Restore Peak Performance to Your GM Vehicle
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, poor fuel economy, or harsh transmission shifting, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its health is critical. This replacement PCM, part number 89017735, is the definitive solution for a wide range of 2003-2005 GM vehicles, including the Pontiac Grand Am. With over 20 years of diagnostic experience, I’ve seen firsthand how a failing module can mimic dozens of other problems. Replacing it with a reliable, correctly programmed unit is the most effective way to get your car back on the road and running as it should.
What sets this module apart is our professional programming service. Before we ship it, we flash the unit with the latest GM-certified software updates, tailored specifically to your vehicle using its unique VIN. This eliminates the need for an expensive trip to the dealership for programming. It arrives at your door ready for installation, making this a straightforward repair for a professional technician or a confident DIYer. This isn’t just a replacement part; it’s a restoration of your vehicle’s core operational logic, ensuring all components work in harmony.
Case Study: The Ghost in the Grand Prix
I remember a 2003 Grand Prix with the 3.1L V6 that came into the shop with a maddeningly intermittent stalling problem. The owner had already replaced the fuel pump and crank sensor with no luck. The car would run fine for days, then suddenly die at a stoplight. No codes were stored initially. After hooking up a live data scanner and driving it for an hour, I finally caught it: the 5-volt reference signal to the sensors would momentarily drop out, just before the engine quit. This pointed directly to an internal failure in the PCM. We installed a VIN-programmed module just like this one, and the problem was solved permanently. It’s a classic example of how a faulty 2003-2005 Grand Am PCM can create phantom issues that are otherwise impossible to trace.
Is Your GM Vehicle Showing These Symptoms?
A failing PCM can cause a wide array of problems. If you’re noticing any of the following, it’s time to consider a replacement:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Stored diagnostic trouble codes (DTCs) like P0601, P0602, or P0606 (Internal Module Failure)
- ✔ Engine stalling, stumbling, or refusing to start
- ✔ Poor or inconsistent fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to communicate with a diagnostic scan tool
- ✔ Unexplained loss of power or hesitation during acceleration
A Straightforward Guide to Installation
Installing your new 2003-2005 Grand Am PCM is a manageable job. While the exact location varies slightly by model, it’s typically found in the engine compartment or under the dash. Always consult a service manual for your specific vehicle.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all systems to discharge.
- Locate the PCM: On many models like the Grand Am and Alero, the PCM is located on the left-hand (driver’s) side, under the center of the dashboard. On others like the Century or Rendezvous, it’s in the engine compartment.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors often have locking tabs that need to be released before pulling. Do not force them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Secure the new, pre-programmed PCM into the mounting bracket. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Relearn Procedure (If Necessary): While the module is pre-programmed, some GM vehicles require a security or CASE (Crankshaft Angle Sensor Error) relearn procedure after installation. This can often be done with a capable scan tool or by following a specific key-cycling procedure.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12583827 and 12583826. It is guaranteed to fit the following models with the specified options. Please verify your vehicle’s details before ordering.
- Alero: 2003-2004 (3.4L)
- Aztek: 2003-2005
- Bonneville: 2004-2005 (3.8L)
- Century: 2003-2005
- Grand Am: 2003-2005 (3.4L)
- Grand Prix: 2003 (3.1L)
- Impala: 2003-2005 (3.4L options)
- LeSabre: 2004-2005
- Malibu: 2003
- Monte Carlo: 2003-2005 (3.4L options)
- Montana: 2003-2005
- Park Avenue: 2004-2005
- Rendezvous: 2003-2005
- Silhouette: 2003-2004
- Venture: 2003-2005
Do I need to do any programming myself?
Do I need to do any programming myself?
No. We handle all the programming before shipping. You just need to provide your vehicle’s 17-digit VIN during checkout. The module will arrive with the latest GM software, ready for installation.
What is a VIN and where do I find it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your car. You can typically find it on the driver’s side of the dashboard (visible through the windshield), 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 an internal PCM failure (like codes P0601-P0606), then yes, this part will resolve the issue. However, you should always have your vehicle scanned to confirm the codes before ordering, as the light can indicate many other potential problems.
Is a CASE relearn required after installation?
For many GM vehicles of this era, a CASE (Crankshaft Angle Sensor Error) relearn is recommended to ensure optimal engine timing and prevent a P1336 trouble code. This procedure requires a bi-directional scan tool and is a standard final step for any professional installation.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part. Each unit is verified for full functionality before being professionally programmed with the latest software for your specific vehicle, ensuring reliability and perfect fitment.