Is Your Truck Running Rough? Restore Its Performance and Reliability.
If your 2004-2006 GMC Canyon or Chevrolet Colorado is experiencing frustrating issues like a persistent check engine light, erratic idling, stalling, or a complete no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shifting and emissions control. When it fails, the symptoms can be widespread and difficult to diagnose, leaving you stranded and facing costly repair bills.
This is a direct-fit replacement PCM, part number 12596783, designed to restore your vehicle’s factory performance. The most critical part of the replacement process is programming, and we take care of that for you. Before we ship your module, we flash it with the latest GM-certified software updates specifically matched to your truck’s Vehicle Identification Number (VIN). This ensures seamless integration with your vehicle’s existing systems, eliminating the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2005 Colorado come into the shop that had its owner completely stumped. He’d replaced the throttle body, mass airflow sensor, and all four O2 sensors chasing a stubborn P0171 (System Too Lean) code and a high, surging idle. The truck would barely run. After confirming fuel pressure and checking for vacuum leaks, we hooked up our high-level scanner and tried to communicate with the PCM. The data stream was slow and dropping packets. We knew right away the processor was failing. We installed one of our VIN-programmed modules, performed the 10-minute security relearn, and the truck fired up and idled perfectly. It was a classic case of a failing computer mimicking sensor issues, costing the owner hundreds in unnecessary parts before finding the real solution.
Diagnosing a Faulty 2004-2006 Canyon PCM
A failing computer can manifest in numerous ways, often mimicking other component failures. If you’ve been chasing ghosts in your electrical system or replacing sensors with no improvement, it’s time to consider the PCM. This module is the solution for a wide range of drivability problems and electronic glitches.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The light is on with various trouble codes, especially communication-related codes (U-codes) or internal processor fault codes (P06xx series).
- ✔ No Start or Hard Start: The engine cranks but refuses to start, or takes an excessively long time to fire up.
- ✔ Poor Engine Performance: You may experience a noticeable loss of power, hesitation during acceleration, and decreased fuel economy.
- ✔ Erratic Shifting or Transmission Issues: The PCM also controls transmission functions, so a failure can lead to harsh shifts, getting stuck in a gear, or incorrect shift points.
- ✔ Stalling and Rough Idle: The engine may stall unexpectedly at stops or idle erratically, surging up and down.
- ✔ Failure to Communicate: Your OBD-II scan tool may be unable to connect with the vehicle’s computer.
Plug-and-Play Solution with VIN Programming
The key to a successful PCM replacement is the software. This isn’t a generic, one-size-fits-all part. Your truck’s VIN is tied to specific calibrations for its engine, transmission, emissions equipment, and even tire size. Our process is simple: you provide your VIN during checkout, and our technicians program this module to your exact vehicle specifications. This makes installation as straightforward as possible. In most cases, you will only need to perform a simple security relearn procedure after installation, which can be done in your driveway without any special tools.
This Module is a Direct Replacement For The Following 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
Broad Compatibility Across GM Platforms:
While this is a perfect fit for the 2004-2006 Canyon and Colorado, it also fits a range of other GM vehicles. Please verify your part number and check the fitment list below:
- 2004-2006 GMC Canyon (RH firewall)
- 2004-2006 Chevrolet Colorado (RH firewall)
- 2006 Buick Rainier (4.2L, LH engine)
- 2006 Hummer H3 (RH firewall)
- 2006 Isuzu Ascender (4.2L, LH engine)
- 2006 Isuzu I-280 / I-350 (RH firewall)
- 2006 Chevrolet Trailblazer & Trailblazer EXT (4.2L, LH engine)
- 2006 GMC Envoy & Envoy XL (4.2L, LH engine)
- 2006 Saab 9-7X (6 cylinder, LH engine)
Frequently Asked Questions
Do I need to have this PCM programmed?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN when you place your order, and the module will arrive ready for installation.
Where is the PCM located on my 2004-2006 Canyon?
The PCM is located in the engine bay, typically mounted to the right-hand (passenger side) of the firewall. It will have several large electrical connectors attached to it.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s always best to have your vehicle properly diagnosed to ensure the PCM is the root cause of the problem.
What is a security relearn procedure?
This is a simple procedure that syncs the new PCM with your vehicle’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. We can provide detailed instructions upon request.
Is this a new or used part?
This is a high-quality, tested replacement part that has been meticulously inspected and prepared to meet or exceed original equipment specifications. It is programmed with the latest software for optimal performance.