Is your GMC Canyon or Chevy Colorado suddenly running rough, stalling, or flashing a persistent Check Engine Light? You’re not just dealing with an annoyance; you’re facing a loss of reliability and the nagging worry of a potential breakdown. The Powertrain Control Module (PCM) is the brain of your truck’s engine and transmission, and when it falters, the entire vehicle suffers. This isn’t just a part—it’s the key to restoring the smooth, dependable performance you count on for work, family, and adventure.
We take the guesswork and dealer-level expense out of the equation. This replacement PCM is meticulously programmed with the latest GM software updates, specifically matched to your vehicle’s unique VIN. This means no complicated trips to a shop for programming. It’s a direct-fit, plug-and-play solution designed to get you back on the road with confidence and peace of mind. Regain control and enjoy that worry-free drive once again.
Warning Signs and How to Overcome Them
A failing PCM can manifest in confusing ways. If you’re experiencing any of the following, this module is the definitive solution:
- ✔ Unexplained Check Engine Light with codes like P0601, P0602, P0604, or P0606.
- ✔ Rough or erratic engine idling.
- ✔ Stalling or hesitation during acceleration.
- ✔ Poor fuel economy that has gotten progressively worse.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ The engine cranks but refuses to start, even with a good battery and starter.
- ✔ Failure to pass an emissions or smog test.
Guided Installation to Restore Your Truck’s Health
Replacing the PCM is a straightforward process you can do right in your driveway. Follow these simple steps to get your truck running right.
- Safety First: Begin by disconnecting the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On your Canyon, Colorado, or H3, the PCM is typically located on the right-hand (passenger side) of the firewall in the engine bay.
- Disconnect the Harnesses: Carefully unlatch and disconnect the electrical connectors from the old module. They have locking tabs, so be gentle to avoid damage.
- Remove the Old PCM: Unbolt the old module from its mounting bracket. It’s usually held in by a few small bolts.
- Install the New Unit: Mount your new, pre-programmed PCM onto the bracket and secure it with the bolts.
- Reconnect Everything: Firmly plug the electrical connectors back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle needs to sync with the new PCM. This is a simple key-cycling procedure: Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this two more times. On the fourth try, the truck should start and run perfectly.
From the Mechanic’s Bay: The Phantom Misfire
“A customer brought in his ’05 Colorado with a persistent, random misfire that no one could solve. He’d replaced plugs, coils, and even injectors. The truck ran fine for a while, then would start sputtering at a stoplight. After hooking up our diagnostic tools, we saw the injector pulse width was erratic on one cylinder, but only intermittently. It wasn’t the injector itself; the command from the PCM was faulty. We installed a VIN-programmed module, and the problem vanished instantly. It’s a powerful reminder that sometimes the issue lies with the brain, not the body.”
Tailored Fit for Your Ride
This 2004-2006 Canyon PCM is a direct replacement for a wide range of GM trucks and SUVs, ensuring perfect compatibility. Please verify your vehicle is on the list below.
- CANYON: 2004-2006 (Electronic Control Module; RH firewall)
- COLORADO: 2004-2006 (Electronic Control Module; RH firewall)
- HUMMER H3: 2006 (Electronic Control Module; RH firewall)
- ISUZU I-280: 2006 (Electronic Control Module; RH firewall)
- ISUZU I-350: 2006 (Electronic Control Module; RH firewall)
- RAINIER: 2006 (Electronic Control Module; LH engine, 4.2L)
- TRAILBLAZER / TRAILBLAZER EXT: 2006 (Electronic Control Module; LH engine, 4.2L)
- ENVOY / ENVOY XL: 2006 (Electronic Control Module; 4.2L, LH engine)
- ISUZU ASCENDER: 2006 (Electronic Control Module; 4.2L, LH engine)
- SAAB 9-7X: 2006 (Electronic Control Module; LH engine, 6 cylinder)
This module 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.
Your Questions, Answered
Frequently Asked Questions
Is this 2004-2006 Canyon PCM really ready to install out of the box?
Yes. Once you provide us with your vehicle’s VIN during checkout, we program the module with the latest GM software specific to your truck. The only additional step you’ll need to perform is the simple security relearn procedure, which involves cycling the key and takes about 30 minutes.
What is the security relearn procedure you mentioned?
It’s a process that allows your vehicle’s anti-theft system to recognize the new PCM. You simply turn the key to the ‘ON’ position for 10-15 minutes until the security light goes out, then turn it ‘OFF’ for 10 seconds. You repeat this cycle three times. On the next attempt, the vehicle will start and run normally. No special tools are required.
Where is the PCM located on my 2005 GMC Canyon?
For the 2004-2006 Canyon, Colorado, and Hummer H3, the PCM is mounted to the firewall on the passenger side of the engine compartment. It’s a silver metal box with several large electrical connectors.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine functions and transmission shift points. If your module has failed, it can cause erratic shifting, delayed engagement, or other transmission issues. This programmed replacement restores those factory-correct commands.
Do I need to send my old computer back for a core charge?
This listing does not require a core return. You can keep your old part or dispose of it responsibly.