Is Your Truck Running Rough? It Could Be The PCM.
If you’re dealing with a frustrating check engine light, erratic engine behavior, poor fuel economy, or even a no-start condition in your 2004-2006 GMC Canyon or Chevy Colorado, a failing Powertrain Control Module (PCM) is a very likely 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 controls. When it begins to fail, it can cause a cascade of confusing and difficult-to-diagnose problems that can leave you stranded.
Don’t let a faulty computer keep your reliable truck off the road. This replacement Powertrain Control Module, part number 12604438, is the direct solution to restore your vehicle’s original performance and reliability. We take the guesswork out of the repair by pre-programming the module specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures that all factory settings, engine parameters, and security information are correctly loaded, making for a much simpler installation process.
From the Diagnostic Bay
We had a 2005 Colorado in the shop that was driving the owner crazy. It had a persistent, random misfire on cylinder 3 that would come and go. He had already replaced the spark plug, ignition coil, and even the fuel injector, but the P0303 code kept coming back. After hours of checking wiring and sensors, we hooked up our diagnostic scope to the injector driver circuit directly at the PCM. We found that the signal from the PCM to the injector was dropping out intermittently. We installed one of our VIN-programmed PCMs, performed a quick crankshaft position sensor relearn, and the misfire was gone for good. It’s a classic case where the root cause wasn’t a mechanical part, but the computer controlling it.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or erratic idling.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Complete no-start or intermittent starting issues.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Right Solution: A VIN-Programmed 2004-2006 Canyon PCM
Replacing a PCM isn’t as simple as swapping a battery. Modern vehicles have complex anti-theft systems (like GM’s Passlock) that are tied to the PCM. Our service eliminates the need for expensive dealership programming or specialized tools. When you order, simply provide us with your truck’s VIN. Our technicians will flash the module with the latest GM-certified software updates specific to your vehicle. This ensures it communicates perfectly with your engine, transmission, and all other onboard systems right out of the box. This is a direct-fit, reliable solution to get your truck running smoothly again.
Wide Compatibility and Interchangeability
This module is a direct replacement for a wide range of GM trucks and SUVs from this era. It is compatible with the following vehicles and part numbers, ensuring you get the correct component for your repair.
Compatible Vehicles:
- GMC CANYON 2004-2006 (RH firewall)
- CHEVROLET COLORADO 2004-2006 (RH firewall)
- HUMMER H3 2006 (RH firewall)
- BUICK RAINIER 2006 (4.2L, LH engine)
- GMC ENVOY / ENVOY XL 2006 (4.2L, LH engine)
- CHEVROLET TRAILBLAZER / TRAILBLAZER EXT 2006 (4.2L, LH engine)
- ISUZU ASCENDER 2006 (4.2L, LH engine)
- ISUZU I-280 / I-350 2006 (RH firewall)
- SAAB 9-7X 2006 (6 cylinder, LH engine)
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
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
No! We program the module to your vehicle’s VIN before shipping. In most cases, it is a plug-and-play installation. However, you may need to perform a simple security relearn procedure and/or a crankshaft position sensor (CASE) relearn, which can often be done without special tools. Instructions are widely available for these procedures.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side dashboard, visible through the windshield.
Is this a new or used part?
This is a high-quality, tested, and verified genuine OEM component. Each unit is inspected and programmed with the latest software to ensure it meets or exceeds original factory specifications for performance and longevity.
What if I order the wrong part?
By providing your VIN during checkout, we can verify the exact fitment for your vehicle. This helps prevent incorrect orders. If you have any doubts, please contact us with your VIN before purchasing, and our experts will confirm compatibility.
Where is the PCM located on my 2005 GMC Canyon?
On the 2004-2006 GMC Canyon and Chevy Colorado, the PCM (or ECM) is typically located on the right-hand (passenger) side of the firewall in the engine bay.