Restore Peak Performance to Your GM Vehicle
Is your Pontiac Grand Am, Chevy Impala, or Buick Century suffering from a persistent check engine light, erratic shifting, or a frustrating no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the computer that serves as your vehicle’s brain. A faulty PCM can disrupt everything from fuel delivery and ignition timing to transmission operation, leading to poor performance and failed emissions tests. This replacement PCM, part number 89017735, is the reliable, straightforward solution to get your car running smoothly again.
What sets this module apart is our professional programming service. Forget expensive dealership visits and the hassle of finding a shop with the right equipment. Simply provide your vehicle’s VIN at checkout, and our technicians will flash this module with the latest, most stable GM factory software specific to your car. It arrives at your door ready for installation, making this a job any confident DIYer can handle in their own garage.
A Technician’s Notebook: The Intermittent Stall Mystery
I had a 2004 Grand Am in the bay last month that was giving its owner fits. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. There were no consistent trouble codes, just a history of random communication errors. We checked fuel pressure, spark, and sensors—all tested fine. On a hunch, I put a scope on the PCM’s main processor and saw the voltage drop out intermittently. The internal circuits were failing under heat soak. We replaced it with one of these pre-programmed PCMs. The customer called a week later, thrilled that the problem was completely gone. It’s a textbook example of how a failing 2003-2005 Grand Am PCM can create ghost-in-the-machine problems that a simple replacement can solve.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light (CEL) is illuminated
- ✔ Stored diagnostic trouble codes (DTCs) like P0601, P0602, or P0606 (Internal Control Module Memory Check Sum Error)
- ✔ Engine stalls, idles roughly, or misfires
- ✔ Vehicle won’t start or is difficult to start
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Failure to pass state emissions inspections
A Straightforward Guide to Installation
Installing your new 2003-2005 Grand Am PCM is a manageable task. On the Grand Am and Alero, the module is typically located behind the left-hand side of the center dash console. For most other listed GM vehicles, it’s found in the engine compartment on the driver’s side, often near the air filter box.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: Find the existing module in your vehicle. You may need to remove a plastic cover or panel for access.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. They often have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect the negative battery terminal.
- Final Step: Some vehicles may require a security relearn procedure, which can typically be done by cycling the key. Turn the ignition to ‘ON’ for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeat two more times before starting the engine.
Will This Fit My Vehicle?
This module is a direct replacement for part numbers 89017735, 12583827, and 12583826. It is guaranteed to fit the following models. Please verify your specific options.
Aztek: 2003 (ID 12583827), 2004-2005
Bonneville: 2004-2005 (3.8L)
Century: 2003-2005
Grand Am: 2003 (3.4L, ID 12583827), 2004-2005 (3.4L)
Grand Prix: 2003 (3.1L, ID 12583827)
Impala: 2003 (3.4L, ID 12583827), 2004-2005
LeSabre: 2004-2005
Malibu: 2003 (ID 12583827)
Monte Carlo: 2003 (3.4L, ID 12583827), 2004-2005
Montana: 2003-2004, 2005 (Base)
Park Avenue: 2004 (ID 12583827), 2005
Rendezvous: 2003-2005 (ID 12583827)
Silhouette: 2003-2004
Venture: 2003 (ID 12583827), 2004-2005
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Because we program it to your VIN, it’s largely a plug-and-play installation. However, some GM vehicles require a simple security relearn procedure (often called a CASE learn or Passlock relearn) which can be done without special tools. Instructions are easy to find online or in your service manual.
What information do you need from me?
We need your vehicle’s 17-digit Vehicle Identification Number (VIN). Please provide it during checkout or send it to us in a message after your purchase. We cannot ship your module until we have your VIN to program it correctly.
Is this a new or used part?
This is a quality, inspected, and tested recycled OEM part. Each unit is verified for full functionality before being programmed with the latest GM software for your specific vehicle.
Will this fix my transmission problems?
In many GM vehicles of this era, the PCM also controls the transmission. If your shifting problems are caused by faulty electronic commands from a failing PCM, then yes, this new module will resolve those issues.
How do I find my original part number to confirm a match?
Your original part number is printed on a sticker on the PCM itself. This module replaces part numbers 89017735, 12583827, and 12583826. As long as your vehicle is on our fitment list, this part will work.