Is Your Trailblazer Running Rough? It Could Be The PCM.
If you’re experiencing frustrating and unpredictable issues with your 2006 Chevrolet Trailblazer EXT or another compatible GM vehicle, the root cause might be the very brain of your engine: the Powertrain Control Module (PCM). This vital component is responsible for managing everything from fuel mixture and ignition timing to transmission shifting and emissions control. When it begins to fail, it can create a cascade of problems that are often difficult to diagnose, leading to wasted time and money on unnecessary repairs.
This replacement Powertrain Control Module, corresponding to part number 12569773 and its alternatives, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency. We take the guesswork out of the repair by pre-programming the module specifically for your vehicle using the VIN you provide. This means it arrives at your door ready for installation, loaded with the latest factory software updates from GM to ensure optimal operation.
From the Diagnostic Bay
We once had a 2006 GMC Envoy with the 4.2L engine come into the shop with an intermittent stalling problem and a persistent P0300 (Random Misfire) code. The owner had already replaced all the spark plugs, ignition coils, and even the camshaft position sensor, but the issue remained. After hooking up our diagnostic scanner and monitoring live data, we noticed erratic readings from the PCM’s injector and ignition coil drivers. Instead of continuing to chase ghosts, we installed a VIN-programmed PCM. The engine immediately smoothed out, the code was cleared, and it never returned. It’s a classic case of symptoms pointing to multiple parts, but the conductor of the orchestra—the PCM—was the real culprit.
Common Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light: The most common indicator, often with codes related to sensors, emissions, or internal module faults.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, and rough idling.
- ✔ Reduced Fuel Economy: The engine may run too rich or too lean, causing your vehicle to consume more fuel than usual.
- ✔ Erratic Transmission Shifting: The PCM also controls transmission functions, so a failure can lead to harsh shifts, delayed engagement, or getting stuck in one gear.
- ✔ Engine Stalling: The engine may stall unexpectedly while driving or when coming to a stop.
- ✔ No-Start Condition: In severe cases, a complete PCM failure can prevent the engine from starting at all, even if the battery and starter are good.
- ✔ Communication Errors: Your mechanic’s scan tool may be unable to communicate with the vehicle’s computer system.
Why Choose Our 2006 Trailblazer EXT PCM Solution?
Getting your truck back on the road shouldn’t be a complicated ordeal. Our process is designed to be as straightforward as possible. This isn’t just a generic, off-the-shelf part. It’s a component specifically prepared for your vehicle’s unique identity. By programming the module with your VIN, we ensure that all factory-installed options and operating parameters are correctly configured. This direct-fit 2006 Trailblazer EXT PCM eliminates the need for expensive trips to the dealership for programming. After installation, a simple security relearn procedure (which you can often do yourself) is typically all that’s needed to sync the new module with your vehicle’s anti-theft system.
Guaranteed Compatibility
This module is a direct replacement for a wide range of part numbers, ensuring broad compatibility across several GM models. If your original module has any of the following part numbers, this unit will work for you:
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 confirmed to fit the following vehicles:
- 2004-2006 Chevrolet Colorado
- 2004-2006 GMC Canyon
- 2006 Buick Rainier (4.2L)
- 2006 Hummer H3
- 2006 Isuzu Ascender (4.2L)
- 2006 Isuzu i-280 & i-350
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2006 GMC Envoy & Envoy XL (4.2L)
- 2006 Saab 9-7x (6 cylinder)
Don’t let a faulty computer keep your reliable GM truck or SUV sidelined. Order this pre-programmed 2006 Trailblazer EXT PCM today and restore the dependable performance you count on.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM), also known as the Engine Control Module (ECM), is your vehicle’s main computer. It controls all aspects of engine and transmission operation to ensure optimal performance, fuel efficiency, and emissions.
Do I need to program this module?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number) during or after checkout, and we will flash the module with the latest GM software specific to your vehicle.
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 typically located on the driver’s side of the engine block, below the intake manifold. On models like the Colorado, Canyon, and H3, it’s usually found on the right-hand (passenger side) firewall.
What is a VIN and why do you need it?
The VIN is your vehicle’s unique 17-digit serial number, found on your dashboard (visible through the windshield) and on your registration/insurance documents. We use it to access the exact factory calibration file for your vehicle’s specific engine, transmission, and options, ensuring a perfect match.
Will this fix my check engine light?
If the check engine light is on due to an internal failure of the PCM itself, then yes, this replacement module should resolve the issue. However, if the light is caused by a faulty sensor or another component, that part will still need to be repaired.
Is any additional setup required after installation?
After installation, you will likely need to perform a security relearn procedure, also known as the Passlock relearn. This syncs the new PCM to your vehicle’s anti-theft system and allows the engine to start. This procedure can typically be done without special tools and instructions are widely available online. In some cases, a Crankshaft Variation Relearn (CASE Relearn) may be needed with a scan tool to clear a P1336 code, but the vehicle will run and drive without it.