Restore Peak Performance to Your GM Vehicle
Is your 2006 Buick Rainier, Trailblazer, or Envoy suffering from perplexing issues like a persistent check engine light, erratic shifting, poor fuel economy, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that governs your vehicle’s engine and transmission. A faulty PCM can make your vehicle unreliable and frustrating to drive. This replacement PCM, part number 12569773, is the definitive solution to restore your vehicle’s original performance, reliability, and drivability.
The PCM is the brain of your vehicle’s operation. It processes data from dozens of sensors to precisely manage fuel injection, ignition timing, transmission shift points, and emissions systems. When it begins to fail, the symptoms can be widespread and often misdiagnosed, leading to costly and unnecessary repairs of other components. By replacing your old module with this professionally programmed unit, you are addressing the root cause of the problem, not just the symptoms.
Why Choose Our Programmed 2006 Rainier PCM?
We take the guesswork and complexity out of PCM replacement. Unlike a generic module from a parts store or a salvage yard unit that won’t work without expensive dealer programming, our PCM arrives at your door ready for installation. We use the Vehicle Identification Number (VIN) you provide at checkout to flash the module with the latest, most up-to-date software directly from GM. This ensures perfect compatibility and optimal performance for your specific vehicle configuration. This isn’t just a replacement; it’s a restoration of your vehicle’s factory-specified operational parameters.
From the Diagnostic Bay
We had a 2006 Trailblazer (same platform as the Rainier) come into the shop with an intermittent stalling problem that was driving the owner crazy. They had already replaced the fuel pump and crank sensor based on another shop’s advice, but the issue persisted. After hooking up our professional scan tool and monitoring live data, we noticed erratic voltage readings from the PCM’s 5-volt reference circuit, but only when the engine was hot. This pointed to an internal failure in the module. We installed one of our VIN-programmed PCMs, performed the quick security relearn, and the truck ran perfectly. It’s a classic case where chasing symptoms costs more than correctly diagnosing the root cause—the failing computer.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Vehicle refuses to start or has difficulty starting.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
Simple Installation Process
Replacing the PCM is a straightforward process for a DIY mechanic or any professional technician. The module is typically located in the engine bay (on the LH side for the Rainier/Trailblazer/Envoy 4.2L, and on the RH firewall for the Colorado/Canyon/H3). Simply disconnect the negative battery terminal, unplug the electrical connectors from the old PCM, unbolt it, and install the new one in its place. After reconnecting the battery, you may need to perform a simple security relearn procedure (often called a CASE relearn), which can typically be done without special tools. Instructions for this procedure are widely available online or in service manuals.
This module is a direct replacement for a wide range of part numbers, ensuring broad compatibility. By providing your VIN, you guarantee that the 2006 Rainier PCM you receive is the correct one for your truck or SUV.
Compatible Part Numbers:
12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821
Guaranteed Fitment For:
- ✔ 2006 Buick Rainier (4.2L)
- ✔ 2004-2006 Chevrolet Colorado
- ✔ 2004-2006 GMC Canyon
- ✔ 2006 Hummer H3
- ✔ 2006 Isuzu Ascender (4.2L)
- ✔ 2006 Saab 9-7x (6 cylinder)
Frequently Asked Questions
Is this PCM truly plug-and-play?
Yes, for the most part. Because we program it to your vehicle’s specific VIN, it will have the correct software to operate the engine and transmission. However, on most GM vehicles, you will need to perform a security relearn procedure so the PCM communicates with your vehicle’s anti-theft system. This procedure is simple and typically does not require special tools.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot program and ship your module until we receive this information.
Do I need to send my old computer back?
No core charge is required for this part. You do not need to return your old, faulty module to us.
What if my original part number is not on your list?
The part numbers listed are the most common, but there can be others. As long as your vehicle’s year, make, model, and engine match our fitment list, we can program the correct software for your vehicle using your VIN.
What does programming with the ‘newest updates’ mean?
GM often releases software updates (calibrations) to address common issues, improve transmission shifting, or enhance engine performance and efficiency. We ensure your replacement module is loaded with the very latest and most stable software version available for your specific VIN.