Restore Peak Performance to Your GM Truck
Is your 2004-2006 Chevrolet Colorado, GMC Canyon, or Hummer H3 suffering from frustrating issues like a persistent check engine light, poor fuel economy, or erratic shifting? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. A faulty PCM can disrupt everything from ignition timing to fuel delivery, leading to a cascade of problems that can be difficult to diagnose. This replacement PCM, part number 12606373, is the definitive solution to get your truck back on the road and running like new.
The Brain of Your Vehicle’s Operation
The PCM is arguably the most critical component in your modern vehicle. It constantly processes data from dozens of sensors throughout the engine and transmission to make real-time adjustments. It controls the fuel injectors, spark plugs, and transmission solenoids to ensure optimal power, efficiency, and low emissions. When this vital computer begins to fail, the symptoms can be widespread and confusing, often mimicking other part failures. Replacing a faulty PCM is not just a repair; it’s a restoration of your vehicle’s core operational integrity.
From the Diagnostic Bay
We had a 2005 GMC Canyon come into the shop with a complaint of a harsh 1-2 shift and intermittent stalling at stoplights. The owner had already replaced the throttle body and a couple of transmission solenoids with no luck. After hooking up our diagnostic scanner, we noticed that the PCM was commanding erratic line pressure in the transmission and the fuel trim values were all over the place. Instead of continuing to chase ghosts, we identified the PCM as the root cause. A replacement, VIN-programmed module like this one solved all the issues in one go, saving the customer from further unnecessary and expensive part replacements.
Symptoms of a Failing 2004-2006 Colorado PCM
- ✔ Check Engine Light: The most common symptom, often with codes related to sensors, emissions, or internal processor errors.
- ✔ No-Start or Hard Starting: The engine may crank but fail to start, or take an unusually long time to fire up.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, and rough idling.
- ✔ Reduced Fuel Economy: A failing PCM can’t efficiently manage the fuel-to-air ratio, causing your truck to consume more gasoline.
- ✔ Erratic Transmission Shifting: You might experience harsh shifts, delayed engagement, or the transmission getting stuck in one gear (limp mode).
- ✔ Failed Emissions Test: Incorrect engine management will almost certainly lead to a failure at the emissions station.
Plug-and-Play Solution with VIN Programming
Don’t waste time and money with a trip to the dealership for expensive programming. We take the hassle out of the process. When you purchase this module, you simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the unit with the latest, most up-to-date GM factory software specific to your truck’s configuration. This ensures perfect compatibility and function right out of the box. While the module is ready to go, most GM vehicles of this era will require a simple security relearn procedure after installation, which can be done in your driveway without any special tools.
Wide Compatibility Across the GM Lineup:
This PCM is a direct replacement for a wide range of GM trucks and SUVs. It is compatible with the following models and part numbers:
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
Vehicle Fitment:
- 2004-2006 Chevrolet Colorado
- 2004-2006 GMC Canyon
- 2006 Hummer H3
- 2006 Buick Rainier (4.2L)
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L)
- 2006 GMC Envoy & Envoy XL (4.2L)
- 2006 Isuzu Ascender (4.2L)
- 2006 Isuzu i-280
- 2006 Isuzu i-350
- 2006 Saab 9-7x (6 cylinder)
Frequently Asked Questions
Do I need to get this PCM programmed?
No. We handle all the programming for you before we ship the part. Simply provide your vehicle’s VIN at checkout, and the module will arrive with the correct GM software for your specific truck.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your truck. It contains information about the engine, transmission, and other options. We use the VIN to load the exact software your vehicle needs to run correctly.
Is this part difficult to install?
The physical installation is straightforward for anyone with basic mechanical skills. It’s a direct-fit replacement. After installation, you will need to perform a security relearn procedure, which typically takes about 30 minutes and does not require special tools. Instructions are widely available online.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, if the light is on due to another failing component (like an oxygen sensor or catalytic converter), you will still need to address that separate issue.
What is the difference between a PCM, ECM, and ECU?
The terms are often used interchangeably. ECM (Engine Control Module) typically just controls the engine. PCM (Powertrain Control Module) controls both the engine and the transmission. ECU (Electronic Control Unit) is a more generic term for any computer in a vehicle. For this application, PCM is the most accurate term.