Restore Peak Performance to Your GM Truck or SUV
Is your 2004-2006 Chevrolet Colorado, GMC Canyon, or another compatible GM vehicle suffering from perplexing electrical issues? A faulty Powertrain Control Module (PCM) is often the culprit behind a wide range of performance problems, from a persistent Check Engine Light to poor fuel economy and even a no-start condition. This vital component is the brain of your vehicle’s engine, controlling everything from fuel mixture and ignition timing to transmission shifting and emissions. When it fails, the symptoms can be frustrating and difficult to diagnose. This replacement PCM, part number 12604439, is the definitive solution to get your vehicle running reliably again.
From the Diagnostic Bay
We had a 2005 GMC Canyon come into the shop with a complaint of intermittent stalling and a laundry list of seemingly unrelated trouble codes. The owner had already replaced the throttle body and a few sensors with no luck. After checking the wiring diagrams, we focused on the main power and ground circuits for the PCM. We found a corroded ground connection on the engine block, barely making contact. While cleaning the ground fixed the immediate issue, the intermittent voltage spikes from the bad connection had already damaged the internal circuits of the original PCM. We installed a VIN-programmed module like this one, performed the security relearn, and the truck ran perfectly. It’s a great reminder that while the PCM is often the final fix, always check your main power and grounds first!
Is Your Truck Showing Signs of PCM Failure?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, it might be time to replace your PCM:
- ✔ Persistent Check Engine Light (CEL) with various codes, especially communication or internal processor codes.
- ✔ Unexplained drop in fuel efficiency.
- ✔ Rough or erratic engine idling.
- ✔ Harsh or delayed transmission shifting.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Complete no-start or no-spark condition.
- ✔ Inconsistent or non-functional gauges on the instrument cluster.
- ✔ Failure to pass an emissions test.
The Plug-and-Play Solution: A Pre-Programmed 2004-2006 Colorado PCM
Don’t waste time and money at the dealership. We take the hassle out of PCM replacement. When you order from us, we flash the module with the latest GM-certified software updates specifically for your vehicle. All you need to do is provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN) during or after checkout. This ensures that the computer is perfectly matched to your truck’s original factory settings, including engine size, transmission type, and emissions equipment. This critical step guarantees a seamless installation and proper function, eliminating the need for expensive programming tools or a trip to a mechanic for software setup. This is the most reliable way to restore your vehicle’s original performance and efficiency.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and supersedes multiple original part numbers. If your original module has any of the following numbers, this unit is the correct replacement 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.
It is designed to fit the following models:
- Chevrolet Colorado: 2004-2006
- GMC Canyon: 2004-2006
- Hummer H3: 2006
- Buick Rainier: 2006 (4.2L)
- Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L)
- GMC Envoy & Envoy XL: 2006 (4.2L)
- Isuzu Ascender: 2006 (4.2L)
- Isuzu I-280 & I-350: 2006
- Saab 9-7x: 2006 (6 cylinder)
Getting your truck back on the road is simple. Once you install the new 2004-2006 Colorado PCM, you may need to perform a simple security relearn procedure, which can be done without any special tools. This process syncs the new computer with your vehicle’s anti-theft system. Instructions are readily available online or in your vehicle’s service manual. Restore the reliability and drivability of your truck today.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission operation to ensure optimal performance, fuel economy, and emissions.
Do I need to do any programming myself?
No. We handle all the programming for you. Simply provide your VIN at checkout, and the module will arrive ready for installation, flashed with the latest GM software for your specific vehicle.
Where is the PCM located on my 2004-2006 Colorado or Canyon?
On the 2004-2006 Colorado, Canyon, and Hummer H3, the PCM is typically located on the right-hand (passenger side) of the firewall in the engine bay. On Trailblazer/Envoy platforms, it’s on the left-hand (driver side) of the engine.
What is the security relearn procedure?
This is a simple procedure that syncs the new PCM with your vehicle’s anti-theft system. It usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this sequence three times. This allows the components to recognize each other.
How do I provide my VIN?
You can enter your 17-digit Vehicle Identification Number in the notes section during checkout or reply to your order confirmation email with the information. We cannot ship your part until we receive the VIN.
Will this part fix my check engine light?
If the check engine light is caused by an internal failure of the PCM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the vehicle first, as the light could be on for other reasons, such as a faulty sensor or wiring issue.