Restore Your GM’s Performance and Reliability
If you’re dealing with a frustrating check engine light, erratic engine behavior, or a no-start condition in your 1998 Buick Century or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its health is critical. Over my 20 years in diagnostics, I’ve seen countless vehicles with mysterious issues—poor fuel economy, harsh shifting, or failed emissions tests—that all traced back to a faulty PCM. This isn’t just a part; it’s the brain of your vehicle, and when it falters, everything else can go haywire.
We take the guesswork and hassle out of the repair. This replacement Powertrain Control Module, part number 9357440, arrives at your door pre-programmed with the latest official GM software updates. All we need is your vehicle’s VIN at checkout. This critical step ensures the module communicates perfectly with your car’s specific systems, saving you a costly trip to the dealership for programming. It’s a direct-fit, reliable solution designed to get your car running smoothly again.
From the Diagnostic Bay: The Ghost in the Grand Prix
I once had a 1998 Grand Prix in the shop that was driving its owner crazy. It would randomly stall at stoplights, the transmission would shift hard, and the check engine light was on with a mix of communication codes (U-codes) and a dreaded P0601 (Internal Control Module Memory Check Sum Error). The owner had already replaced the throttle position sensor and the mass air flow sensor with no luck. After confirming power and ground to the PCM were solid, I knew where to look. The original module was failing internally. We installed a correctly programmed PCM, performed the security relearn, and the car ran like new. It’s a classic example of how a single component, the 1998 Century Powertrain Control Module, can cause a cascade of confusing symptoms.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light is illuminated, often with codes like P0601, P0602, P0605, or various U-series communication codes.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Failure to pass a state emissions inspection.
- ✔ Other modules (like ABS or BCM) cannot communicate with the engine computer.
A Straightforward Guide to Installation
Installing your new 1998 Century Powertrain Control Module is a manageable job for a DIY enthusiast. The most important part is the security relearn procedure after installation, which is required for the vehicle to start.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these vehicles, the PCM is located in the engine bay, often inside the air filter box housing for protection. Consult a repair manual for your specific model if you’re unsure.
- Disconnect Connectors: Carefully unplug the wiring harness connectors from the old module. They have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt the new, pre-programmed PCM into place and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (CRITICAL): This is a non-negotiable step. Attempt to start the engine; it will crank but not run. Leave the key in the ‘ON’ position for 10-12 minutes, or until the ‘Security’ or ‘Theft’ light on the dash stops flashing and turns off. Turn the key off for 10 seconds, then repeat the process two more times for a total of three 10-minute cycles. The vehicle should start on the next attempt.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 09356741, 16236757, 9356741, 9357034, 9357440, and 9366314. It is guaranteed to fit the following makes and models. Please verify your engine size or specific ID number as noted.
- Achieva: 1998 (3.1L)
- Alero: 1999 (3.4L, check ID)
- Bonneville: 1998
- Camaro: 1998 (3.8L)
- Century: 1998 (3.1L)
- Cutlass: 1998, 1999 (check ID)
- Eighty Eight: 1998
- Firebird: 1998 (3.8L)
- Grand Am: 1998 (3.1L), 1999 (3.4L, check ID)
- Grand Prix: 1998
- Intrigue: 1998
- LeSabre: 1998 (3.8L)
- Lumina Car: 1998
- Malibu: 1998 (3.1L)
- Monte Carlo: 1998
- Park Avenue: 1998 (3.8L)
- Regal: 1998
- Riviera: 1998 (3.8L)
- Silhouette: 1998
- Skylark: 1998 (3.1L)
- Trans Sport: 1998
- Venture: 1998 (3.4L)
This is the definitive solution for your vehicle. By installing this pre-programmed 1998 Century Powertrain Control Module, you are restoring the core logic that makes your car run efficiently and reliably.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before shipping. We will flash the module with the latest GM software using the VIN you provide, making it ready for installation right out of the box.
What is the ‘VIN’ and why do you need it?
The VIN is your car’s 17-digit Vehicle Identification Number. It contains specific information about your car’s engine, transmission, and options. Providing the VIN ensures we program the module with the exact software your vehicle requires for proper function.
What is the security relearn procedure?
It’s a process that syncs the new PCM with your vehicle’s anti-theft system. It’s simple to do yourself with just the ignition key and takes about 30 minutes. We include instructions, and it’s detailed in the installation guide above. Your car will not start until this is completed.
Is this a used part?
This is a high-quality, inspected, and tested recycled OEM part. Each unit is verified to be fully functional before being programmed and shipped, ensuring OEM-level reliability without the high dealership price.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also controls transmission functions, including shift points and line pressure. If your shifting issues are electronic and caused by a faulty PCM, this part will resolve them.