Restore Peak Performance to Your GM Truck or SUV
Is your 2006 Chevrolet Trailblazer, GMC Envoy, or other compatible GM vehicle suffering from perplexing issues like erratic shifting, poor fuel economy, a no-start condition, or an illuminated Check Engine Light? The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer responsible for managing your engine and transmission. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems. This replacement Powertrain Control Module, part number 12597777, is the definitive solution to restore your vehicle’s original performance, reliability, and drivability.
From the Diagnostic Bay
We had a 2006 Trailblazer with the 4.2L engine come into the shop with a complaint of harsh, unpredictable transmission shifts and a persistent Check Engine Light. The owner had already spent a small fortune at another shop, replacing sensors and even servicing the transmission, but the problem remained. After hooking up our diagnostic scanner, we noticed communication errors with the TCM (Transmission Control Module) data. Instead of jumping to a costly transmission replacement, we focused on the central command unit. We swapped in a correctly programmed PCM, and it was like driving a different vehicle. The shifts were smooth, the engine ran perfectly, and all communication codes vanished. It’s a classic case where the “brain” was the issue, not the mechanical components it controls.
Is Your Vehicle Showing Signs of a Failing PCM?
A faulty PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following symptoms, a failing computer could be the root cause. This replacement unit is designed to resolve these common issues:
- ✔ Unexplained Check Engine Light illumination with various trouble codes (DTCs).
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine cranks but refuses to start.
- ✔ A noticeable and sudden drop in fuel efficiency.
- ✔ Stalling, stumbling, or hesitation during acceleration.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
The Direct-Fit Solution for Your 2006 Trailblazer PCM
Don’t settle for a generic, one-size-fits-all module that requires expensive dealership programming. We take the guesswork and hassle out of the repair. When you order this module, we will flash it with the latest GM-certified software updates specifically for your vehicle. All you need to do is provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN) during checkout. Your new 2006 Trailblazer PCM will arrive at your doorstep, pre-programmed and ready for a straightforward, plug-and-play installation. No additional programming or trips to the dealer are required.
Guaranteed Compatibility and Fitment
This module is a direct replacement for a wide range of GM vehicles and part numbers, ensuring a perfect match for your system. Please verify that your vehicle and original part number are listed below for guaranteed compatibility.
This module replaces the following 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.
This part fits the following vehicles:
- 2006 Buick Rainier (4.2L)
- 2004-2006 Chevrolet Colorado
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2004-2006 GMC Canyon
- 2006 GMC Envoy & Envoy XL (4.2L)
- 2006 Hummer H3
- 2006 Isuzu Ascender (4.2L)
- 2006 Isuzu i-280
- 2006 Isuzu i-350
- 2006 Saab 9-7x (6-cylinder)
By purchasing this pre-programmed 2006 Trailblazer PCM, you are getting a reliable, cost-effective solution that will have your vehicle running like new again. Get back on the road with confidence.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it to you. It will arrive ready for installation with no additional programming required. This saves you time and the high cost of dealer programming.
What is the VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your vehicle. It contains critical information about your vehicle’s make, model, engine, transmission, and factory-installed options. We use this information to load the exact correct software and calibrations for your specific vehicle configuration.
Where is the PCM located on my 2006 Trailblazer?
On the 2006 Trailblazer, Envoy, Rainier, and Ascender with the 4.2L engine, the PCM is located in the engine compartment on the driver’s side (LH engine). For the Colorado, Canyon, and Hummer H3, it is typically located on the passenger’s side firewall (RH firewall).
Is any special procedure needed after installation?
In most cases, this is a plug-and-play installation. However, some GM vehicles of this era may require a security relearn procedure (also known as a CASE relearn or Passlock relearn) to allow the vehicle to start. This procedure can typically be done without special tools and involves a series of key cycles. Instructions are widely available online or in service manuals.
What if I order the wrong part?
We strongly encourage you to verify your vehicle’s fitment and original part number before ordering. Because these units are programmed to a specific VIN, they are not easily returned. If you are unsure, please contact our expert support team with your VIN, and we will be happy to confirm the correct part for you.