Restore Your Truck’s Performance and Reliability
Is your 2004-2006 Chevrolet Colorado or GMC Canyon running rough, shifting erratically, or refusing to start? These frustrating and often intermittent issues can frequently be traced back to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions controls. When it begins to fail, it can cause a cascade of problems that are difficult to diagnose and can leave you stranded. This replacement PCM, part number 12606374, is the definitive solution to get your truck back on the road and running like it should.
This isn’t just a part in a box; it’s a complete, plug-and-play solution. We take the guesswork and expensive dealership visits out of the equation. Before this module ships, it is professionally programmed with the latest GM-certified software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This ensures that when the part arrives, it is ready for installation, communicating perfectly with all the other modules and sensors in your truck. This critical programming step is essential for proper function and prevents compatibility issues that can arise from using a generic, unprogrammed unit.
From the Diagnostic Bay
We had a 2005 Colorado in the shop that was a real head-scratcher. The owner complained of random stalling at stoplights and a check engine light that would come and go. We checked the fuel pump, scanned for codes (which were inconsistent), and even replaced the crankshaft position sensor, but the problem persisted. After hours of diagnostics, we hooked up a scope to the injector control circuits and saw the signal dropping out intermittently. The culprit was an internally failing PCM. Once we installed a VIN-programmed module like this one, the truck ran perfectly. It’s a reminder that sometimes the most complex symptoms point back to the vehicle’s brain.
Diagnosing a Faulty 2004-2006 Colorado PCM
A failing engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following symptoms, your PCM could be the root cause. This module is the correct fix for these common issues.
Common Symptoms of PCM Failure
- ✔ Check Engine Light: The light may be on constantly or illuminate intermittently, often with communication-related error codes (U-codes) or performance codes for various sensors.
- ✔ No-Start or Hard Starting: The engine may crank but fail to start, or take an unusually long time to fire up, especially when warm.
- ✔ Poor Engine Performance: You might notice a significant loss of power, hesitation during acceleration, rough idling, or engine stumbling.
- ✔ Reduced Fuel Economy: A faulty PCM can’t efficiently manage the air-fuel mixture, leading to a noticeable drop in your miles per gallon (MPG).
- ✔ Erratic Transmission Shifting: The PCM controls transmission shift points. A failing module can cause harsh shifts, delayed shifting, or getting stuck in one gear (limp mode).
- ✔ Intermittent Stalling: The engine may stall for no apparent reason, either while driving or when coming to a stop.
- ✔ Communication Issues: Your mechanic’s scan tool may be unable to communicate with the PCM, which is a definitive sign of a major internal fault.
Guaranteed Fitment and Compatibility
This Powertrain Control Module is a direct replacement for a wide range of GM trucks and SUVs from the mid-2000s. It is compatible with numerous original part numbers, ensuring a perfect match for your vehicle’s factory specifications. Please verify your part number against the list below or contact us with your VIN to confirm fitment.
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.
Fits Models Including: 2004-2006 Chevrolet Colorado, 2004-2006 GMC Canyon, 2006 Hummer H3, 2006 Buick Rainier 4.2L, 2006 Chevrolet Trailblazer 4.2L, 2006 GMC Envoy 4.2L, and more. Installation is straightforward for a knowledgeable DIYer or any professional technician. Simply disconnect the battery, locate the module on the RH firewall (for Colorado/Canyon/H3) or LH engine area (for Trailblazer/Envoy family), unplug the old unit, install the new one, and reconnect the battery. In most cases, no further procedures are needed.
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
No. This module comes fully programmed to your vehicle’s specific VIN. It is ready for installation right out of the box. You will need to provide your VIN to us after purchase so we can perform this service before shipping.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can find it on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
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. It’s important to have your vehicle properly diagnosed to ensure the PCM is the source of the problem, as other failing sensors can also trigger the light.
Is any other relearn procedure required after installation?
In some cases, a security relearn or CASE (Crankshaft Variation) relearn may be necessary. The security relearn can often be done without special tools by cycling the key. The CASE relearn requires a high-end scan tool and is recommended for optimal performance but may not be required for the vehicle to run.
Does this module fit vehicles other than the Colorado?
Yes. This PCM is compatible with a wide range of GM vehicles, including the GMC Canyon, Hummer H3, Chevy Trailblazer, GMC Envoy, Buick Rainier, Isuzu Ascender, and Saab 9-7X from specific years and with specific engines. Please check the detailed fitment list on this page.