Restore Your Vehicle’s Performance and Reliability
Are you battling persistent check engine lights, rough idling, or frustrating stalling in your 2004 GM truck or SUV? A failing Powertrain Control Module (PCM) is often the culprit behind these complex issues, leaving you with an unreliable vehicle. This replacement PCM, service number 12586242, is the definitive solution to restore your engine’s brain, getting you back on the road with confidence and peace of mind.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty PCM is the likely cause. This unit is designed to correct these exact problems:
- Erratic engine performance or misfires
- Poor fuel economy
- Transmission shifting problems
- Vehicle failing to start or stalling unexpectedly
- Illuminated Check Engine Light with codes like P0601, P0602, or P0606
Instead of paying for expensive diagnostics and dealership programming fees, this module arrives ready for installation. We take care of the complex part by programming the unit to your vehicle’s specific VIN, ensuring a seamless and effective repair. The 2004 Buick Rainier PCM 12586242 is your direct path to a smooth-running engine.
Features & Tangible Benefits
- ✔ VIN-Programmed for You: We flash the module with your vehicle’s VIN and the latest GM software updates before it ships. This eliminates the need for a trip to the dealer, saving you time and money.
- ✔ True Plug-and-Play Installation: Once you receive the computer, the installation is straightforward. In most cases, no complicated security relearn procedures are required.
- ✔ Guaranteed Compatibility: This PCM is a direct replacement for service numbers 12586242, 19299226, 89017738, and many others, ensuring a perfect fit for your 2004 Rainier, Envoy, Sierra, Silverado, and more.
- ✔ Restored Drivability: By installing a properly functioning and updated module, you’ll restore the precise fuel delivery, ignition timing, and transmission control your vehicle had when it was new.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Technician’s Insight
As a technician with over 20 years of experience, I’ve seen countless vehicle owners waste time and money on incorrect diagnoses when the PCM was the root cause. A common mistake is buying a used module from a salvage yard, only to find out that it cannot be reprogrammed or is also faulty. Our process ensures you get a fully tested and properly programmed computer from the start. This isn’t just a part; it’s a complete solution that saves you the headache of a trial-and-error repair. For a critical component like the 2004 Buick Rainier PCM 12586242, starting with a professionally programmed unit is the smartest investment in your vehicle’s longevity.
Frequently Asked Questions
What do I need to do after I purchase?
After you complete your purchase, you must send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship your module without it. You can typically add it as a note during checkout or send it to us in a message.
Is this part difficult to install?
For most of the listed vehicles, the PCM is located in the engine bay, either next to the airbox or under the battery. Installation typically involves disconnecting the battery, unplugging the electrical connectors, and unbolting the module. It is a task a confident DIYer can perform. However, we always recommend consulting a professional if you are unsure.
Will this fix my specific problem?
This 2004 Buick Rainier PCM 12586242 is designed to resolve issues directly caused by a failing engine computer. While it fixes a wide range of common symptoms, it’s essential to ensure your vehicle’s issues are not caused by other faulty components like sensors or wiring. Proper diagnosis is key to a successful repair.
How do I find my part number to confirm a match?
Your original PCM will have a sticker on it with the service number (SERV. NO.). You can match that number to our list, which includes 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, and many more, to confirm compatibility.
Does this module require any additional programming?
No. Because we program it to your VIN before shipping, it arrives ready for installation. In most cases, a security relearn procedure (often called a CASE relearn) is not necessary for the vehicle to start and run properly.