Restore Your Vehicle’s Core Performance
Is your 1998 Buick LeSabre, or another compatible GM vehicle, suffering from perplexing issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition? The Powertrain Control Module (PCM) is the central computer of your vehicle, orchestrating everything from fuel injection and spark timing to transmission shift points. When it fails, the symptoms can be widespread and frustrating. This replacement PCM, part number 9357440, is the definitive solution to restore your vehicle’s factory performance and reliability.
Unlike generic modules that require expensive dealership visits for programming, this unit arrives at your door fully programmed to your specific vehicle. We use your Vehicle Identification Number (VIN) to flash the module with the latest, most stable GM-approved software updates. This ensures seamless communication between all vehicle systems and a true plug-and-play installation process. Simply provide your VIN after purchase, and we handle the complex programming for you.
From the Diagnostic Bay
We had a 1998 Park Avenue come into the shop that had its owner completely stumped. The car would randomly stall at stoplights and had a rough, hunting idle. The owner had already replaced the spark plugs, wires, and even the mass airflow sensor with no improvement. Diagnostic scans showed a slew of intermittent communication codes. Instead of continuing to throw parts at it, we focused on the central hub: the PCM. After installing a VIN-programmed module just like this one, the car ran perfectly. The idle smoothed out, the stalling disappeared, and all communication codes were gone. It’s a classic case of how a failing computer can mimic a dozen other mechanical problems.
Is Your 1998 LeSabre PCM Failing?
A faulty powertrain control module can manifest in various ways, often being misdiagnosed as a bad sensor or transmission issue. If you’re experiencing any of the following, it’s a strong indicator that your PCM is the culprit. This direct replacement is engineered to resolve these exact problems, getting you back on the road with confidence.
Common Symptoms of a Bad PCM
- ✔ Check Engine Light: The light is on, and you may have codes related to module communication (U-codes) or multiple, unrelated sensor codes.
- ✔ Engine Performance Issues: Stalling, rough idling, misfiring, hesitation during acceleration, or a noticeable drop in fuel efficiency.
- ✔ Transmission Problems: Harsh or delayed shifting, getting stuck in one gear (limp mode), or incorrect gear selection.
- ✔ Starting Problems: The engine cranks but won’t start, or it starts and immediately stalls.
- ✔ Failed Emissions Test: Inability to pass smog or emissions testing due to module-related faults.
- ✔ No Communication: A scan tool cannot communicate with the PCM, indicating a total failure.
Broad GM Compatibility
This module is not just for the LeSabre. It is a direct replacement for a wide range of 1998 and 1999 GM vehicles equipped with the 3.1L, 3.4L, and 3.8L engines. It is compatible with service numbers 09356741, 16236757, 9357034, 9357440, and 9366314. Please verify your vehicle in the fitment list below:
- Buick: Century (98), LeSabre (98), Park Avenue (98), Regal (98), Riviera (98), Skylark (98)
- Chevrolet: Camaro (98), Lumina (98), Malibu (98), Monte Carlo (98), Venture (98)
- Oldsmobile: Achieva (98), Alero (99), Cutlass (98-99), Eighty Eight (98), Intrigue (98), Silhouette (98)
- Pontiac: Bonneville (98), Firebird (98), Grand Am (98-99), Grand Prix (98), Trans Sport (98)
Frequently Asked Questions
What do I need to do after I purchase?
After you place your order, you must send us your vehicle’s 17-digit VIN. We cannot ship your part until we have this information, as we use it to program the module specifically for your car.
Is any additional programming required once I install it?
No. This PCM comes fully programmed and ready for installation. In most cases, you will not need to perform any additional procedures. However, some vehicles may require a simple security relearn procedure, which can be done without any special tools and instructions can be provided.
Where is the PCM located on my 1998 Buick LeSabre?
On the 1998 Buick LeSabre, the Powertrain Control Module is typically located inside the air filter housing in the engine compartment. This placement helps keep it cool and protected. Always disconnect the battery before attempting removal or installation.
Will this fix my transmission shifting problems?
If your transmission issues are caused by faulty electronic signals from the PCM, then yes, this part is very likely to solve the problem. The PCM controls the transmission solenoids that manage shifting. If the transmission itself has internal mechanical damage, this part will not fix that.
What if I have a different service number on my original part?
This module replaces several service numbers, including 09356741, 16236757, 9357034, and others listed. As long as your vehicle is on the compatibility list and you provide the correct VIN, this module will function correctly as a replacement.