Is Your 1998 Buick Century Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module, or PCM, is the central computer of your 1998 Buick Century. It’s the brain behind the operation, managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When this critical component begins to fail, it can cause a cascade of confusing and frustrating problems that can be difficult to diagnose. You might experience a sudden drop in fuel economy, erratic shifting, stalling, or a persistent Check Engine Light that won’t go away. Don’t let a faulty computer keep your reliable GM vehicle off the road. This direct-fit PCM is the definitive solution to restore your car’s performance, drivability, and reliability.
From the Diagnostic Bay
I remember a 1998 Regal with the 3.8L V6 that came in with a complaint of harsh, delayed transmission shifts and a P0753 (Shift Solenoid A Electrical) code. The owner had already replaced the shift solenoid pack in the 4T65-E transmission, but the problem persisted. We checked the wiring harness from the transmission to the PCM and found no issues. On a hunch, we connected a scope to the solenoid control wire at the PCM connector. We commanded the solenoid on and off with our scan tool and saw the command signal was weak and erratic. The PCM’s internal driver for that circuit had failed. We installed a correctly programmed replacement PCM, and the transmission shifted perfectly. It’s a classic case where the problem seems to be in one place (the transmission) but is actually caused by the computer that controls it. A failing 1998 Century PCM can manifest in very misleading ways.
Common Symptoms of a Failing Powertrain Control Module
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ A complete no-start condition where the engine cranks but won’t fire.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Intermittent issues that seem to disappear and then return.
Why Choose Our Programmed 1998 Century PCM?
This isn’t just a part in a box; it’s a complete, ready-to-install solution. The biggest hurdle when replacing a modern vehicle’s computer is the need for expensive, dealer-level programming. We eliminate that step for you. When you purchase this module, we will ask for your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then use that VIN to flash the unit with the latest, most up-to-date software calibration directly from General Motors. This ensures that the PCM is a perfect match for your vehicle’s specific configuration, including its engine, transmission, and emissions equipment. This process guarantees a seamless installation and restores your vehicle to its original operating specifications.
This module is a direct replacement for multiple service numbers, including 09356741, 16236757, 9357034, 9357440, and 9366314. It is meticulously inspected and prepared to provide years of reliable service.
Extensive GM Vehicle Compatibility
While this is a perfect fit for the 1998 Buick Century, this versatile PCM was used across a wide range of popular GM vehicles from 1998 and 1999. Please verify your part number or consult the list below to ensure compatibility:
- Alero (1999): 3.4L Engine
- Achieva (1998): 3.1L Engine
- Bonneville (1998)
- Camaro (1998): 3.8L Engine
- Century (1998): 3.1L Engine
- Cutlass (1998-1999)
- Eighty Eight (1998)
- Firebird (1998): 3.8L Engine
- Grand Am (1998-1999): 3.1L & 3.4L Engines
- Grand Prix (1998)
- Intrigue (1998)
- LeSabre (1998): 3.8L Engine
- Lumina Car (1998)
- Malibu (1998): 3.1L Engine
- Monte Carlo (1998)
- Park Avenue (1998): 3.8L Engine
- Regal (1998)
- Riviera (1998): 3.8L Engine
- Silhouette (1998)
- Skylark (1998): 3.1L Engine
- Trans Sport (1998)
- Venture (1998): 3.4L Engine
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
No. We program the module to your specific VIN before it ships. It will arrive ready for installation. In some cases, a security relearn procedure may be necessary, which is a simple process that can be done without any special tools.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your part until we receive this information.
Where is the PCM located on my 1998 Buick Century?
On most vehicles compatible with this part, including the Buick Century, the PCM is located inside the vehicle’s air filter box in the engine compartment. This protects it from the elements while allowing for easy access. Always disconnect the battery before attempting to remove or install the module.
Is this a new or used part?
This is a high-quality, tested, and verified used component. Each unit undergoes a rigorous inspection and functional check to ensure it meets or exceeds original equipment standards before being programmed and shipped.
Will this fix my transmission shifting problems?
If the root cause of your shifting issue is electronic and originates from a faulty command from the PCM, then yes, this part is very likely to solve the problem. The PCM directly controls the transmission shift solenoids. However, it will not fix internal mechanical or hydraulic failures within the transmission itself.