Restore Peak Performance to Your Vehicle with a VIN-Programmed PCM
Is your 1999 Oldsmobile Alero or another compatible GM vehicle suffering from frustrating drivability issues? A faulty Powertrain Control Module (PCM), the central computer of your car, is often the culprit behind a wide range of problems, from poor engine performance and erratic transmission shifting to a dreaded no-start condition. This replacement PCM is the definitive solution, arriving at your doorstep fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest official GM software updates, ensuring optimal performance, fuel efficiency, and emissions control right out of the box.
From the Diagnostic Bay
We had a 1999 Grand Am come in with a complaint of harsh, unpredictable shifting, especially from 1st to 2nd gear. The owner had already spent a small fortune replacing the transmission solenoids and fluid, with no improvement. After hooking up our scanner, we noticed the PCM wasn’t commanding the line pressure correctly. Instead of another costly transmission repair, we installed a VIN-programmed PCM like this one. After a quick security relearn, the car shifted like it just rolled off the factory floor. It’s a classic case where the brain, not the muscle, was the real problem.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various trouble codes (DTCs).
- ✔ Engine stalling, sputtering, or misfiring.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ A significant drop in fuel economy (MPG).
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Intermittent issues that seem to have no other logical cause.
The Heart of Your Vehicle’s Operation: The 1999 Alero PCM
The Powertrain Control Module is responsible for managing dozens of critical functions. It takes data from sensors all over your engine and transmission to control fuel injection, ignition timing, variable valve timing, transmission shift points, and emissions systems. When it begins to fail, the entire operation of your vehicle is compromised. Our process ensures that your replacement module is not a generic, one-size-fits-all part. By programming it directly to your VIN, we guarantee that it has the exact calibration and software your Alero, Grand Am, or other compatible model requires for seamless integration and correct operation.
Plug-and-Play Installation Process
We make the replacement process as straightforward as possible. Once you place your order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash the module with the correct GM-certified software. When the part arrives, installation is typically simple:
- Disconnect the Battery: Always start by disconnecting the negative battery terminal for safety.
- Locate and Replace the PCM: On most of these vehicles, the PCM is located in the center dash area or engine compartment. Disconnect the wiring harnesses, unbolt the old unit, and install the new one.
- Perform a Security Relearn: After reconnecting the battery, you will need to perform a simple key-cycle procedure to sync the new PCM with your vehicle’s anti-theft system. This procedure takes about 30 minutes and does not require any special tools. We include clear instructions to guide you.
This module is a direct replacement for multiple service numbers, including 09356741, 16236757, 9357034, 9357440, and 9366314, ensuring broad compatibility across a range of GM vehicles from this era. Restore the reliability and drivability you depend on with this precision-programmed powertrain control module.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact, factory-correct software and calibrations for your specific vehicle. This includes information about the engine, transmission, emissions equipment, and other options, ensuring the module works perfectly upon installation.
Is this module difficult to install?
For someone with basic mechanical skills, the installation is very manageable. It involves disconnecting the battery, unplugging the electrical connectors, removing a few bolts, and swapping the unit. The most important post-installation step is the security relearn procedure, which we provide instructions for.
Will I need to take my car to a dealer after installation?
No. Because we program the module to your VIN before shipping, you will not need to visit a dealer or mechanic for additional programming. You will only need to perform the simple security relearn procedure at home.
How can I be sure this fits my vehicle?
This module fits a wide range of GM vehicles from 1998-1999. Please check the compatibility list on this page. The best way to confirm is to match the service number on your original module to one of the numbers listed, such as 09356741 or 16236757.
What is the security relearn procedure?
It’s a simple process that syncs the new PCM to your car’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this cycle three times. This allows the components to recognize each other. We include detailed instructions with your order.