Is Your Buick LeSabre Running Rough? Get a Reliable Solution.
If you’re dealing with a frustrating check engine light, poor fuel economy, stalling, or erratic engine behavior in your 2003 Buick LeSabre, a failing Powertrain Control Module (PCM) is a very likely culprit. As the central computer for your engine and transmission, its proper function is critical. This isn’t just a replacement part; it’s a direct-fit, plug-and-play solution that restores your vehicle’s performance and reliability, programmed specifically for your car.
Expert Pro Tip: Check This Before You Buy
Over my 20+ years in the shop, I’ve seen countless PCMs replaced unnecessarily. Before you order, take 10 minutes to inspect the main ground strap from the engine block to the chassis. On these GM W-body and H-body platforms, that ground can become corroded or loose, causing all sorts of bizarre electrical issues that mimic a bad PCM. A simple cleaning with a wire brush can sometimes solve the problem. If your ground is solid, you can be much more confident the PCM is the issue.
Why is VIN Programming So Important?
A PCM from a junkyard or a generic parts store won’t work correctly. It needs to be coded with your vehicle’s specific Vehicle Identification Number (VIN). This process ensures all the unique parameters for your LeSabre—like the transmission type, gear ratios, and emissions equipment—are correctly loaded. Our process handles this for you, saving you a costly trip to the dealership for programming. We flash the module with the latest GM-certified software updates, which can often correct factory drivability issues you may not have even known about.
This Programmed PCM Solves Common Symptoms:
- âś” Persistent Check Engine Light (CEL)
- âś” Engine stalling or hesitation
- âś” Poor or inconsistent shifting
- âś” Reduced fuel mileage
- âś” No-start conditions where the engine cranks but won’t fire
- âś” Communication error codes with a scan tool
Guaranteed Fitment for Your 2003 LeSabre Powertrain Control Module
This module, part number 89017735 (interchangeable with service number 12583826), is a guaranteed fit for a range of GM vehicles. After purchase, simply provide us with your VIN, and we’ll handle the rest. It’s a direct replacement for the original electronic control module located in the left-hand (driver’s side) engine compartment, typically inside the air filter box assembly.
Compatible Vehicles:
- 2003 Buick LeSabre (with ID 12583826)
- 2003-2004 Buick Regal
- 2003-2004 Buick Park Avenue (with ID 12583826 for ’04)
- 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)
Plug-and-Play Installation: No Dealer Visit Required
Installing your new PCM is straightforward. Since we program it beforehand, you won’t need any special tools or a trip to the dealer. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your car’s battery and wait 10-15 minutes for the system capacitors to discharge.
- Locate the PCM: On your LeSabre, the PCM is located inside the air filter housing on the driver’s side of the engine bay.
- Access the Module: Unclip the top of the air filter housing and remove the air filter to gain access to the PCM.
- Disconnect Connectors: Carefully unlatch and remove the electrical connectors from the old PCM. Inspect the pins for any corrosion or damage.
- Swap the Module: Remove the old PCM from its mounting bracket and install the new one in its place.
- Reconnect and Reassemble: Securely plug the electrical connectors into your new PCM. Reinstall the air filter and clip the housing lid back on.
- Final Step: Reconnect the negative battery terminal. The vehicle may need to complete a CASE Relearn procedure, which typically happens automatically during the first few drive cycles.