Is Your Buick LeSabre Running Rough? The PCM Might Be the Culprit.
If your 1998 Buick LeSabre, or another compatible GM vehicle, is experiencing frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition, a failing Powertrain Control Module (PCM) is often the root cause. As the central computer of your vehicle, the PCM controls everything from fuel injection and ignition timing to transmission shift points and emissions systems. When it begins to fail, it can create a cascade of problems that are difficult to diagnose and can leave you stranded.
Don’t let a faulty computer dictate your vehicle’s reliability. This replacement Powertrain Control Module, corresponding to part number 9356741, is the definitive solution to restore your vehicle’s performance, drivability, and efficiency. We take the guesswork and complexity out of the repair by programming the module specifically for your vehicle using your VIN. This ensures that all factory settings and the latest GM software updates are loaded, making the installation process as seamless as possible.
From the Diagnostic Bay
We had a 1998 Park Avenue come into the shop with a complaint of intermittent stalling and a harsh 1-2 shift. The owner had already replaced the throttle position sensor and the mass airflow sensor with no improvement. After hooking up our diagnostic scanner, we noticed erratic data readings from multiple sensors that didn’t make sense together. Instead of continuing to chase individual sensor codes, we focused on the central hub: the PCM. A quick check of the PCM’s power and ground circuits confirmed they were solid, pointing to an internal failure of the module itself. We installed a VIN-programmed PCM, performed the security relearn, and the car ran like new. It’s a classic case of how a failing computer can send you on a wild goose chase, and why starting with a reliable, correctly programmed module is key to an effective repair.
Common Symptoms of a Failing 1998 LeSabre PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Unexplained drop in fuel mileage.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions or smog test.
- ✔ The engine cranks but refuses to start.
- ✔ Communication errors with diagnostic scan tools.
A Simple, Programmed Solution
Replacing a PCM used to mean a trip to the dealership for expensive programming and calibration. Our process eliminates that step. When you purchase this module, simply provide us with your vehicle’s VIN during or after checkout. Our technicians will use this information to flash the unit with the precise software your vehicle requires. This means the module arrives at your door ready to be installed. While the programming is done for you, some vehicles may require a simple, key-on/key-off security relearn procedure after installation, which can typically be done in your own driveway without any special tools.
This module is a direct replacement for a wide range of GM vehicles from the late 90s, ensuring OEM fit and function. It is compatible with the following service numbers: 09356741, 16236757, 9357034, 9357440, and 9366314.
Guaranteed Fitment For Your Vehicle
This Electronic Control Module is a confirmed fit for the following vehicles, provided the service number on your original part matches one of the compatible numbers listed above:
- 1998-1999 Buick Century / LeSabre / Park Avenue / Regal / Riviera / Skylark
- 1998-1999 Chevrolet Lumina / Malibu / Monte Carlo / Venture
- 1998-1999 Oldsmobile Achieva / Alero / Cutlass / Eighty Eight / Intrigue / Silhouette
- 1998-1999 Pontiac Bonneville / Grand Am / Grand Prix / Trans Sport
- 1998 Chevrolet Camaro / Firebird (3.8L V6 Only)
Restore your vehicle’s brain and get it running reliably again. Order today and provide your VIN to receive a module that’s ready to get you back on the road with confidence.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls the engine and transmission functions by reading data from sensors and making real-time adjustments to fuel delivery, spark timing, and shift patterns to ensure optimal performance, fuel economy, and emissions.
Do I need to program this module?
No. We handle the programming for you before we ship the part. All you need to do is provide us with your vehicle’s 17-digit VIN, and we will load the latest GM-certified software specific to your car.
Where is the PCM located on my 1998 Buick LeSabre?
On the 1998 Buick LeSabre and many similar GM models of that era, the PCM is typically located inside the vehicle’s air filter box in the engine compartment. This placement helps protect it from heat and vibration. Always disconnect the battery before attempting to remove or install the module.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the vehicle first, as the check engine light can be triggered by many other components like faulty sensors or wiring.
What is a security relearn procedure?
After installation, some GM vehicles require a security relearn to sync the new PCM with the vehicle’s anti-theft system. This is usually a simple procedure that involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this cycle three times. Instructions are widely available online for your specific model.