Restore Your Truck’s Brain and Get Back on the Road
If your 2004-2006 Chevrolet Colorado or GMC Canyon is suffering from mysterious electrical gremlins, poor fuel economy, a persistent check engine light, or just isn’t running like it used to, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just a replacement part; it’s a direct solution, delivered to your door ready to install.
We take the guesswork and hassle out of the repair. Each module is professionally flashed with the latest GM-certified software updates, specifically matched to your vehicle using its unique VIN. This critical step ensures all systems communicate correctly, restoring factory performance and often correcting underlying software bugs that existed from the original build. Simply provide your VIN after purchase, and we handle the complex programming for you.
Case Study: A Tricky Diagnosis
A customer brought in a 2005 Hummer H3 with a complaint of intermittent stalling at stoplights and a transmission that seemed to hunt for gears. No specific transmission codes were present, only a generic P0606 (PCM Processor Fault). After verifying all power and ground circuits to the module were solid—a crucial first step I’ve learned after years of diagnostics—we suspected an internal PCM failure. Swapping in one of our pre-programmed modules not only cleared the P0606 code but instantly smoothed out the idle and corrected the shifting behavior. The original PCM’s internal processor was failing under load, a common issue in these units after years of heat cycles.
Is Your Truck Exhibiting These Telltale Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Unexplained Check Engine Light with codes like P0601, P0602, P0606, or U-series communication codes.
- ✔ Rough or unstable engine idle.
- ✔ Noticeable decrease in fuel mileage.
- ✔ The engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Intermittent stalling for no apparent reason.
Straightforward Installation Guide for Your GM Truck
Replacing the 2004-2006 Colorado PCM is a job most DIYers can handle with basic tools. Follow these steps for a successful installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system to fully discharge.
- Locate the PCM: On the Colorado, Canyon, and H3, the PCM is typically located on the right-hand (passenger side) firewall in the engine bay. On Trailblazer/Envoy platforms, it’s on the left-hand (driver side) of the engine.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. There are usually a few 10mm bolts holding it in place.
- Install the New Module: Seat your new, pre-programmed PCM onto the bracket and secure it with the mounting bolts.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Step: In some cases, a security relearn procedure may be necessary. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine.
Verified Fitment Across GM & Isuzu Platforms
This module is a direct replacement for a wide range of vehicles and part numbers, ensuring compatibility. Please verify your vehicle is on this list before ordering. 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) – Electronic Control Module; (RH firewall)
- GMC Canyon (2004-2006) – Electronic Control Module; (RH firewall)
- Hummer H3 (2006) – Electronic Control Module; (RH firewall)
- Buick Rainier (2006) – Electronic Control Module; (LH engine), 4.2L
- Chevrolet Trailblazer / EXT (2006) – Electronic Control Module; (LH engine), 4.2L
- GMC Envoy / XL (2006) – Electronic Control Module; 4.2L (LH engine)
- Isuzu Ascender (2006) – Electronic Control Module; 4.2L (LH engine)
- Isuzu I-280 (2006) – Electronic Control Module; (RH firewall)
- Isuzu I-350 (2006) – Electronic Control Module; (RH firewall)
- Saab 9-7X (2006) – Electronic Control Module; (LH engine), 6 cylinder
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations specific to your truck’s engine, transmission, and factory options. This ensures seamless integration and proper function without a trip to the dealer.
Is this a simple plug-and-play installation?
Yes, for most vehicles on the fitment list. Because we program it beforehand, you can typically install it yourself with basic hand tools. In some cases, a simple key-cycle security relearn procedure is required, which you can do at home.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (e.g., codes P0601, P0606), then yes, this part will resolve the issue. However, it will not fix problems caused by other faulty sensors or components on the vehicle.
What happens if I don’t provide a VIN?
We cannot ship the module without a VIN. The programming is essential for the part to function in your vehicle. The order will be held until the VIN is provided.
Is this part compatible with other part numbers?
Yes. This module is a verified replacement for a long list of GM part numbers, including 12588650, 12593532, and 12606399, among many others listed above. This ensures you get the right component for the job.