2004-2006 Colorado PCM 12606399 | VIN Programmed for Easy Install

Restore Your Truck’s Brain and Get Back on the Road with Confidence

Is your Chevrolet Colorado or GMC Canyon running rough, throwing confusing check engine lights, or refusing to start? A faulty Powertrain Control Module (PCM) is often the hidden culprit behind these frustrating and unpredictable issues. It’s the central computer of your vehicle, and when it fails, it can feel like you’re chasing ghosts. This replacement PCM, part number 12606399, is the definitive solution to restore your truck’s performance, reliability, and your peace of mind. We take the guesswork out of the repair by programming the module to your vehicle’s specific VIN before we ship it, ensuring a straightforward installation process.

Warning Signs and How to Overcome Them

A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, this module is the reliable fix you need:

• ✔ Unexplained Check Engine Light with codes like P0601, P0602, P0606, or other communication errors.
• ✔ Rough or erratic idling and stalling.
• ✔ A sudden drop in fuel economy.
• ✔ Harsh or incorrect shifting from the automatic transmission.
• ✔ The engine cranks but refuses to start.
• ✔ Other modules (like the TCM or BCM) cannot communicate with the PCM.

An Expert’s Tale: The Diagnostic Dead End

“I once worked with a customer who had replaced nearly every sensor on his ’05 Canyon—crank sensor, cam sensor, O2 sensors—trying to solve a persistent stalling issue. The truck would run fine for days, then die at a stoplight without warning. His frustration was palpable. After confirming all his new parts were working, we finally tested the PCM’s driver circuits. The issue was internal to the module itself. We installed a VIN-programmed unit just like this one, and the truck ran perfectly. It was a powerful reminder that sometimes the problem lies with the commander, not the soldiers.”- Senior ASE Certified Technician

Guided Installation to Restore Peak Performance

Replacing your 2004-2006 Colorado PCM is a manageable job for a DIYer with basic tools. Follow these steps for a successful installation and get back to a worry-free drive.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work. This prevents accidental shorts and protects the vehicle’s sensitive electronics.
2. Locate the Module: On the Colorado and Canyon, the PCM is typically located on the right-hand (passenger side) of the firewall in the engine bay.
3. Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket and remove it from the vehicle.
4. Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts. Reconnect the electrical harnesses, ensuring they click firmly into place.
5. Reconnect Power: Reattach the negative battery terminal and tighten it.
6. Perform Security Relearn: Your vehicle may require a simple security relearn procedure to recognize the new module. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the BCM and new PCM to synchronize. Consult your owner’s manual for the exact procedure for your vehicle.

Tailored Fit for Your Ride

This module is a direct-fit replacement for a wide range of GM trucks and SUVs, ensuring perfect compatibility. Please verify your vehicle is on the list below:

• COLORADO 2004-2006 (Electronic Control Module; RH firewall)
• CANYON 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)
• ENVOY 2006 (Electronic Control Module; 4.2L, LH engine)
• ENVOY XL 2006 (Electronic Control Module; 4.2L, LH engine)
• RAINIER 2006 (Electronic Control Module; 4.2L, LH engine)
• TRAILBLAZER 2006 (Electronic Control Module; 4.2L, LH engine)
• TRAILBLAZER EXT 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; 6 cylinder, LH engine)

This unit 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.

Don’t let a faulty computer keep you off the road. Ordering this pre-programmed 2004-2006 Colorado PCM is the most reliable and efficient way to solve complex electronic issues and restore your truck to its prime.