Is your 2003 Buick LeSabre, Impala, or other GM 3.8L vehicle running poorly, stalling, or showing a persistent check engine light? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain that manages your engine’s performance, fuel economy, and transmission shifting. A faulty PCM can lead to a cascade of frustrating and difficult-to-diagnose issues. This direct-fit replacement PCM, part number 89017735, is the definitive solution to restore your vehicle’s reliability and drivability.
We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store or salvage yard, this unit is professionally programmed specifically for your vehicle using your unique Vehicle Identification Number (VIN). This crucial step ensures that all factory settings, anti-theft systems, and vehicle-specific parameters are correctly configured. We install the latest software updates from General Motors, which often resolve underlying drivability issues that were present even when the car was new. The result is a true plug-and-play solution that gets you back on the road quickly and confidently.
I once had a 2003 Buick Regal in the shop with a textbook case of what seemed like a bad transmission. The shifts were harsh and erratic, and the customer had already replaced the transmission fluid and shift solenoids with no improvement. The scan tool showed a generic transmission communication error code. After hours of chasing wires and testing sensors, we decided to inspect the PCM. We found subtle corrosion on one of the connector pins that was intermittently dropping communication with the transmission control module (which is integrated into the PCM on these models). We installed a VIN-programmed PCM, performed the security relearn, and the car shifted like it just rolled off the factory floor. It’s a powerful reminder that the PCM is the master controller, and its failure can often mimic other component failures, costing you time and money on unnecessary parts.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes
- ✔ Rough or unstable engine idle
- ✔ Engine stalling or cutting out while driving
- ✔ Poor acceleration and overall lack of power
- ✔ Decreased fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Failure to communicate with diagnostic scan tools
Why Choose Our Pre-Programmed 2003 LeSabre PCM?
When you purchase this 2003 LeSabre PCM, you’re not just getting a part; you’re getting a complete, ready-to-install solution. Our process is simple and effective. After placing your order, you provide us with your vehicle’s VIN. Our technicians then use this information to flash the module with the exact software and calibrations your vehicle requires. This ensures seamless integration with your engine, transmission, and existing anti-theft system. This critical programming step is included with your purchase, saving you a costly trip to the dealership and the potential for programming errors.
Simple Installation Process
Replacing the PCM on these GM vehicles is straightforward. It is typically located in the engine bay, often within the air filter box assembly for protection. Once you receive your pre-programmed module, the process is as follows:
- Disconnect the Battery: Always disconnect the negative battery terminal before working on any vehicle electronics.
- Locate and Remove the Old PCM: Unplug the electrical connectors (they have locking tabs) and unbolt the module from its mounting bracket.
- Install the New PCM: Mount the new module, securely reconnect the electrical harnesses, and then reconnect the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple key-relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Your vehicle should then start and run normally.
Guaranteed Fitment and Compatibility
This Powertrain Control Module is a direct replacement for service numbers 89017735 and 12583826. It is guaranteed to fit and function correctly in the following vehicles:
- 2003 Buick LeSabre (with ID 12583826)
- 2003-2004 Buick Regal
- 2003-2004 Buick Park Avenue
- 2003 Chevrolet Impala (3.8L, with ID 12583826 or 89017735)
- 2003 Chevrolet Monte Carlo (3.8L, with ID 12583826)
- 2003 Pontiac Bonneville (with ID 12583826)
- 2003 Pontiac Grand Prix (3.8L, with ID 12583826)
Don’t let a faulty computer keep your reliable GM vehicle off the road. Order this pre-programmed 2003 LeSabre PCM today and restore the performance and dependability you expect.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is the main computer that controls your vehicle’s engine and transmission. It takes data from dozens of sensors to manage fuel injection, ignition timing, emissions systems, and automatic transmission shift points to ensure optimal performance, fuel efficiency, and low emissions.
Do I need to have this module programmed?
No. This PCM comes fully pre-programmed to your vehicle’s specific VIN before we ship it. This makes the installation process much simpler and saves you a trip to the dealership for expensive programming services.
Is any special procedure needed after I install it?
Yes, in most cases you will need to perform a security relearn procedure, also known as a Passlock or anti-theft relearn. It’s a simple process that you can do yourself in about 30 minutes with just the ignition key. Instructions are widely available online and are easy to follow.
How do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, it is crucial to have your vehicle properly diagnosed to confirm the PCM is the root cause, as other failing sensors or components can also trigger the light.
Is this part compatible with service number 12583826?
Yes, this module is a direct replacement and is fully compatible with vehicles that originally came with either service number 89017735 or 12583826.