Restore Peak Performance to Your GM Vehicle
Is your trusty Buick, Pontiac, or Oldsmobile suddenly running poorly? If you’re dealing with a persistent Check Engine Light, unpredictable stalling, rough idling, or harsh transmission shifts, the root cause is often a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, its health is critical for performance, fuel economy, and reliability. Over two decades of heat cycles, vibrations, and electrical stress can cause internal components to fail, leading to frustrating and difficult-to-diagnose issues. This isn’t just an inconvenience; it can affect your vehicle’s safety and ability to pass emissions tests.
This replacement PCM is the definitive solution. We take the guesswork and high cost out of the repair by programming the module specifically for your vehicle using your VIN. This ensures it has the latest GM software updates, which often correct factory drivability issues you might not even know you have. By installing our 1998 Century Powertrain Control Module, you’re not just replacing a part; you’re restoring the precise, factory-intended operation of your vehicle’s powertrain.
Case Study: A Tricky Diagnosis
I remember a 1998 Pontiac Grand Am with the 3.1L V6 that came into my shop. The owner was frustrated with intermittent stalling at stoplights and a check engine light that would come and go. We checked for vacuum leaks, tested fuel pressure, and scanned for codes—nothing was consistent. On a hunch, I tapped the PCM under the dash while the engine was running, and the car immediately stumbled. This pointed to an internal failure, likely a cracked solder joint on the main board. We installed a VIN-programmed PCM, and the car ran perfectly. It’s a classic example of how a failing computer can mimic a dozen other mechanical problems.
Common Signs of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are stored, especially P0601, P0602, P0605, or U-series communication codes.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions inspections.
A Straightforward Guide to Installation
Installing your new 1998 Century Powertrain Control Module is a manageable job for a DIY enthusiast. Since it arrives programmed, no special tools are needed for software flashing.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system to discharge.
- Locate the PCM: On most of these GM models, the PCM is located inside the vehicle, on the passenger side under the dashboard, or within the center console area. Some vans (Silhouette, Venture, Trans Sport) may have it in the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket and remove it.
- Install the New Module: Seat the new PCM into the mounting bracket and secure it with the bolts. Reconnect the electrical harnesses, ensuring they click securely into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure to recognize the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your owner’s manual for the specific procedure for your model.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please confirm your model and engine options below. This part is compatible with service numbers 09356741, 16236757, 9357034, 9357440, and 9366314.
ALERO 99 Electronic Control Module; (LH center dash), 3.4L, ID 16236757, 9356741, 9357034, 9357440
BONNEVILLE 98 Electronic Control Module
CAMARO 98 Electronic Control Module; 6-231 (3.8L)
CENTURY 98 Electronic Control Module; (6-191, 3.1L)
CUTLASS 98 Electronic Control Module
CUTLASS 99 Electronic Control Module; (LH center dash), ID 16236757
EIGHTY EIGHT 98 Electronic Control Module
FIREBIRD 98 Electronic Control Module; 6-231 (3.8L)
GRAND AM 98 Electronic Control Module; 6-191 (3.1L)
GRAND AM 99 Electronic Control Module; (LH center dash), 3.4L, ID 16236757, 9356741, 9366314, 9357034, 9347440
GRAND PRIX 98 Electronic Control Module
INTRIGUE 98 Electronic Control Module
LESABRE 98 Electronic Control Module; (6-231, 3.8L)
LUMINA CAR 98 Electronic Control Module; (LH engine compartment)
MALIBU 98 Electronic Control Module; 6-191 (3.1L)
MONTE CARLO 98 Electronic Control Module
PARK AVENUE 98 Electronic Control Module; (6-231, 3.8L)
REGAL 98 Electronic Control Module
RIVIERA 98 Electronic Control Module; (6-231, 3.8L)
SILHOUETTE 98 Electronic Control Module; (LH engine compartment)
SKYLARK 98 Electronic Control Module; 6-191 (3.1L)
TRANS SPORT 98 Electronic Control Module; (LH engine compartment)
VENTURE 98 Electronic Control Module; (6-207, 3.4L)
By purchasing this 1998 Century Powertrain Control Module, you are getting a reliable, pre-programmed part that is ready for installation right out of the box. Simply provide your VIN after purchase, and we’ll handle the rest, getting you back on the road with confidence.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations for your car’s specific options, engine, and transmission. This ensures perfect compatibility and function, eliminating the need for a trip to the dealer.
Is this part difficult to install?
For most DIY mechanics with basic tools, this is a straightforward installation. The most important part is the security relearn procedure after installation, which requires no special equipment. Our instructions above provide a general guide.
Will this fix my ‘Check Engine’ light?
If the Check Engine Light is caused by an internal PCM failure (like codes P0601-P0605), then yes, this part will resolve the issue. However, you should always ensure other potential causes have been ruled out through proper diagnostics.
What is a security relearn?
The security relearn, or Passlock/VATS relearn, is a simple procedure that syncs the new PCM with your vehicle’s anti-theft system. It typically involves a sequence of turning the ignition key on and off for set periods. Without it, the vehicle may not start.
Do I need to do anything after I buy?
Yes. After you complete your purchase, you must send us your vehicle’s 17-digit VIN. We cannot program and ship your module without it.