Is Your GM Vehicle Running Rough? It Could Be The PCM.
If you’re experiencing erratic engine behavior, stalling, a persistent check engine light, or a complete no-start condition in your 1999 Oldsmobile Silhouette or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is a very likely culprit. The PCM, often called the engine computer, is the electronic brain of your vehicle. It controls critical functions like fuel injection, ignition timing, and transmission shifting. When it fails, it can cause a cascade of frustrating and hard-to-diagnose problems.
Don’t let a faulty computer keep your reliable vehicle off the road. This is a genuine, used GM Powertrain Control Module, part number 09361735, meticulously tested and ready for installation. We take the guesswork out of the repair by programming the module specifically for your vehicle using the VIN you provide. This ensures that it communicates perfectly with all other systems, just like the original unit from the factory.
From the Diagnostic Bay
We had a 1999 Pontiac Grand Prix come in on a tow truck. The customer had already replaced the spark plugs, wires, and even the fuel pump, chasing a random stalling and misfire issue. The codes were all over the place—O2 sensor faults, random misfire, communication errors. After checking the wiring and sensors, we hooked up our scope to the PCM outputs. We found the injector driver for cylinder 3 was dropping out intermittently. A quick swap with one of our VIN-programmed 09361735 modules and the car ran perfectly. The customer had spent hundreds on parts they didn’t need when the core issue was the engine computer all along. Always check the basics, but don’t rule out the brain of the operation.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various, often confusing, trouble codes.
- ✔ Engine stalling or shutting off randomly while driving.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine misfires, stumbles, or runs rough.
- ✔ The vehicle won’t start at all, even with a good battery and starter.
- ✔ Failure to pass an emissions test.
- ✔ Communication errors with diagnostic scan tools.
Why Choose Our Programmed 1999 Silhouette PCM?
Replacing a PCM isn’t just about swapping a box. Modern vehicles have sophisticated anti-theft systems and vehicle-specific parameters that are stored in the computer. Simply installing a used module from another vehicle will result in a no-start condition. Our service eliminates this problem. We flash the module with the latest GM-certified software updates and program it to your vehicle’s specific Vehicle Identification Number (VIN). This makes the installation process as close to plug-and-play as possible, saving you a costly trip to the dealership for programming.
This unit is a direct-fit replacement for a wide range of popular GM vehicles from the late 90s and early 2000s, including the Pontiac Grand Prix, Chevrolet Impala, Buick LeSabre, and many more. Please verify the part number 09361735 and consult the detailed fitment list to ensure compatibility with your exact model and options.
Installation and Next Steps
After you purchase this 1999 Silhouette PCM, please send us your vehicle’s VIN. We cannot ship the module until we have this information to complete the programming. Installation is straightforward for a knowledgeable DIYer or any professional mechanic. It typically involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it from its bracket, and installing the new one in its place. After installation, some vehicles may require a security relearn procedure, which can often be done without special tools. We recommend consulting a service manual for the specific steps for your vehicle.
Frequently Asked Questions
Do I need to send you my old computer?
No, there is no core charge or need to send your old part to us. This is an outright purchase of a replacement module.
What is VIN programming and why is it necessary?
VIN programming involves loading your vehicle’s specific identification number and factory-correct software onto the replacement PCM. This is crucial for the module to communicate with your car’s engine, transmission, and anti-theft system. Without it, the vehicle will not start or run correctly.
Is this a new part?
No, this is a genuine, used OEM part sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure it is fully functional before being programmed and shipped.
Will this fix my car’s problem for sure?
While this PCM will solve issues caused by a faulty computer, it’s important to ensure your vehicle has been properly diagnosed. Problems like bad wiring, faulty sensors, or other failing modules can sometimes mimic PCM failure. We recommend a thorough diagnosis by a qualified mechanic before purchasing.
What happens after I install the new PCM?
After installing the VIN-programmed PCM and reconnecting the battery, your vehicle should start and run. Some models may require a simple security relearn procedure (often called a ‘key cycle’). We recommend clearing any old trouble codes with a scan tool after installation.