Is Your Buick Rainier or GM SUV Running Rough?
If your 2004-2005 Buick Rainier, Chevy Trailblazer, or GMC Envoy is suffering from mysterious and frustrating issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition, the problem may lie with a failing Powertrain Control Module (PCM). The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shift points. When it begins to fail, it can cause a cascade of problems that are often difficult to diagnose.
Symptoms of a Faulty Powertrain Control Module
- ✔ Persistent Check Engine Light (CEL) with various engine or communication codes.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Rough or unstable idling.
- ✔ Harsh, delayed, or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or hesitation during acceleration.
- ✔ The vehicle cranks but refuses to start.
- ✔ Failure to pass state emissions testing.
The Direct-Fit, Programmed Solution: Your 2004-2005 Rainier PCM
Don’t let a faulty computer keep your reliable GM SUV off the road. This Powertrain Control Module is a direct-fit replacement for part number 12574976 and several other interchangeable numbers. The most significant benefit is our professional programming service. Before we ship the unit, we flash it with the latest official GM software updates, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures seamless communication with your vehicle’s other modules, eliminating the need for an expensive trip to the dealership for programming. You receive a component that is ready for installation right out of the box.
This module is a reliable and cost-effective way to restore your vehicle’s performance, efficiency, and dependability. It is compatible with a wide range of popular GM models equipped with the 4.2L inline-6 engine, including:
- 2004-2005 Buick Rainier
- 2003-2005 Chevrolet Trailblazer & Trailblazer EXT
- 2003-2005 GMC Envoy, Envoy XL, & Envoy XUV
- 2003-2005 Isuzu Ascender
- 2003-2004 Oldsmobile Bravada
- 2005-2006 Saab 9-7X
By providing us with your VIN upon purchase, you guarantee that the 2004-2005 Rainier PCM you receive is perfectly matched to your vehicle’s factory specifications, ensuring optimal engine and transmission operation from the moment it’s installed.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and we will flash the module with the latest GM software specific to your vehicle, making it ready to install.
What is a CASE Relearn and will I need to perform one?
A CASE (Crankshaft Angle Sensor Error) Relearn is a procedure that synchronizes the new PCM with your engine’s crankshaft position sensor. While not always necessary, some vehicles may require this simple procedure after installation to clear a specific trouble code (P1336). Most high-end scan tools can perform this in minutes.
Where can I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, the driver’s side door jamb sticker, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then this part will resolve the issue. However, it’s crucial to ensure a proper diagnosis has been performed, as other failing sensors or components can also trigger the light.
Is this part compatible with other part numbers?
Yes, this module is a direct replacement for several part numbers, including 12573576, 12577955, 12584593, 16255757, and 19210065, ensuring wide compatibility across various GM models.