Is your 2003 or 2004 Oldsmobile Alero suffering from perplexing issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition? These are classic symptoms of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. When the PCM begins to fail, it can disrupt communication between critical systems, leading to a cascade of performance problems that can be difficult to diagnose. This replacement PCM, part number 89017735, is the definitive solution to restore your vehicle’s factory performance and reliability.
The PCM is responsible for managing dozens of complex operations every second your engine is running. It controls fuel injection timing, ignition spark, transmission shift points, and emissions systems to ensure optimal power, efficiency, and compliance. Over time, heat, vibration, and electrical fluctuations can degrade the internal components of the original module, causing intermittent or complete failure. Simply swapping in a used module from another vehicle won’t work, as these units are coded specifically to the Vehicle Identification Number (VIN) of the original car. Our service eliminates that roadblock.
We had a 2004 Grand Am with the 3.4L V6 come in on a tow truck. The customer had replaced the battery, alternator, and even the fuel pump, but the car would crank but not start. Scans showed a U-code, indicating a loss of communication with the PCM. After verifying power and ground to the module, we suspected an internal failure. We ordered one of these VIN-programmed modules, installed it, performed a quick security relearn, and the car fired right up and ran perfectly. It saved the customer from chasing phantom electrical gremlins for weeks.
Diagnosing a Faulty 2003-2004 Alero PCM
If you’re experiencing any of the following symptoms, a failing powertrain control module could be the culprit. A faulty PCM can mimic other component failures, so it’s crucial to recognize the signs. Look out for:
- ✔ Illuminated Check Engine Light: Often the first and most obvious sign, with codes related to module communication or processor errors.
- ✔ Engine Performance Issues: Stalling, rough idling, hesitation during acceleration, or a noticeable loss of power.
- ✔ Poor Fuel Economy: If the PCM can’t properly manage the air-fuel mixture, your gas mileage will suffer significantly.
- ✔ Transmission Shifting Problems: Harsh shifting, delayed engagement, or getting stuck in one gear (limp mode) can be caused by the PCM.
- ✔ No-Start Condition: The engine may crank but will not start if the PCM fails to control the ignition or fuel systems.
- ✔ Intermittent Electrical Gremlins: Seemingly unrelated warning lights or component failures can sometimes be traced back to a faulty PCM.
The Plug-and-Play Solution
This isn’t just a part; it’s a complete service. We take the guesswork and hassle out of replacing your vehicle’s computer. When you purchase this module, you provide us with your vehicle’s VIN. Our technicians then flash the module with the latest, most up-to-date OEM software directly from General Motors. This ensures that the PCM is perfectly matched to your Alero’s specific configuration, including its engine, transmission, and factory options. The result is a module that is ready for installation right out of the box, significantly reducing vehicle downtime and eliminating the need for expensive dealership programming.
This module is a direct replacement for original part numbers 89017735, 12583827, and 12583826. It is compatible with a wide range of GM vehicles from 2003 to 2005. Please verify the fitment list below to ensure compatibility with your specific make and model.
Extensive GM Compatibility:
This electronic control module fits a variety of popular GM models, including:
- Oldsmobile Alero: 2003-2004 (3.4L)
- Pontiac Grand Am: 2003-2005 (3.4L)
- Chevrolet Impala & Monte Carlo: 2003-2005
- Buick Century & LeSabre: 2003-2005
- Pontiac Aztek & Montana: 2003-2005
- Buick Rendezvous: 2003-2005
- And many more listed in the compatibility chart.
Frequently Asked Questions
Do I need to get this module programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the latest GM software specific to your car.
Where is the PCM located on my 2003-2004 Alero?
On the 2003-2004 Oldsmobile Alero, the Powertrain Control Module is typically located on the left-hand (driver’s) side, in the center of the dash area. Access may require removing some lower dash panels.
Will I need to do anything after installation?
In many cases, the vehicle will start and run perfectly after installation. However, some GM vehicles may require a simple security relearn procedure (often called a Passlock or VATS relearn) which can be done without special tools. Instructions for this are widely available online.
Is this a new or used part?
This is a high-quality, inspected, and tested replacement part that is guaranteed to function correctly. It is prepared with fresh, vehicle-specific software to ensure reliability.
What information do you need from me?
We need your 17-digit Vehicle Identification Number (VIN). This allows us to access the correct GM software and calibrations for your exact vehicle build, ensuring a perfect match and proper function.