Restore Peak Performance to Your GM Vehicle
Is your 2003-2005 Buick Century, Impala, Grand Am, or another GM vehicle suffering from perplexing issues like a persistent check engine light, erratic shifting, stalling, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that governs your engine and transmission. A faulty PCM can disrupt communication between critical systems, leading to poor performance, decreased fuel economy, and frustrating diagnostic dead ends. This replacement Powertrain Control Module, part number 89017735, is the definitive solution to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
I once had a 2004 Chevy Impala in the shop with the most frustrating intermittent no-start condition. It would run perfectly for days, then refuse to crank. The owner had already replaced the battery and starter. When it acted up, I’d get a fleeting P0601 (Internal Control Module Memory Check Sum Error) code that would vanish upon a restart. After hours chasing phantom wiring issues, we swapped in a correctly programmed PCM. The problem never returned. These modules can fail internally in ways that mimic a dozen other problems, making a quality, correctly programmed replacement the only true fix.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with communication-related codes (U-codes) or internal processor fault codes (P06xx).
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Unexplained engine stalling or stumbling, especially when warm.
- ✔ Intermittent or complete no-start condition where the engine cranks but won’t fire.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Failure to pass state emissions testing due to module-related faults.
- ✔ Inaccurate or non-functioning dashboard gauges.
The Importance of a VIN-Programmed Century Powertrain Control Module
Simply installing a used module from another vehicle will not work. Modern vehicle systems are intricately linked, and the PCM must be programmed with the specific software and calibrations for your car’s unique Vehicle Identification Number (VIN). This ensures all components, from the fuel injectors to the transmission solenoids and anti-theft system, operate in perfect harmony. We take the guesswork out of the repair. When you purchase this 2003-2005 Century Powertrain Control Module, we flash it with the latest official GM software updates using your VIN. This means it arrives at your door ready for installation, saving you a costly trip to the dealership for programming.
This module is a direct replacement for part numbers 89017735, 12583827, and 12583826, and it fits a wide range of popular GM vehicles, including:
- 2003-2005 Buick Century & LeSabre
- 2003-2005 Pontiac Grand Am, Aztek, Bonneville, & Montana
- 2003-2005 Chevrolet Impala, Monte Carlo, & Venture
- And many more models listed in the fitment guide.
Don’t let a faulty computer keep your car off the road. This professionally programmed 2003-2005 Century Powertrain Control Module is the most reliable and efficient way to solve complex electronic issues and get your vehicle running like new again.
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will load the latest GM software specific to your car.
Is installation difficult?
The physical installation is straightforward, typically involving disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. However, after installation, you will need to perform a security relearn procedure (also known as a CASE relearn or Passlock relearn) so the module can sync with your vehicle’s anti-theft system. This procedure can be done without special tools and instructions are readily available online.
How do I provide my VIN?
You can add your VIN to the notes section during checkout or simply reply to your order confirmation email with the information. Please double-check it for accuracy.
What happens if I forget to send my VIN?
We cannot ship the module without your VIN, as it is essential for the programming process. Our team will contact you via email to request the information if it is not provided with the order, which may delay shipment.
Will this fix my car’s hard shifting?
In many cases, yes. The PCM controls transmission line pressure and shift points, so a failing module is a very common cause of shifting problems. However, you should always ensure that mechanical issues, like low fluid or failing solenoids, have been ruled out by a qualified technician.
My car is a 2004 Pontiac Grand Prix. Will this fit?
While the title highlights the Buick Century, this module fits a very wide range of 2003-2005 GM vehicles. Please consult the detailed fitment list on this page to confirm compatibility with your specific year, make, and model.