Restore Peak Performance to Your Vehicle
Is your 1999 Oldsmobile Alero or other compatible GM vehicle suffering from frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition? These are classic symptoms of a failing Powertrain Control Module (PCM). The PCM is the electronic brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shift points. When it fails, the entire system can become unreliable. This replacement Powertrain Control Module, part number 9356741, is the definitive solution to get your car running smoothly and reliably again.
Common Symptoms of a Failing 1999 Alero PCM
A faulty PCM can manifest in various ways, often mimicking other component failures. If you’re experiencing one or more of the following, your PCM is a likely culprit:
- Check Engine Light: The light may be on constantly, or it may illuminate intermittently with codes related to module communication errors, sensor inputs, or transmission controls.
- Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, engine stumbling, or random stalling can all point to a PCM that is not correctly managing the engine.
- Reduced Fuel Economy: If the PCM isn’t calculating the air-fuel mixture correctly, you’ll see a significant drop in your miles per gallon.
- Transmission Problems: Hard or delayed shifting, or getting stuck in a single gear (limp mode), are common signs that the PCM is not communicating properly with the transmission control module.
- No-Start Condition: In severe cases, the PCM can fail to energize the fuel pump or ignition system, preventing the vehicle from starting at all.
From the Diagnostic Bay
We had a 1998 Grand Prix in the shop with a maddening intermittent stalling problem. The owner had replaced the crank sensor, fuel pump, and ignition coils, but the issue persisted. After hours of diagnostics, we found the 5-volt reference signal from the PCM would drop out randomly when the engine warmed up. We installed one of these VIN-programmed PCMs, and the car ran perfectly. It’s a reminder that the PCM is the foundation of the entire engine management system, and a faulty one can send you chasing ghosts all over the engine bay.
Why VIN Programming is Essential
Unlike a simple mechanical part, a modern PCM cannot be swapped directly from one vehicle to another. Each module is programmed with a specific Vehicle Identification Number (VIN) and contains software tailored to that car’s engine, transmission, and options. Our service eliminates the guesswork and the need for expensive dealership programming. When you order, you provide us with your VIN. We then flash this module with the latest, most stable software updates directly from GM for your exact vehicle. This ensures:
- Correct engine and transmission operation.
- Proper function of the anti-theft system (PassLock/VATS).
- Seamless communication with all other onboard modules.
- A true plug-and-play installation experience.
Key Features and Benefits
- ✔ Plug & Play Installation: Arrives pre-programmed to your VIN. No dealership visit required.
- ✔ Restores Original Functionality: Solves common issues like stalling, rough idling, and poor MPG.
- ✔ Updated GM Software: Flashed with the newest software to improve performance and reliability over the original.
- ✔ Direct-Fit Replacement: Matches service numbers 09356741, 16236757, 9357034, 9357440, and 9366314.
- ✔ Broad Compatibility: Fits a wide range of late 90s GM vehicles including the Alero, Grand Am, Century, Malibu, and more.
Don’t let a faulty computer keep you off the road. This professionally programmed 1999 Alero PCM is the most reliable and straightforward way to restore your vehicle’s health and your peace of mind. Simply install the module, and you’re ready to drive.
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 the engine and transmission to ensure optimal performance, fuel efficiency, and low emissions. It takes data from sensors all over the vehicle and makes real-time adjustments.
Do I need to do any programming after I receive this part?
No. This module comes completely programmed to your vehicle’s specific VIN. It is ready for installation right out of the box. In some GM vehicles, a security relearn procedure may be required, which is a simple process that can be done without any special tools.
Where is the PCM located on my 1999 Oldsmobile Alero?
On the 1999 Oldsmobile Alero, the PCM is typically located in the center of the dash, behind the radio or climate control panel. Access often requires removing some interior trim panels.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically find this on your vehicle’s dashboard (visible through the windshield on the driver’s side), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the check engine light is caused by a failing PCM or an issue the PCM controls, then yes, this part will resolve the problem. It is always recommended to have the codes read by a scanner to confirm the diagnosis before ordering.