Restore Peak Performance to Your GM Vehicle
Is your 2004-2005 Pontiac Bonneville, or another compatible GM vehicle, suffering from perplexing issues like a persistent Check Engine Light, erratic shifting, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle’s engine and transmission. This replacement PCM, part number 89017735, is the definitive solution to restore your vehicle’s original performance, reliability, and efficiency.
Unlike generic modules that require expensive trips to the dealership for programming, this unit arrives at your door completely pre-programmed for your specific vehicle. We use your Vehicle Identification Number (VIN) to flash the module with the latest, most stable software updates directly from GM. This ensures seamless integration and communication with all other onboard computers, providing a true plug-and-play repair experience.
From the Diagnostic Bay
We had a 2005 Buick LeSabre come in with a complaint of intermittent stalling at stoplights and a harsh 1-2 shift. The check engine light was on, and the owner had already replaced the spark plugs and a few sensors with no luck. A scan revealed communication error codes with the transmission module and an erratic MAF sensor reading, even though the sensor was new. This pointed us directly to the PCM. The internal processors were failing, corrupting data streams between components. After installing a VIN-programmed PCM just like this one and performing a quick security relearn, the car ran perfectly. The harsh shift was gone, the idle was stable, and all communication codes cleared. It’s a reminder that when multiple, unrelated electronic issues pop up, the central computer is often the root cause.
Symptoms of a Failing GM Powertrain Control Module
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Unexplained drop in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or rough idling.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
The Importance of a VIN-Programmed 2004-2005 Bonneville PCM
The PCM in your GM vehicle does more than just manage fuel and spark. It’s the central hub of a complex network, constantly communicating with the Body Control Module (BCM), Transmission Control Module (TCM), Anti-lock Brake System (ABS), and more. Using a generic, non-programmed module will break these communication links, leading to a host of new problems. Our professional programming service uses your VIN to load the exact software calibration your vehicle was built with, including any subsequent factory updates. This guarantees that all systems function in harmony, just as the engineers intended. This module is a direct replacement for part numbers 12583827 and 12583826.
Simple, Hassle-Free Installation Process
Getting your vehicle back on the road is straightforward. After you complete your purchase, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then program the module and ship it to you. Once it arrives, disconnect the battery, swap the old module with the new one, and reconnect the battery. In most cases, you will need to perform a simple security relearn procedure (often called a “key-on/key-off” cycle), which can be done in your driveway without any special tools. Instructions for this procedure are readily available and easy to follow.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. This module comes fully programmed to your vehicle’s specific VIN before it is shipped. It is ready for installation right out of the box, saving you time and the high cost of dealership programming.
How do I provide my VIN?
After you place your order, you will receive instructions on how to send us your 17-digit VIN. You can typically find your VIN on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
What is a security relearn procedure?
A security relearn, or anti-theft relearn, synchronizes the new PCM with your vehicle’s existing anti-theft system. It usually involves a series of key cycles (e.g., turning the key to ‘ON’ for 10 minutes, then ‘OFF’, and repeating two more times). This allows the vehicle to recognize the new module and permit it to start.
Is this compatible with other part numbers?
Yes, this PCM with service number 89017735 is a direct, compatible replacement for modules with part numbers 12583827 and 12583826.
Will this fix my transmission shifting problems?
In many GM vehicles of this era, the PCM controls both engine and transmission functions. If your shifting issues are caused by faulty electronic signals or a failing computer, replacing the PCM is very often the correct fix.