Restore Peak Performance to Your 2006 Buick Rainier
Is your 2006 Buick Rainier suffering from perplexing engine problems like stalling, rough idling, or a persistent Check Engine Light? The Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the source of these frustrating issues. This replacement PCM, part number 12606373, is the definitive solution to restore your vehicle’s engine management system to its original factory specifications. It arrives at your door pre-programmed with the latest GM software updates, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures a seamless, plug-and-play installation without the need for an expensive trip to the dealership.
From the Diagnostic Bay
We had a 2006 Trailblazer (which uses the same PCM as the Rainier) come into the shop with a random misfire and intermittent stalling that the owner had been chasing for months. He had already replaced spark plugs, coils, and even a fuel pump. After hooking up our scanner, we noticed erratic data from the PCM. Before condemning the module, we checked the main ground connections on the engine block. Sure enough, one was loose and corroded. After cleaning and tightening it, the problem was solved. It’s a great reminder: always check your grounds and connections before replacing a major electronic component. A faulty module can cause these issues, but so can a simple bad connection.
Common Symptoms of a Failing 2006 Rainier PCM
A failing engine computer can manifest in numerous ways, affecting both performance and drivability. If you’re experiencing any of the following, it may be time to replace your PCM:
- ✔ Unexplained Check Engine Light (CEL) illumination, often with codes related to module communication or sensor circuits.
- ✔ Engine stalling, stumbling, or hesitation during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
A Simple, Reliable Solution Programmed for Your SUV
Don’t let a faulty computer keep your reliable GM SUV off the road. This module is a direct replacement for a wide range of vehicles equipped with the 4.2L inline-six engine and other compatible platforms. By providing us with your VIN during checkout, you guarantee that the module you receive is a perfect match, loaded with the correct software for your vehicle’s specific options and calibration. This critical step eliminates compatibility guesswork and ensures all related systems, from the engine and transmission to the emissions equipment, function in perfect harmony. This is not just a replacement part; it’s a restoration of your vehicle’s core operational logic.
This PCM is a direct fit for an extensive list of part numbers, including: 12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, and 19209821.
It is compatible with a variety of popular GM models, including:
- 2006 Buick Rainier (4.2L)
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2006 GMC Envoy & Envoy XL (4.2L)
- 2004-2006 Chevrolet Colorado
- 2004-2006 GMC Canyon
- 2006 Hummer H3
- 2006 Isuzu Ascender (4.2L)
- 2006 Isuzu I-280 & I-350
- 2006 Saab 9-7X (6 cylinder)
Frequently Asked Questions
What is a Powertrain Control Module (PCM)?
The PCM is the central computer in your vehicle that controls all aspects of the engine and transmission. It manages fuel injection, ignition timing, emissions systems, and transmission shift points to ensure optimal performance, fuel efficiency, and low emissions.
Is this part difficult to install?
For most of the listed vehicles, the PCM is located in an accessible spot in the engine bay (either on the LH side of the engine or the RH firewall). Installation typically involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. Since this unit comes pre-programmed, no special tools are required for software setup.
Do I need to do anything after installation?
In many cases, a security relearn procedure may be necessary for the vehicle to start. This is a simple process that typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Instructions for this procedure are widely available online for your specific model.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot ship your part until we receive this information, as it is essential for programming the module correctly for your vehicle.
Will this fix my Check Engine Light?
If the Check Engine Light is on due to an internal failure of your original PCM, then yes, this replacement part will resolve the issue. However, it’s always recommended to have the codes read with a diagnostic scanner to confirm the PCM is the root cause and not a faulty sensor or wiring problem.