Is Your GM Vehicle Experiencing Engine or Transmission Problems?
If your 2003-2005 Pontiac Aztek, Rendezvous, Impala, or other compatible GM vehicle is suffering from erratic behavior, poor performance, or won’t start, a failing Powertrain Control Module (PCM) is a likely culprit. The PCM is the central computer, the brain of your vehicle’s engine and transmission. It controls everything from fuel injection and spark timing to transmission shift points. When it fails, it can cause a cascade of confusing and frustrating issues that can be difficult to diagnose.
We once had a 2004 Buick Century come in with a persistent P0300 random misfire code. The owner had already spent a small fortune replacing spark plugs, wires, the ignition control module, and even a fuel injector. The misfire was intermittent but getting worse. After hooking up our diagnostic scope, we noticed the control signal to the #3 fuel injector was dropping out randomly. The injector itself was fine, the wiring was solid—the issue was inside the PCM. The injector driver circuit was failing under load. A replacement, correctly programmed PCM like this one solved the problem instantly, saving the customer from more unnecessary parts replacements.
Common Symptoms of a Failing PCM
A faulty engine computer can manifest in numerous ways. If you’re noticing any of the following, it’s time to consider a replacement 2003-2005 Aztek PCM:
- ✔ Check Engine Light is on with communication-related or internal processor fault codes (e.g., P0601, P0606).
- ✔ Harsh, delayed, or erratic automatic transmission shifting.
- ✔ The engine cranks but refuses to start, or starts and immediately stalls.
- ✔ A noticeable drop in fuel economy for no apparent reason.
- ✔ Engine misfires, stumbling, or hesitation during acceleration.
- ✔ Your diagnostic scan tool cannot communicate with the PCM.
- ✔ Intermittent issues that seem to have no pattern and disappear upon restart.
The Direct-Fit, Programmed Solution: Part 89017735
This Powertrain Control Module is the definitive solution to restore your vehicle’s performance and reliability. We eliminate the most significant hurdle in this repair: the programming. Dealerships and repair shops charge hundreds for programming services alone. We handle it for you. Simply provide your vehicle’s 17-digit VIN during checkout, and our technicians will flash the module with the latest GM-certified software specific to your car. This ensures all systems, from the engine and transmission to the anti-theft system, function exactly as they did from the factory.
This module is a direct replacement for part numbers 89017735, 12583827, and 12583826, and fits a wide range of popular GM models, including:
- 2003-2005 Pontiac Aztek
- 2003-2005 Buick Rendezvous
- 2003-2005 Chevrolet Impala & Monte Carlo
- 2003-2005 Buick Century & LeSabre
- 2003-2005 Pontiac Grand Am & Grand Prix
- And many more (please verify fitment).
Simple Installation Process
Once you receive your pre-programmed 2003-2005 Aztek PCM, the physical installation is straightforward. It is typically located in the engine compartment on the driver’s side. After swapping the module, you will need to perform a simple security relearn procedure (also known as VATS or Passlock). This procedure pairs the new module to your existing keys and can be done in your driveway without any special tools—it typically involves a series of key cycles. Instructions are readily available online for your specific model. In some cases, a Crankshaft Position Sensor (CASE) relearn may be required with a capable scan tool to clear a P1336 code, but the vehicle will run and drive without it.
Frequently Asked Questions
Do I need to have this module programmed?
No. This is the core of our service. We program the module with your vehicle’s specific VIN before we ship it to you. It arrives ready for installation and the final security relearn procedure.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM with your vehicle’s anti-theft system. It usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this two more times. This allows the Body Control Module and PCM to recognize each other.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM (with codes like P0601, for example), then yes, this part will resolve the issue. However, if the light is on for another reason, such as a bad oxygen sensor or catalytic converter, you will still need to address that separate problem.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information.
Is this compatible with my vehicle?
This module fits a wide range of GM vehicles from 2003-2005. It directly replaces part numbers 89017735, 12583827, and 12583826. Please check the detailed fitment list on this page or contact us with your VIN to confirm compatibility.