Is Your GM Vehicle Running Rough?
Are you tired of staring at a persistent check engine light? Experiencing frustrating issues like rough idling, erratic transmission shifting, or poor fuel economy in your Buick, Pontiac, or Oldsmobile? These are classic signs that your vehicle’s brain—the Powertrain Control Module (PCM)—is failing. A faulty PCM can make your car unreliable and stressful to drive. It’s time to stop guessing and install a solution that restores your vehicle’s performance and your confidence on the road.
Common Symptoms & Your Solution
A failing engine computer can cause a wide range of confusing problems. If you’re noticing any of the following, this pre-programmed module is the definitive fix you need:
- Persistent Check Engine Light (CEL)
- Engine stalling or stumbling
- Harsh or unpredictable automatic transmission shifts
- A noticeable drop in fuel mileage
- Failure to pass an emissions test
- No-start conditions where the engine cranks but won’t fire
This replacement 1998 LeSabre PCM 9357034 is the central command unit for your engine and transmission. We program it specifically to your vehicle’s VIN, ensuring it communicates perfectly with all other systems right out of the box. It’s not just a replacement part; it’s a complete, reliable restoration of your car’s critical operating system.
Features & Benefits
- ✔ Plug & Play Installation: This module arrives pre-programmed to your vehicle’s exact VIN with the latest GM software. This eliminates the need for an expensive trip to the dealership for programming.
- ✔ Restores Peak Performance: By correcting engine and transmission commands, this PCM restores the smooth acceleration, crisp shifting, and optimal fuel efficiency you expect from your vehicle.
- ✔ Direct-Fit Guaranteed: Engineered to match the original factory unit, ensuring a perfect fit and straightforward installation with no modifications required.
- ✔ Solves Annoying Electrical Gremlins: A new, properly functioning PCM resolves many of the mysterious drivability issues and false sensor codes that a failing unit can cause.
- ✔ Peace of Mind Guarantee: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
For these late-90s GM vehicles, the PCM is tied directly to the anti-theft system (VATS/Passlock). Simply swapping a module from another car will result in a no-start condition, leaving you stranded. Our process of programming the module to your specific VIN before shipping is not just a convenience—it’s essential. We ensure the security handshake between the key, the body control module, and your new 1998 LeSabre PCM 9357034 is perfect, so your car starts and runs correctly on the first try.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your car’s main computer. It controls all aspects of engine and transmission function, from fuel injection and spark timing to emission controls and automatic gear shifts, ensuring optimal performance and efficiency.
How do I know for sure that my PCM is the problem?
While the symptoms listed above are strong indicators, a definitive diagnosis often requires a professional scan tool. Common signs include communication error codes (U-codes), multiple unrelated sensor codes appearing at once, or erratic behavior that can’t be traced to a specific mechanical part.
Is this part difficult to install?
For most of the compatible vehicles, the PCM is in an accessible location (like the LH center dash or engine compartment). Installation typically involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and then reversing the process. It’s a manageable job for a confident DIYer with basic tools.
What information do you need from me after I order?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it. This ensures the 1998 LeSabre PCM 9357034 is a perfect match for your car’s specific configuration.
Will this PCM require any additional programming?
No. The unit arrives fully programmed and ready for installation. In some cases, a security relearn procedure may be required, which is a simple process that can be done without any special tools. We can provide instructions for this if needed.
Does this fit models other than the 1998 LeSabre?
Yes. This module is compatible with a wide range of 1998 and 1999 GM vehicles, including the Grand Prix, Bonneville, Park Avenue, Cutlass, and more. Please check the detailed fitment list on this page to confirm it matches your specific make, model, and engine.