Is Your 2004-2006 GMC Canyon Running Rough?
If your GMC Canyon or a compatible GM truck is experiencing baffling issues like stalling, poor fuel economy, erratic shifting, or a persistent Check Engine Light, the problem may lie with its central nervous system: the Powertrain Control Module (PCM). The PCM, also known as the Electronic Control Module (ECM), is the master computer responsible for managing everything from fuel injection and ignition timing to transmission shifts and emissions controls. When it fails, it can cause a cascade of problems that are often difficult to diagnose, leading to frustration and costly, ineffective repairs.
Don’t let a faulty computer keep your reliable truck off the road. This is a direct-fit replacement Powertrain Control Module for your vehicle, identified by part number 12589585 and its many interchanges. We take the guesswork out of the repair by programming the module specifically for your truck using your Vehicle Identification Number (VIN). This ensures that all factory settings, security information, and operational parameters are perfectly matched, just as they were when your vehicle left the assembly line.
From the Diagnostic Bay
We had a 2005 Chevy Colorado come into the shop that was driving the owner crazy. It would randomly stall at stoplights, and the transmission would sometimes refuse to shift out of second gear. He had already replaced the throttle body and a couple of sensors with no luck. After hooking up our diagnostic scanner, we noticed communication dropouts with the main computer. We checked the wiring and connectors, which were all solid. The culprit was a failing 2004-2006 Canyon PCM (the same unit used in the Colorado). The internal processor was failing under heat, causing these intermittent, ghost-like problems. Once we installed a VIN-programmed replacement module, the truck ran perfectly. It’s a classic example of how a failing PCM can mimic a dozen other mechanical issues.
Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light: The most common sign, often with codes related to module communication errors (U-codes) or multiple, unrelated sensor faults.
- ✔ Engine Stalling or Misfiring: The engine may stall for no apparent reason, either while driving or at idle. You might also experience rough idling or misfires.
- ✔ Poor Fuel Economy: A failing PCM can’t properly manage the air-fuel mixture, leading to a noticeable drop in MPG.
- ✔ Transmission Shifting Problems: Harsh shifting, delayed engagement, or getting stuck in a single gear can be caused by the PCM’s inability to communicate with the transmission controller.
- ✔ No-Start Condition: In severe cases, the PCM can fail completely, preventing the engine from starting at all. The starter may crank, but there will be no spark or fuel.
- ✔ Failed Emissions Test: Incorrect engine management will almost certainly lead to a failed smog or emissions inspection.
Why Choose Our Pre-Programmed 2004-2006 Canyon PCM?
Getting your truck back to factory-spec performance is our priority. Unlike a generic module from a parts store or a used unit from a salvage yard, our PCM comes ready for installation. Here’s what sets our service apart:
- VIN-Specific Programming: We flash the module with the latest GM-certified software calibration for your exact VIN. This is not a one-size-fits-all solution; it’s tailored to your truck’s specific engine, transmission, and options.
- Plug-and-Play Installation: Because the module is programmed before it ships, the installation process is straightforward. In most cases, you can simply disconnect the battery, swap the modules, and reconnect the battery. A security relearn procedure may be required, which is a simple process you can do yourself in about 15 minutes.
- Broad Compatibility: This module, part number 12589585, is a direct replacement for a wide range of part numbers and fits numerous GM vehicles, including the Chevrolet Colorado, Hummer H3, Isuzu Ascender, GMC Envoy, and more. Please see the full fitment list below.
Guaranteed Fitment For The Following Vehicles:
This module is a confirmed fit for the following vehicles, serving as a replacement for numerous original part numbers including 12569773, 12588650, 12591647, 12606399, and many others listed in the original description.
- 2004-2006 GMC Canyon (RH firewall)
- 2004-2006 Chevrolet Colorado (RH firewall)
- 2006 Hummer H3 (RH firewall)
- 2006 Buick Rainier (4.2L, LH engine)
- 2006 GMC Envoy, Envoy XL (4.2L, LH engine)
- 2006 Chevrolet Trailblazer, Trailblazer EXT (4.2L, LH engine)
- 2006 Isuzu Ascender (4.2L, LH engine)
- 2006 Isuzu i-280 & i-350 (RH firewall)
- 2006 Saab 9-7x (6 cylinder, LH engine)
Restore the reliability and performance of your truck with a properly functioning, correctly programmed 2004-2006 Canyon PCM. Provide your VIN at checkout and let us handle the complex programming so you can get back on the road with confidence.
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or need to send your original module to us. This is a replacement part that we program and ship directly to you.
What is VIN programming?
VIN programming is the process of loading your vehicle’s specific software and security information onto the module. This ensures it communicates perfectly with all other systems in your truck, just like the original factory unit. We require your VIN to perform this essential service before shipping.
Is this part difficult to install?
The physical installation is straightforward for anyone with basic mechanical skills. It typically involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. After installing the new one, you may need to perform a simple security relearn procedure, which does not require special tools. Instructions are readily available online.
Will this fix my specific problem?
This module will correct issues directly caused by a faulty PCM. While the symptoms listed are common indicators of PCM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the root cause before ordering.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit VIN. We cannot program and ship your module until we receive this information.