find my VIN?
Your Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
Is this a guaranteed fix for my car’s problems?
This module will fix any issues directly caused by a faulty PCM. While the symptoms listed are common for PCM failure, it’s always best practice to have a proper diagnosis performed to rule out other potential causes like bad sensors or wiring issues.
Will this 1998 Century Powertrain Control Module fix my emission test failure?
If the failure is due to PCM-related trouble codes or improper engine management, then yes, this part will resolve the issue. Once installed, you will need to complete a drive cycle to make the emissions monitors ‘Ready’ for testing.