Is your 2004-2006 Chevrolet Colorado or GMC Canyon running rough, shifting erratically, or refusing to start? Are you staring at a persistent Check Engine Light with confusing error codes? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your truck’s engine and transmission. A faulty PCM can lead to frustrating drivability issues, poor fuel economy, and even a complete no-start condition, leaving you stranded. Don’t let a bad module compromise your vehicle’s reliability. This direct replacement PCM, part number 12596784, is the definitive solution to restore your truck’s performance and get you back on the road with confidence.
This isn’t just a generic part off the shelf. We provide a comprehensive service that makes this a simple, plug-and-play solution. Upon purchase, you will provide us with your vehicle’s Vehicle Identification Number (VIN). Our technicians will then program the module with the latest, most stable software updates directly from GM. This VIN-specific flashing ensures that the PCM is perfectly calibrated to your truck’s unique configuration, including its engine, transmission, and factory options. This critical step eliminates the need for an expensive trip to the dealership for programming, saving you both time and money.
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 transmission fluid, filter, and two shift solenoids, with no improvement. The codes were intermittent and pointed towards a transmission communication error. After confirming the wiring harness was intact, we focused on the PCM. A failing driver inside the module was intermittently losing communication with the transmission control portion of the board. We installed one of our VIN-programmed PCMs, performed a quick security relearn, and the truck drove like it just rolled off the assembly line. It’s a perfect example of how chasing symptoms can be costly, while addressing the root cause—the vehicle’s central computer—provides a lasting fix.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) illumination
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Complete no-start or intermittent starting condition
- ✔ Drastic decrease in fuel economy
- ✔ Communication error codes with a scan tool (e.g., U-codes)
- ✔ Failure to pass emissions testing
- ✔ Other warning lights on the instrument cluster may appear
Why Choose Our 2004-2006 Colorado PCM?
Choosing the right replacement module is critical for the longevity and performance of your vehicle. Our process is designed to provide a reliable and straightforward solution. Each module undergoes a thorough inspection to ensure the hardware is sound. The key to our service is the professional programming. By flashing the module with your VIN, we ensure all operational parameters are set to factory specifications. This means the engine’s fuel maps, ignition timing, transmission shift points, and idle speed control are all correctly calibrated for your specific truck. This attention to detail is what separates a simple part from a true vehicle solution. This 2004-2006 Colorado PCM is ready for installation right out of the box, getting you back on the road faster.
Installation and Setup
The PCM on the 2004-2006 Colorado and Canyon is typically located on the right-hand (passenger side) of the firewall in the engine bay. Installation is straightforward for anyone with basic mechanical skills. After disconnecting the battery, you simply unplug the electrical connectors, unbolt the old module, and install the new one. Once the new module is installed and the battery is reconnected, you may need to perform a simple security relearn procedure, also known as a Passlock or VATS relearn. This procedure can usually be done without any special tools and involves a series of key cycles. Instructions are widely available online or in service manuals. This final step syncs the new PCM with your vehicle’s anti-theft system, allowing the engine to start and run.
Guaranteed Fitment
This module is a direct replacement for a wide range of GM trucks and SUVs. Please verify your part number and vehicle model against the list below to ensure compatibility. This unit 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.
- Chevrolet Colorado: 2004-2006 (RH firewall)
- GMC Canyon: 2004-2006 (RH firewall)
- Hummer H3: 2006 (RH firewall)
- Buick Rainier: 2006 (4.2L, LH engine)
- Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L, LH engine)
- GMC Envoy & Envoy XL: 2006 (4.2L, LH engine)
- Isuzu Ascender: 2006 (4.2L, LH engine)
- Isuzu I-280 & I-350: 2006 (RH firewall)
- Saab 9-7x: 2006 (6 cylinder, LH engine)
Frequently Asked Questions
Do I need to have this module programmed?
No. This module comes pre-programmed to your vehicle’s specific VIN. Simply provide your VIN at checkout, and we handle all the flashing and software updates before shipping it to you.
Where is the PCM located on my 2004-2006 Colorado?
On the 2004-2006 Chevrolet Colorado and GMC Canyon, the PCM is located in the engine compartment, mounted to the right-hand (passenger side) of the firewall.
What is a security relearn procedure?
A security relearn, or VATS relearn, is a simple procedure that syncs the new PCM to your vehicle’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle two more times. This allows the new computer to recognize your key and permit the engine to start.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls all electronic functions of the transmission, including shift points and line pressure. If your transmission issues are caused by a faulty module, this replacement 2004-2006 Colorado PCM is the correct solution.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for the module to function in your truck.