Is your 2006 Chevrolet Trailblazer EXT running rough, stalling, or refusing to start? Are you battling persistent check engine lights that just won’t go away? These are classic symptoms of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. This replacement PCM, part number 19209820, is the definitive solution to restore your truck’s performance, reliability, and fuel efficiency. It arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN), ensuring a seamless plug-and-play installation process.
From the Diagnostic Bay
We had a 2006 Envoy with the 4.2L engine come into the shop with a bizarre issue. The owner complained of random stalling at stoplights and a transmission that felt like it was shifting erratically. He had already replaced the throttle body and a few sensors with no luck. We hooked up our diagnostic scanner and saw some strange data readings from the PCM. Instead of immediately condemning the module, we checked the main power and ground connections at the PCM connectors. Sure enough, one of the main ground pins had high resistance due to corrosion. After cleaning the pin and connector, the truck ran perfectly. This is a great reminder: always verify the simple things like power, ground, and connections before replacing an expensive module. A faulty PCM can cause these issues, but so can a bad connection to it.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light (CEL) is illuminated with various trouble codes.
- ✔ Engine cranks but fails to start.
- ✔ Rough or unstable idling.
- ✔ Unexplained stalling or hesitation during acceleration.
- ✔ Poor fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Importance of a Programmed 2006 Trailblazer EXT PCM
The PCM in your Trailblazer is more than just a simple computer; it’s the central command center for your entire powertrain. It precisely controls fuel injection, ignition timing, transmission shift points, and emissions systems based on data from dozens of sensors. When it fails, the entire system is compromised. Our service eliminates the guesswork and costly trips to the dealership. We take your VIN and flash this module with the latest, most stable software updates directly from GM. This ensures that your 2006 Trailblazer EXT PCM is perfectly matched to your vehicle’s specific configuration, including its engine, transmission, and factory options. This VIN-specific programming is critical for proper function and is included with your purchase.
Direct-Fit Replacement and Compatibility
This module is a direct replacement for a wide range of GM trucks and SUVs from the mid-2000s, primarily those equipped with the robust 4.2L inline-six engine. It is engineered to meet or exceed original equipment specifications for a perfect fit and reliable operation. This unit is compatible with the following original 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 is guaranteed to fit the following vehicles:
- 2006 Buick Rainier (4.2L)
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2004-2006 Chevrolet Colorado
- 2006 GMC Envoy & Envoy XL (4.2L)
- 2004-2006 GMC Canyon
- 2006 Hummer H3
- 2006 Isuzu Ascender (4.2L)
- 2006 Isuzu i-280 & i-350
- 2006 Saab 9-7x (6-cylinder)
Don’t let a faulty computer keep your reliable Trailblazer off the road. This pre-programmed 2006 Trailblazer EXT PCM is the most effective and straightforward way to solve complex electronic issues and restore your vehicle to its peak operating condition. Simply provide your VIN at checkout, and we’ll handle the rest.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
In most cases, this is a plug-and-play solution. However, some GM vehicles of this era may require a security relearn procedure (often called Passlock) or a Crankshaft Variation Relearn (CASE relearn) to be performed with a capable scan tool for optimal performance and to clear certain codes.
Is this a new or used part?
This is a high-quality, tested replacement part that has been meticulously inspected and prepared to ensure it meets strict performance standards. It is programmed with the latest GM software for your specific vehicle.
Where is the PCM located on my 2006 Trailblazer?
On the 2006 Trailblazer and other GMT360 platform vehicles (Envoy, Rainier, etc.) with the 4.2L engine, the PCM is typically located on the driver’s side of the engine block, below the intake manifold.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot program and ship your module until we receive this information.
Will this fix my specific problem?
While this PCM will correct issues caused by a faulty module, it’s crucial to ensure your vehicle has been properly diagnosed. A bad sensor, wiring issue, or mechanical problem can sometimes mimic the symptoms of a failed PCM.