Restore Your Vehicle’s Brain and Brawn
Is your Pontiac Montana, Chevy Venture, or Buick Rendezvous running rough, stalling unexpectedly, or showing a persistent Check Engine Light? The Powertrain Control Module (PCM), often called the Electronic Control Module (ECM), is the central computer responsible for managing your engine’s performance, fuel economy, and transmission shifting. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose issues. This replacement PCM, part number 89017735, is the definitive solution to restore your vehicle’s factory performance and reliability.
Unlike generic modules that require expensive dealership programming, this unit is meticulously prepared for your specific vehicle. Before we ship it, we flash the module with the latest official GM software updates using the Vehicle Identification Number (VIN) you provide. This critical step ensures that the computer has the correct operational parameters for your engine, transmission, and emissions equipment, making the installation process as straightforward as possible.
From the Diagnostic Bay
We had a 2004 Buick Rendezvous come into the shop that was driving the owner crazy. It would randomly stall at red lights, but only after it had been running for 20-30 minutes. No check engine light, no consistent codes. The owner had already replaced the crank sensor and the ignition control module at another shop to no avail. We hooked up our diagnostic scanner and monitored live data. Everything looked normal until the engine warmed up completely. We then saw the PCM’s internal processor data stream start to glitch. A faulty processor on the circuit board was failing under heat. We installed one of these VIN-programmed modules, performed the security relearn, and the problem was gone for good. It’s a classic example of how a failing PCM can mimic other component failures, making a quality, correctly programmed replacement essential.
Common Symptoms of a Failing PCM
If you’re experiencing any of the following issues, a faulty powertrain module could be the culprit. A failing computer can often send you chasing ghosts, replacing perfectly good sensors. Verifying the source of the problem is key, and these symptoms are strong indicators that the module itself is the issue.
- ✔ Check Engine Light: Often with internal processor fault codes like P0601, P0602, or P0606.
- ✔ Engine Stalling or Misfiring: The engine may stall for no reason, run rough, or hesitate during acceleration.
- ✔ Poor Fuel Economy: Incorrect fuel and air mixture calculations can lead to a sudden drop in MPG.
- ✔ Harsh or Failed Shifting: The PCM controls the transmission solenoids, and a failure can cause erratic shifting or getting stuck in one gear.
- ✔ No-Start Condition: The module may fail to activate the fuel pump or ignition coils, preventing the engine from starting.
- ✔ Communication Errors: Your mechanic’s scan tool may be unable to communicate with the PCM.
The Right Solution: A Pre-Programmed Montana Powertrain Control Module
Don’t settle for a junkyard part with unknown history or a generic unit that requires a tow to the dealer. Our process ensures you receive a reliable component that is ready for installation. By programming the module to your VIN, we ensure it communicates seamlessly with the other computers in your vehicle, like the Body Control Module (BCM) and Anti-lock Brake System (ABS). This Montana Powertrain Control Module is tested to meet or exceed original equipment specifications, providing a dependable and long-lasting repair for your vehicle.
This module is a direct replacement for multiple GM part numbers, including 12583827 and 12583826. It fits a wide range of popular GM vehicles from 2003 to 2005, including the Impala, Monte Carlo, Grand Am, Aztek, and more. Please verify the part number on your original module or consult the detailed fitment list to confirm compatibility.
Frequently Asked Questions
What is VIN programming and why is it necessary?
VIN programming is the process of loading your vehicle’s specific software and calibration files onto the module. This is essential because GM uses the same hardware for many different models with different engines, transmissions, and options. The VIN tells the module exactly how to operate your specific vehicle, ensuring proper engine performance, transmission shifting, and emissions compliance.
Is this a plug-and-play part?
Because we program the module to your VIN, it is as close to plug-and-play as possible. After physical installation, you may need to perform a simple security relearn procedure, which can often be done without special tools and involves a sequence of key turns. Instructions are widely available online for this process. In some cases, a Crankshaft Variation Relearn (CASE relearn) may be needed, which requires a capable bidirectional scan tool.
How do I provide my VIN?
After you complete your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your module until we receive this information, as the programming is the most critical step of the process. You can find your VIN on your vehicle’s registration, insurance card, or on the driver’s side dashboard visible through the windshield.
Will this fix my check engine light?
If the check engine light is on due to an internal fault with your original PCM (like a P0601 code), this replacement module will solve the problem. However, if the light is on for another reason, such as a faulty oxygen sensor or catalytic converter, you will still need to address that separate issue. This module will fix problems directly caused by the PCM itself.
What if my part number isn’t an exact match to 89017735?
This module is a direct replacement for several part numbers, including 12583827 and 12583826. Please check the comprehensive fitment list on this page. If your vehicle is listed, this module is the correct replacement, even if your original part number is slightly different. The key is the VIN programming, which makes it compatible.