2004-2006 Colorado PCM Powertrain Control Module 12604438

Is Your Truck Running Rough? Restore Its Brainpower.

If you’re dealing with a persistent check engine light, stalling, poor fuel mileage, or erratic shifting in your 2004-2006 Chevrolet Colorado or GMC Canyon, the problem often lies with a failing Powertrain Control Module (PCM). The PCM is the central computer, the brain that manages everything from fuel injection and spark timing to transmission shifts and emissions controls. When it starts to fail, it can cause a cascade of frustrating and hard-to-diagnose issues, leaving your reliable truck feeling anything but.

This isn’t just a replacement part; it’s a complete solution. We take a genuine GM module and program it specifically to your truck’s unique Vehicle Identification Number (VIN). This critical step ensures that the computer has the correct software and calibrations for your specific engine, transmission, and factory options. We also load the latest software updates from General Motors, which can resolve common drivability problems and improve overall performance and efficiency. Stop chasing symptoms and address the root cause with a module that’s ready to install right out of the box.

Common Symptoms of a Failing PCM

• ✔ Check Engine Light: The light stays on, often with communication-related codes (like U0100) or multiple, seemingly unrelated sensor codes.
• ✔ Engine Performance Issues: You may experience random misfires, rough idling, stumbling on acceleration, or a noticeable loss of power.
• ✔ No-Start Condition: The engine will crank over but refuses to start, often due to a lack of fuel injector pulse or spark command from the PCM.
• ✔ Transmission Problems: The automatic transmission may shift harshly, get stuck in one gear (limp mode), or shift at the wrong times.
• ✔ Poor Fuel Economy: A faulty PCM can’t efficiently manage the engine’s fuel delivery, leading to a significant drop in MPG.
• ✔ Failed Emissions Test: Incorrect air/fuel calculations or non-functional monitors will cause your vehicle to fail a smog inspection.

The Right Solution: A Programmed 2004-2006 Colorado PCM

Choosing the right replacement is crucial. A generic, unprogrammed module from a parts store or salvage yard simply won’t work. It needs to be coded to your vehicle’s VIN to communicate with the other modules, like the Body Control Module (BCM) and the anti-theft system. Our service eliminates that hassle. By providing your VIN during checkout, you receive a unit that is a direct fit, both physically and electronically. This 2004-2006 Colorado PCM is prepared to restore your vehicle’s factory performance and reliability.

Simple Installation Process

While professional installation is always an option, many DIY-savvy owners can replace this module. The key is to perform the security relearn procedure after the physical swap.

1. Disconnect the Battery: Always disconnect the negative battery terminal first for safety.
2. Locate and Remove Old PCM: On Colorado/Canyon/H3 models, it’s typically on the right-hand (passenger side) firewall. On Trailblazer/Envoy/Rainier models, it’s on the left-hand (driver side) of the engine. Unplug the electrical connectors and unbolt the module.
3. Install New PCM: Bolt the new, pre-programmed module in place and securely reconnect the wiring harnesses.
4. Reconnect Battery: Reattach the negative battery terminal.
5. Perform Security Relearn: This is a mandatory step. The most common procedure is the “10-Minute Relearn.” Attempt to start the engine; it will crank but not run. Leave the key in the “ON” position for 10 minutes, until the security light on the dash stops flashing and turns off. Turn the key off for 5 seconds, then the vehicle should start and run normally.

Broad Vehicle Compatibility

This module is a direct replacement for a wide range of GM trucks and SUVs. Please verify your vehicle is on the list below. This unit replaces multiple original part numbers, including: 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.

• CHEVROLET COLORADO: 2004-2006 (RH firewall)
• GMC CANYON: 2004-2006 (RH firewall)
• HUMMER H3: 2006 (RH firewall)
• CHEVROLET TRAILBLAZER & TRAILBLAZER EXT: 2006 (4.2L, LH engine)
• GMC ENVOY & ENVOY XL: 2006 (4.2L, LH engine)
• BUICK RAINIER: 2006 (4.2L, LH engine)
• ISUZU ASCENDER: 2006 (4.2L, LH engine)
• ISUZU I-280: 2006 (RH firewall)
• ISUZU I-350: 2006 (RH firewall)
• SAAB 9-7X: 2006 (6 cylinder, LH engine)