Is Your GM Vehicle Running Rough, Stalling, or Showing a Check Engine Light?
A failing Powertrain Control Module (PCM) can be the source of countless frustrating and hard-to-diagnose issues. If you’re experiencing erratic engine behavior, poor fuel economy, or a persistent check engine light in your Buick, Chevrolet, or Pontiac, you’ve found the reliable, long-term solution. This isn’t just a replacement part; it’s a direct path to restoring your vehicle’s original performance and dependability. We professionally program this module to your vehicle’s specific VIN, ensuring it works correctly right out of the box.
Common Symptoms & Your Solution
A faulty PCM can manifest in various ways, often mimicking other sensor or component failures. If you’ve been chasing problems without success, your engine computer may be the culprit. This pre-programmed module is the definitive fix for:
- Unexpected stalling or cutting out while driving
- Harsh or erratic automatic transmission shifting
- Complete no-start condition where the engine cranks but won’t fire
- Noticeable decrease in fuel efficiency
- Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0603, P0605, or P0606
- Failure to pass state emissions testing
By installing our expertly programmed 2003-2004 Buick Regal PCM, you are directly addressing the root cause of these issues and giving your vehicle the stable, reliable brain it needs to operate as the factory intended.
Features & Benefits
- âś” VIN-Programmed for Your Vehicle: We flash the module with the latest GM-certified software using your unique VIN. This ensures perfect compatibility and function with your car’s specific options and systems.
- âś” Restored Engine Performance: Eliminate rough idling, hesitation, and poor acceleration. Enjoy the smooth, responsive driving experience you’ve been missing.
- âś” Plug-and-Play Installation: Because the unit arrives programmed, installation is straightforward. In most cases, no complicated dealer-only tools are required for the initial setup.
- âś” Cost-Effective Repair: Avoid the high costs and lengthy wait times associated with dealership repairs. This is a practical solution that gets you back on the road quickly and affordably.
- âś” One-Year Warranty: This unit is backed by our one-year replacement warranty for your complete peace of mind.
Expert Insight: The Critical Role of VIN Programming
On these specific GM vehicles from the early 2000s, the PCM is the central hub for the entire vehicle’s electronics. It doesn’t just control the engine and transmission; it’s also deeply integrated with the anti-theft system (VATS/Passlock). Simply installing a used, non-programmed module will result in a no-start condition because the security credentials won’t match. Our VIN programming service handles this critical step for you. We ensure the PCM recognizes your keys and communicates seamlessly with the Body Control Module (BCM) and other onboard systems, making the replacement process as smooth as possible.
Don’t let a faulty computer keep your reliable car off the road. This programmed 2003-2004 Buick Regal PCM is the most dependable way to solve complex electronic issues and restore your confidence in your vehicle. Please provide your VIN at checkout so we can begin the programming process and get your part shipped out promptly. This module is the correct fit for vehicles requiring service part numbers 89017735 or 12583826.
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or requirement to send your original module to us. This is an outright purchase, saving you time and return shipping costs.
Is this really ‘plug and play’?
Yes, for most vehicles. Because we program the PCM to your VIN, it’s ready for installation. However, some vehicles may require a simple security relearn procedure after installation, which can be done without special tools and typically takes 10-30 minutes. We include instructions for this common procedure.
Where do I provide my VIN?
You can add your 17-digit Vehicle Identification Number (VIN) in the notes section during checkout. You can also send it to us via email after placing your order. We cannot ship your part until we receive the VIN.
Will this fix my specific problem?
This 2003-2004 Buick Regal PCM is a direct solution for issues caused by a failing engine computer, including common DTCs like P0601. While it solves a wide range of problems, we always recommend proper vehicle diagnostics to confirm the PCM is the point of failure before ordering.
What if my part number isn’t listed?
This module replaces service numbers 12583826 and 89017735. If your number is different, please contact us with your VIN and original part number. We can verify compatibility to ensure you receive the correct part for your vehicle.