Is Your 2006 Trailblazer Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module, or PCM, is the central command center of your 2006 Chevrolet Trailblazer. It meticulously manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When this critical component begins to fail, it can cause a cascade of confusing and frustrating problems that can be difficult to diagnose. You might experience unexplained stalling, poor fuel economy, a lit-up check engine light, or even a complete no-start condition. Don’t let a faulty computer keep your reliable SUV off the road. This direct-replacement PCM is the solution to restore your vehicle’s original performance and reliability.
From the Diagnostic Bay
We had a 2006 GMC Envoy come in that was giving the owner fits. The vehicle would randomly stall at stoplights and had a persistent P0601 (Internal Control Module Memory Check Sum Error) code that wouldn’t clear. The owner had already replaced the spark plugs, ignition coils, and even the fuel pump with no success. After hooking up our diagnostic scanner and monitoring live data, we noticed erratic signals from several sensors that all routed back to the PCM. The internal processor was failing. We installed a VIN-programmed PCM just like this one, performed the security relearn, and the Envoy ran perfectly. It’s a classic example of how a failing PCM can mimic other component failures, making a direct-fit, correctly programmed module the only true fix.
Symptoms of a Failing 2006 Trailblazer PCM
If you’re experiencing any of the following issues, a faulty powertrain control module could be the root cause. A failing PCM often presents a variety of symptoms that can seem unrelated, making diagnosis a challenge for even seasoned mechanics. Pay close attention if your vehicle shows these signs:
- ✔ Check Engine Light is illuminated with communication-related error codes (U-codes) or internal processor fault codes (P06xx codes).
- ✔ Your vehicle fails to start or starts intermittently for no apparent reason.
- ✔ Noticeable decrease in fuel efficiency and overall engine performance.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, sputtering, or misfiring while driving or at idle.
- ✔ Cooling fans not turning on, leading to overheating, or staying on constantly, draining the battery.
- ✔ Inconsistent or non-functional electronic throttle control.
The Plug-and-Play Solution for Your GM Truck or SUV
This isn’t just a replacement part; it’s a comprehensive solution. We take the guesswork and hassle out of the repair process. When you order this module, we will flash it with the latest, most stable software updates directly from GM, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This critical step ensures that the module communicates flawlessly with all other systems in your vehicle, from the anti-lock brakes to the instrument cluster. It arrives at your door ready for installation, eliminating the need for an expensive trip to the dealership for programming.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles, including the 2006 Chevrolet Trailblazer with the 4.2L engine. It is compatible with numerous original equipment part numbers, ensuring a perfect fit and function. Please verify your part number against the list below or contact us with your VIN to confirm compatibility.
This part will fit these makes and models with these options:
- CHEVROLET COLORADO 2004-2006
- GMC CANYON 2004-2006
- BUICK RAINIER 2006 (4.2L)
- HUMMER H3 2006
- ISUZU ASCENDER 2006 (4.2L)
- ISUZU I-280 & I-350 2006
- CHEVROLET TRAILBLAZER & TRAILBLAZER EXT 2006 (4.2L)
- GMC ENVOY & ENVOY XL 2006 (4.2L)
- SAAB 9-7X 2006 (6 cylinder)
Replaces 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
Frequently Asked Questions
Do I need to get this PCM programmed?
No. We handle the programming for you before we ship the part. You just need to provide us with your vehicle’s VIN during or after checkout. It will arrive ready to be installed.
Where is the PCM located on a 2006 Trailblazer?
On the 2006 Trailblazer and other GMT360 platform vehicles (like the Envoy and Rainier) with the 4.2L engine, the PCM is located on the driver’s side of the engine block, below the intake manifold.
What is a security relearn or CASE relearn?
After installation, your vehicle may require a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This is a simple procedure that typically involves cycling the ignition key and can be done without special tools. A Crankshaft Variation Relearn (CASE) may also be needed to prevent a P1336 trouble code, which requires a capable scan tool.
Is this a difficult part to replace?
For someone with moderate mechanical skill, this is a straightforward replacement. It involves disconnecting the battery, unplugging the electrical connectors, and unbolting the module from its bracket. The most important part is ensuring the connectors are clean and seat properly upon reinstallation.
How do I provide my VIN?
You can add your VIN in the notes section during checkout, or you can send it to us in a message after you’ve completed your purchase. We cannot ship your part until we have this information.