Is Your Truck Running Rough? Restore Its Power and Reliability.
If your 2004, 2005, or 2006 Chevrolet Colorado or GMC Canyon is experiencing frustrating issues like stalling, poor fuel economy, a persistent check engine light, or a complete no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, the symptoms can be widespread and difficult to diagnose, leaving you stranded and facing a costly repair bill at the dealership.
This replacement PCM, part number 12591647, is the definitive solution to get your truck back on the road. We take the guesswork and high cost out of the equation. Before we ship the module, our technicians will program it with the latest official GM software updates, specifically calibrated to your truck’s unique Vehicle Identification Number (VIN). This ensures that when you receive it, the module is ready for a straightforward installation, eliminating the need for expensive scan tools or a trip to the dealer for programming.
From the Diagnostic Bay
We once had a 2005 GMC Canyon in the shop that was driving the owner crazy. It had a random misfire (P0300 code) that wouldn’t go away. The owner had already replaced all the spark plugs, ignition coils, and even the fuel injectors. The truck would run fine for a day, then start sputtering again. After hours of checking wiring and sensors, we hooked up a scope to the injector control signals coming from the PCM. We found that the signal for cylinder 3 was intermittently dropping out completely. A new, properly programmed PCM fixed the issue instantly. It’s a classic case of how a faulty module can mimic other component failures, costing you time and money on parts you didn’t need.
Symptoms of a Failing 2004-2006 Colorado PCM
A failing engine computer can manifest in numerous ways. If you’re noticing any of the following, it’s a strong indicator that your PCM may need replacement:
- ✔ Check Engine Light is on with various trouble codes (DTCs), especially those related to internal module failure, sensor circuits, or communication errors (U-codes).
- ✔ Your vehicle fails to start or starts and then immediately stalls.
- ✔ Noticeable decrease in fuel efficiency for no apparent reason.
- ✔ Rough or erratic engine idling and stumbling during acceleration.
- ✔ The transmission shifts harshly, gets stuck in a gear, or seems to shift at the wrong times.
- ✔ The cooling fans run constantly or not at all, leading to overheating issues.
- ✔ Loss of communication with your OBD-II scan tool.
Plug-and-Play Solution, Programmed to Your VIN
Don’t settle for a generic module that requires additional programming. Our process is simple and effective. After placing your order, simply provide us with your vehicle’s VIN. We handle the rest. This critical programming step ensures that the PCM correctly communicates with your truck’s engine, transmission, anti-theft system (Passlock), and all other onboard modules. This is a direct-fit replacement for a wide range of original equipment part numbers, including 12569773, 12588650, 12591648, 12606399, and many more, making it a versatile solution for numerous GM vehicles.
Broad Compatibility Across GM Platforms
While this is a core part for the Chevy Colorado and GMC Canyon, this versatile electronic control module also serves as the brain for several other GM vehicles. This unit is the correct fit for the following models:
- 2004-2006 Chevrolet Colorado (RH firewall)
- 2004-2006 GMC Canyon (RH firewall)
- 2006 Hummer H3 (RH firewall)
- 2006 Isuzu i-280 & i-350 (RH firewall)
- 2006 Buick Rainier (4.2L, LH engine)
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L, LH engine)
- 2006 GMC Envoy & Envoy XL (4.2L, LH engine)
- 2006 Isuzu Ascender (4.2L, LH engine)
- 2006 Saab 9-7x (6 cylinder, LH engine)
By ordering this module, you are getting a reliable, fully tested component that is ready to restore your vehicle’s original performance and functionality. Take control of your repair and avoid unnecessary dealership costs.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it. This means it arrives ready for installation, saving you a trip to the dealership and their associated programming fees.
Where is the PCM located on my 2005 Chevy Colorado?
On the 2004-2006 Colorado, Canyon, and Hummer H3, the PCM is located in the engine bay, mounted to the firewall on the right-hand (passenger) side.
What is a VIN and why do you need it?
The VIN, or Vehicle Identification Number, is a unique 17-digit code for your specific truck. It contains information about the engine, transmission, body style, and factory options. We use the VIN to load the exact correct software and calibrations for your vehicle, ensuring perfect compatibility.
Will I need to perform any other procedures after installation?
In many cases, the vehicle will start and run perfectly after installation. However, some GM vehicles may require a simple, key-on/key-off security relearn procedure that you can do yourself in your driveway. Instructions are readily available online, and it requires no special tools.
How can I be sure my old PCM is the problem?
The best way is through professional diagnosis. However, common indicators include multiple unrelated error codes, no communication with a scan tool, or having ruled out all other possible causes (like sensors, wiring, or fuel delivery) for your running issues.
This part number is different from my original. Will it work?
Yes. Part number 12591647 is an approved service replacement for a long list of earlier part numbers. Automotive manufacturers often supersede old part numbers with newer, updated versions. This module is the correct replacement for all the part numbers listed in the description.