Restore Peak Performance to Your GM Truck or SUV
Is your 2004-2006 GMC Canyon, Chevy Colorado, or Hummer H3 suffering from perplexing issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. Don’t let a faulty module keep you off the road. This direct-fit replacement PCM, part number 19209821, is the reliable solution to get your vehicle running like new again.
This isn’t just a generic part off the shelf. We take the guesswork out of the repair by programming the module specifically for your vehicle using your VIN. This ensures that all communications between the engine, transmission, and other vehicle systems are perfectly synchronized. It arrives at your door loaded with the latest factory software updates from GM, often correcting underlying drivability issues you may not have even known were software-related. This plug-and-play convenience saves you a costly trip to the dealership for programming, getting you back on the road faster.
From the Diagnostic Bay
We had a 2005 Chevy Colorado come into the shop with an intermittent stalling problem that was driving the owner crazy. It would die at stoplights randomly, with no check engine light and no stored codes. We checked fuel pressure, ignition components, and sensors, but everything tested fine. After exhausting the usual suspects, we monitored the PCM’s data stream and noticed the processor would occasionally drop communication for a split second—just long enough to stall the engine. We installed one of these VIN-programmed PCMs, performed the security relearn, and the truck has been running perfectly ever since. It’s a reminder that sometimes the ‘brain’ itself is the source of the most elusive problems.
Is a Failing 2004-2006 Canyon PCM Causing Your Problems?
The PCM is the master controller for your vehicle’s most critical functions. When it begins to fail, it can manifest in a wide variety of symptoms that can often be misdiagnosed as other component failures. Before you start replacing expensive sensors or transmission parts, check if your vehicle is exhibiting any of the following common signs of a bad PCM.
Common Symptoms of a Faulty PCM:
- ✔ Check Engine Light: The light may be on constantly or intermittently, often with communication-related error codes (U-codes) or performance codes for multiple, unrelated sensors.
- ✔ Engine Performance Issues: You might experience rough idling, stalling, hesitation during acceleration, engine misfires, or a noticeable decrease in power.
- ✔ Poor Fuel Economy: A failing PCM can’t properly calculate the air-fuel mixture, leading to a sudden and unexplained drop in your MPG.
- ✔ Transmission Shifting Problems: The PCM also controls transmission shift points. You may notice harsh shifting, delayed engagement, or the transmission getting stuck in one gear (limp mode).
- ✔ No-Start Condition: In severe cases, the PCM can fail completely, preventing the engine from starting at all. The engine may crank but will not fire up because the PCM isn’t commanding the fuel injectors or ignition coils.
- ✔ Failed Emissions Test: An improperly functioning PCM will prevent the vehicle’s readiness monitors from setting, resulting in an automatic failure of most state emissions inspections.
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for a wide range of original equipment part numbers, ensuring a perfect fit and function for your vehicle. It is compatible with the following vehicles:
- GMC Canyon: 2004-2006
- Chevrolet Colorado: 2004-2006
- Hummer H3: 2006
- GMC Envoy & Envoy XL: 2006 (4.2L)
- Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L)
- Buick Rainier: 2006 (4.2L)
- Isuzu Ascender: 2006 (4.2L)
- Isuzu i-280 & i-350: 2006
- Saab 9-7x: 2006 (6-cylinder)
This unit replaces 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, and 19209821.
Frequently Asked Questions
Do I need to program this module?
No. This is the biggest benefit of our service. We program the module with the latest GM software using the VIN you provide during checkout. It arrives ready for installation, saving you a trip to the dealer.
What is a VIN and why do you need it?
The Vehicle Identification Number (VIN) is a unique 17-digit code for your specific vehicle. It contains information about the make, model, year, engine, transmission, and other factory-installed options. Providing your VIN is essential for us to load the exact correct software for your vehicle’s configuration.
Will this fix my check engine light?
If the PCM is the root cause of the fault codes triggering your check engine light, then yes, this will resolve the issue. However, it’s crucial to ensure your vehicle has been properly diagnosed, as the light could be on for other reasons, such as a bad sensor or wiring issue.
Is the installation difficult?
For most DIYers, the physical installation is straightforward. The module is typically located on the right-hand firewall. It 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 (often called a CASE relearn), which can be done without special tools and instructions are readily available online.
Does this fit models other than the GMC Canyon?
Yes, absolutely. This PCM is a common module used across many GM mid-size trucks and SUVs from this era, including the Chevrolet Colorado, Hummer H3, GMC Envoy, and Chevrolet Trailblazer, among others listed in the description.