Restore Peak Performance to Your Vehicle’s Engine
Is your 1998 Buick LeSabre or other GM vehicle experiencing frustrating issues like erratic shifting, poor fuel economy, a persistent check engine light, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the computer that acts as the brain for your engine and transmission. A faulty PCM can cause a wide range of problems that can be difficult to diagnose. Instead of guessing with other parts or paying steep dealership prices, get the definitive, reliable solution right here.
This replacement PCM, part number 9357034, is the heart of your vehicle’s management system. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This means it arrives at your door with the latest GM software updates already installed, ready for a straightforward installation. This is not just a replacement part; it’s a restoration of your vehicle’s original operating efficiency and reliability.
A Technician’s Notebook: The Ghost in the Machine
I remember a 1998 Park Avenue with the 3.8L V6 that came into my bay with a complaint of intermittent stalling and a transmission that would randomly refuse to shift out of first gear. The owner had already replaced the crank sensor and a few transmission solenoids with no luck. The scan tool showed no hard codes, just a history of lost communication errors (U-codes). After checking all the main power and ground circuits to the PCM, everything looked perfect. On a hunch, I tapped on the PCM housing with the handle of a screwdriver, and the engine immediately stumbled. The problem was an internal failure in the original module, causing intermittent connection breaks on the circuit board. A new, properly programmed PCM fixed every single issue. This is a common failure mode I’ve seen on dozens of these GM vehicles.
Is Your GM Showing These Telltale PCM Failure Signs?
A failing computer can manifest in many ways. If you’re experiencing any of the following, a faulty PCM is a likely culprit:
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, P0605 (Internal Control Module Errors).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ Failure to pass an emissions/smog test.
- ✔ Other modules on the vehicle report a loss of communication with the PCM.
A Straightforward Guide to Installation
Replacing the PCM on these vehicles is a job most DIYers can handle. While the exact location varies by model, the general process is consistent. Always consult a repair manual for your specific vehicle’s location and torque specs.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On many models like the LeSabre, it’s located inside the air filter box in the engine compartment for protection and cooling. On others, it may be under the dash.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old module. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Seat your new, pre-programmed PCM into the mounting bracket and secure it.
- Reconnect Everything: Plug the wiring harnesses back into the new module until they click securely in place. Reconnect the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple security relearn procedure (often called a Passlock or Passkey relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes and can be done without special tools.
Verified Fitment for Your Vehicle
This module is a direct replacement for service numbers 09356741, 16236757, 9356741, 9357034, 9357440, and 9366314. It is confirmed to fit the following vehicles:
- 1998-1999 Oldsmobile Cutlass
- 1998-1999 Pontiac Grand Am (3.1L, 3.4L)
- 1998 Buick LeSabre (3.8L)
- 1998 Buick Park Avenue (3.8L)
- 1998 Chevrolet Venture (3.4L)
- 1999 Oldsmobile Alero (3.4L)
- 1998 Buick Riviera (3.8L)
- 1998 Buick Century (3.1L)
- 1998 Buick Skylark (3.1L)
- 1998 Pontiac Grand Prix
- 1998 Oldsmobile Achieva (3.1L)
- 1998 Oldsmobile Eighty Eight
- 1998 Oldsmobile Silhouette
- 1998 Pontiac Firebird (3.8L)
- 1998 Chevrolet Malibu (3.1L)
- 1998 Oldsmobile Intrigue
- 1998 Chevrolet Lumina Car
- 1998 Pontiac Bonneville
- 1998 Chevrolet Camaro (3.8L)
- 1998 Chevrolet Monte Carlo
- 1998 Buick Regal
- 1998 Pontiac Trans Sport
Frequently Asked Questions
What do I need to do after I purchase?
After you complete your purchase, you MUST send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship your module without it. Please double-check the VIN for accuracy before sending.
Is this part truly plug-and-play?
Yes, for the most part. Because we program it with your VIN, it eliminates the need for expensive dealer tools. However, you will need to perform a simple Security Relearn Procedure after installation so the car recognizes the new module. This procedure is detailed in many online resources and requires no special equipment.
Will this fix my car’s specific problem?
This module will correct any issues directly caused by a failing PCM. While the symptoms we’ve listed are very common for PCM failure, we always recommend a proper diagnosis by a qualified mechanic to ensure you are replacing the correct part.
What if my original part number is not 9357034?
This module is a direct replacement for several service numbers, including 09356741, 16236757, 9356741, 9357440, and 9366314. As long as your vehicle is on our compatibility list and your original module has one of these numbers, this part will work perfectly.
Do I need to send my old PCM back?
No core charge or return is required for this part. You can keep or responsibly dispose of your old module.