Is your 2006 Buick Rainier or other GM SUV suffering from perplexing issues like a persistent check engine light, erratic shifting, stalling, or a no-start condition? The problem often lies with the very brain of your vehicle’s engine and transmission: the Powertrain Control Module (PCM). This isn’t just another part; it’s the central command unit responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it fails, the symptoms can be widespread and confusing, often leading to incorrect diagnoses and costly, unnecessary repairs.
We offer a direct, reliable solution. This is a genuine replacement PCM, part number 12606374, meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical programming step ensures that the module communicates flawlessly with all other systems in your vehicle, just as the original did. We load it with the latest GM-certified software updates, which can resolve factory-known bugs and improve overall performance and efficiency. Stop chasing ghosts in the machine and restore your vehicle’s reliability with a component that’s ready to install right out of the box.
From the Diagnostic Bay
We had a 2006 Trailblazer (which uses the same platform as the Rainier) come into the shop with a classic complaint: intermittent stalling at red lights and a check engine light for a throttle position sensor (TPS) code. The owner had already replaced the TPS twice, and the problem kept returning. After hooking up our scanner and monitoring live data, we noticed the 5-volt reference signal to the sensor was dropping out randomly. Instead of a faulty sensor, the PCM itself was failing, unable to provide a stable voltage. We installed a VIN-programmed PCM, performed the security relearn, and the truck ran perfectly. It’s a textbook example of how a failing module can send you on a wild goose chase, making other perfectly good parts look like the culprit.
Is Your 2006 Rainier Powertrain Control Module Failing?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your vehicle’s main computer needs attention. Ignoring these signs can lead to further component damage, poor fuel economy, and unsafe driving conditions.
- ✔ Persistent Check Engine Light (CEL) that won’t clear, or comes back after a reset.
- ✔ Unexplained engine stalling, stumbling, or rough idling.
- ✔ Harsh, delayed, or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel efficiency.
- ✔ The engine cranks but refuses to start (intermittent or complete no-start).
- ✔ Communication error codes (U-codes) when scanned with a diagnostic tool.
- ✔ Failure to pass state emissions testing.
A Programmed, Ready-to-Install Solution
The key to a successful repair is receiving a module that is correctly configured for your exact vehicle. Generic, unprogrammed modules from a parts store or salvage yard simply will not work. Our process is simple and effective: upon purchase, you provide us with your vehicle’s VIN. Our technicians then use this information to flash the module with the precise software and calibrations for your 2006 Buick Rainier’s engine, transmission, and options package. This ensures a seamless integration, restoring factory performance and functionality. This module is a direct replacement for a wide range of part numbers, including 12569773, 12588650, 12591647, 12597521, 12606374, and many more.
This PCM is compatible with a variety of GM trucks and SUVs, 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)
Please verify your part number or contact us with your VIN to confirm compatibility before ordering.
Frequently Asked Questions
Why is my VIN required for this part?
Your Vehicle Identification Number (VIN) contains critical information about your vehicle’s specific build, including engine type, transmission, and emissions systems. We use the VIN to load the exact GM-approved software and calibrations onto the PCM, ensuring it functions perfectly with your vehicle. An unprogrammed module will not work.
Is this part difficult to install?
The physical installation is straightforward for someone with basic mechanical skills. On the 2006 Rainier, it’s located in the engine bay on the driver’s side. After swapping the module, a ‘Security Relearn’ or ‘CASE Relearn’ procedure is typically required, which can often be done without special tools. We recommend consulting a service manual for the specific steps for your vehicle.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this will resolve the issue. However, it’s crucial to properly diagnose the problem first. This module will not fix issues caused by other failed components like sensors or wiring problems.
What is a ‘CASE Relearn’ and do I need to do it?
CASE stands for Crankshaft Angle Sensor Error. The relearn procedure synchronizes the new PCM with your engine’s crankshaft position sensor. If not performed, you may have a check engine light with code P0315. Many vehicles can initiate this procedure without a scan tool, but some may require a trip to a mechanic with the proper equipment.
Is this a new or used part?
This is a high-quality, serviced original equipment part. Each unit undergoes a thorough inspection and testing process to ensure it meets or exceeds OEM specifications. We then program it with the latest software for your vehicle.