Restore Peak Performance to Your GM Vehicle
Is your 1998 Buick Century or other GM vehicle running rough, shifting erratically, or refusing to start? A failing Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the culprit behind these frustrating and hard-to-diagnose issues. Instead of facing a costly trip to the dealership for diagnostics and programming, you can get a reliable, direct-fit solution. This module, part number 9356741, arrives at your door pre-programmed with the latest GM software updates, specifically matched to your vehicle’s VIN. It’s the straightforward fix you need to restore your car’s drivability and efficiency.
Case Study: A Tricky Diagnosis
I remember a 1998 Buick LeSabre that came into my shop with what the owner was certain was a failing transmission. It was shifting hard between first and second gear and occasionally seemed to get ‘stuck’ in gear. He had already spent a few hundred dollars on a transmission fluid service elsewhere with no improvement. After hooking up my scan tool, I saw no specific transmission fault codes, but I did notice intermittent communication loss with the PCM (a U-code). On these older GM platforms, a failing PCM can absolutely cause erratic shifting by sending incorrect signals to the transmission solenoids. We installed a VIN-programmed PCM, performed the crankshaft position sensor relearn, and the car shifted like it just rolled off the factory floor. It’s a classic example of how the PCM can be the hidden cause of what seems like a major mechanical failure.
Is Your GM Exhibiting These Telltale Signs?
A faulty PCM can create a wide range of symptoms that can be easily mistaken for other problems. If you’re experiencing any of the following, a failing engine computer could be the root cause:
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, or P0606.
- ✔ The engine cranks but refuses to start.
- ✔ Rough or unstable idling.
- ✔ A noticeable drop in fuel economy.
- ✔ Harsh or unpredictable automatic transmission shifting.
- ✔ Failure to pass an emissions or smog test.
- ✔ Intermittent stalling for no apparent reason.
A Straightforward Guide to Installation
Replacing your PCM is a manageable job for a DIY enthusiast. While specific locations vary by model, the general process is consistent. Always consult a repair manual for your specific vehicle.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On many of these vehicles, the PCM is found in the engine compartment, often inside the air filter housing or mounted to the firewall. On others, it may be under the dashboard.
- Disconnect the Harnesses: Carefully unclip the wiring harness connectors from the old module. These clips can be brittle, so work slowly.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security/Crank Relearn: For many GM vehicles of this era, a security relearn procedure (often called Passlock or Passkey) and a Crankshaft Position Sensor relearn is required. This can typically be done without special tools, and procedures are widely available online or in service manuals. This step is critical for the vehicle to start and run correctly.
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 models and configurations:
ALERO 1999 (3.4L, ID 16236757, 9356741, 9357440)
BONNEVILLE 1998
CAMARO 1998 (6-231, 3.8L)
CENTURY 1998 (6-191, 3.1L)
CUTLASS 1998-1999
EIGHTY EIGHT 1998
FIREBIRD 1998 (6-231, 3.8L)
GRAND AM 1998 (6-191, 3.1L) | 1999 (3.4L, ID 16236757, 9356741, 9366314, 9357034, 9347440)
GRAND PRIX 1998
INTRIGUE 1998
LESABRE 1998 (6-231, 3.8L)
LUMINA CAR 1998
MALIBU 1998 (6-191, 3.1L)
MONTE CARLO 1998
PARK AVENUE 1998 (6-231, 3.8L)
REGAL 1998
RIVIERA 1998 (6-231, 3.8L)
SILHOUETTE 1998
SKYLARK 1998 (6-191, 3.1L)
TRANS SPORT 1998
VENTURE 1998 (6-207, 3.4L)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact, correct GM-certified software for your car’s specific engine, transmission, and options. This ensures perfect compatibility and performance, just like the original part.
Is this part difficult to install?
The physical replacement is straightforward for most DIYers with basic tools. The most important part is performing the security and crankshaft position sensor relearn procedures after installation, which are necessary for the vehicle to start and run correctly.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (common codes include P0601-P0606), then this part is the correct fix. It’s crucial to properly diagnose the issue first, as other faulty sensors can also trigger a check engine light.
Does this part have a warranty?
Yes, all of our electronic modules come with a warranty that covers any defects in the part itself. Please see our warranty section for complete details and terms.
What does ‘flashed’ or ‘programmed’ mean?
‘Flashed’ or ‘programmed’ means we have installed the vehicle-specific operational software onto the module before shipping it. This saves you from needing expensive, specialized scan tools or a trip to the dealership for programming. It’s ready to be installed upon arrival.