Is Your 2004-2006 Colorado or Canyon Plagued with Mysterious Issues?
If you’re dealing with a frustrating no-start condition, a rough or surging idle, erratic shifting, or a check engine light that won’t go away no matter what parts you throw at it, the root cause is often the Powertrain Control Module (PCM). As the central computer for your engine and transmission, when the PCM starts to fail, it can create a cascade of confusing symptoms that can be a nightmare to diagnose.
A Real-World Diagnostic Scenario
A customer’s 2005 Hummer H3 came into my shop last month with these exact symptoms. It had a persistent P0300 (Random Misfire) code and would occasionally stall at red lights. The owner had already replaced the spark plugs, ignition coils, and even the fuel pump with no success. After hooking up my scan tool, I noticed the fuel trim data was completely erratic, and the PCM would intermittently lose communication. This pointed directly to an internal failure of the computer itself, a common issue I’ve seen on hundreds of these GM trucks and SUVs. The constant heat cycles and vibration from its location on the firewall eventually take their toll on the sensitive internal electronics.
The Direct-Fit, Programmed Solution
This isn’t just a replacement part; it’s a complete, ready-to-install solution for your vehicle. We take a fully tested and verified Electronic Control Module and flash it with the latest, most current GM-certified software specifically for your truck. Here’s what that means for you:
- VIN-Specific Programming: You provide us with your Vehicle Identification Number (VIN) during checkout. We use that to load the precise calibration for your truck’s engine, transmission, and emissions equipment.
- Includes Factory Updates: Your new PCM will include all official drivability and performance updates released by GM since your truck was new. This can solve inherent issues like harsh shifting or idle instability that were present from the factory.
- No Dealer Visit Required: Because the module arrives programmed, you avoid the time, hassle, and high cost of having a dealership perform the flashing.
Installation and Getting Back on the Road
Installation is straightforward for a DIY mechanic. The PCM is typically located on the right-hand (passenger side) firewall on the Colorado, Canyon, and H3. After disconnecting the battery, you simply unbolt the old module, carefully disconnect the wiring harnesses, and install the new one in its place. In most cases, you will need to perform a security relearn procedure (often called GM Passlock relearn) which takes about 30 minutes and requires only your ignition key. This syncs the new PCM to your vehicle’s anti-theft system.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles that use this hardware platform. It correctly replaces the following part numbers and fits the listed models:
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
Fits Vehicles Including:
- 2004-2006 Chevrolet Colorado
- 2004-2006 GMC Canyon
- 2006 Hummer H3
- 2006 Isuzu I-280 & I-350
- 2006 Buick Rainier (4.2L)
- 2006 Chevrolet Trailblazer / EXT (4.2L)
- 2006 GMC Envoy / XL (4.2L)
- 2006 Isuzu Ascender (4.2L)
- 2006 Saab 9-7X (6 cylinder)