Restore Your Vehicle’s Performance and Reliability
Is your 2004 Buick Rainier, or another compatible GM truck or SUV, suffering from frustrating issues like a persistent check engine light, rough idling, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM). Don’t let a faulty computer keep you off the road. This replacement PCM is the definitive, hassle-free solution to restore your vehicle’s original performance and get you driving with confidence again.
Common Symptoms of a Failing PCM & Your Solution
A vehicle’s PCM is its brain, controlling everything from fuel mixture and ignition timing to transmission shifting. When it fails, the symptoms can be confusing and widespread. If you’re experiencing any of the following, this module is your answer:
- Unexplained Check Engine Light (CEL)
- Engine stalling or misfiring
- Harsh or erratic automatic transmission shifting
- Noticeable decrease in fuel efficiency
- Failure to pass emissions testing
- Communication errors with diagnostic scan tools
- Engine starting problems or complete no-start situations
This isn’t just a replacement part; it’s a complete solution. We professionally program this 2004 Buick Rainier 5.3L PCM to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures perfect communication between the computer and all of your vehicle’s systems, just like the original from the factory.
Features & Benefits
- ✔ Plug & Drive Installation: Arrives pre-programmed to your VIN. No expensive trip to the dealership for flashing is required.
- ✔ Updated GM Software: We flash the unit with the latest software updates from General Motors, ensuring optimal engine and transmission performance.
- ✔ Guaranteed Compatibility: By matching your VIN, we ensure this module is the perfect fit for your vehicle’s specific options and systems.
- ✔ Solves Common Drivability Issues: The most reliable way to correct persistent electronic and performance problems caused by a faulty original computer.
- ✔ Direct-Fit Replacement: Designed to replace OEM service numbers 12586242, 19299226, 89017738, and others listed in our fitment guide.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
A common mistake is installing a used computer from another vehicle without proper programming. A PCM is not a one-size-fits-all part. Your vehicle’s VIN is a unique identifier for its specific engine, transmission, emissions equipment, and electronic options. Our VIN-specific programming ensures the module we send is a perfect digital handshake for your truck or SUV, preventing compatibility conflicts that can cause more problems than they solve. We’re not just selling a part; we are delivering a precise, vehicle-specific solution that works right out of the box.
Frequently Asked Questions
Do I need to do any programming or flashing myself?
Absolutely not. The main benefit of our service is that this 2004 Buick Rainier 5.3L PCM arrives at your door fully programmed to your vehicle’s VIN and ready for installation. This saves you the time, cost, and hassle of a dealership visit.
What information do you need from me after I order?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. We cannot program and ship the module without it. You can typically find your VIN on your 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.
How can I be sure this is the right part for my vehicle?
This module replaces service number 12586242 and many others. Please check the comprehensive fitment list on this page. The best way to be 100% certain is to find the service number on your current computer and ensure it matches one of the numbers listed. If you’re unsure, please contact us with your VIN before ordering.
What is a security or CASE relearn procedure?
On many GM vehicles, a simple security relearn procedure is required after installing a new PCM to sync it with your vehicle’s anti-theft system. This can typically be done without special tools and involves a sequence of key turns. A Crankshaft Variation (CASE) relearn may also be needed, which is best performed with a capable scan tool. Instructions for these procedures are widely available online for your specific model.
Is this a brand new computer?
This is a professionally inspected and verified genuine OEM component that has been programmed with the latest software for your vehicle. It provides the same reliability and function as a dealer-sourced part, ensuring a perfect fit and long-term performance for your 2004 Buick Rainier 5.3L PCM replacement.